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<!-- Module User's Guide -->

<chapter>
	
	<title>&adminguide;</title>
	
	<section>
	<title>Overview</title>
	<para>
	Kamailio can behave as a stateful proxy through the TM module.  However, 
	"stateful" in this context refers to <emphasis>transaction</emphasis> 
	state, not dialog state.  Certain applications benefit from the proxy's
	awareness of "calls", not just SIP transactions.
	</para>
	<para>For example, a common need is to limit the number of calls that can 
	be made concurrently by an endpoint, account, user group, etc.  In order 
	to count the number of calls in progress, it is necessary for the proxy 
	to be aware of whole dialogs, not just transactions, and to provide some 
	means of programmatically classifying these dialogs.  This is just one 
	common application discussed for illustrative purposes; there are many others.  
	</para>
	<para>
	The dialog module provides dialog awareness for the &kamailio; proxy. Its
	functionality is to keep track of the current dialogs, to offer information
	about them (e.g. how many dialogs are active), and to manage various 
	characteristics of dialogs. The module exports several functions that could be 
	used directly from the configuration route script.
	</para>
	<para>
	This module also provides a foundational API on which to build 
	more complex dialog-oriented functionality in other &kamailio; modules.
	</para>
	</section>

	<section>
	<title>How it works</title>
	<para>
	To create the dialog associated with an initial request, the flag
	<quote>dlg_flag</quote> (<xref linkend="dlg-flag-id"/>) must be set before
	creating the corresponding transaction.
	</para>
	<para>
	The dialog is automatically destroyed when a <quote>BYE</quote> is
	received. In case of no <quote>BYE</quote>, the dialog lifetime is
	controlled via the default timeout (see <quote>default_timeout</quote>
	- <xref linkend="default-timeout-id"/>) and custom timeout (see
	<quote>timeout_avp</quote> - <xref linkend="timeout-avp-id"/>). The
	dialog timeout is reset each time a sequential request is processed.
	</para>
	</section>
	<section>
	<title>Dialog states</title>
	<para>
	Dialogs have states that are shown in the RPC interface as well as stored
	in the database. 
	</para>
	<itemizedlist>
		<listitem>
			<para><emphasis>1</emphasis> : Unconfirmed dialog</para>
		</listitem>
		<listitem>
			<para><emphasis>2</emphasis> : Early dialog (ringing)</para>
		</listitem>
		<listitem>
			<para><emphasis>3</emphasis> : Confirmed dialog (waiting for ACK)</para>
		</listitem>
		<listitem>
			<para><emphasis>4</emphasis> : Confirmed dialog (active call)</para>
		</listitem>
		<listitem>
			<para><emphasis>5</emphasis> : Deleted dialog</para>
		</listitem>
	</itemizedlist>
	</section>

	<section>
	<title>Dialog profiling</title>
	<para>
	Dialog profiling is a mechanism that helps in classifying, sorting and
	keeping track of certain types of dialogs.  The classification criteria
	can be any attributes desired by the user;  they can come from SIP message
	attributes, other pseudo-variables, custom values, etc.  
	Dialogs can be dynamically added into one or more profile
	tables.  Logically, each profile table can have a special meaning (like
	dialogs outside the domain, dialogs terminated to the PSTN, etc.).
	</para>
	<para>
	There are two types of profiles:
	<itemizedlist>
		<listitem>
		<para>
			<emphasis>with no value</emphasis> - a dialog simply belongs
			to a profile (for instance, an outbound calls profile). There is 
			no other additional information to describe the dialog beyond 
			its membership in the profile per se.
		</para>
		</listitem>
		<listitem>
		<para>
			<emphasis>with value</emphasis> - a dialog belongs to a profile
			having a certain value (like in a caller profile, where the value
			is the caller ID). The membership of the dialog in the profile is
			strictly related to the value.  For example, if the account ID
			of the caller is stored in the pseudo-variable $var(account_id),
			you can use $var(account_id) as a value/key by which to group 
			dialogs so that you can count the number of open dialogs for
			each account, enforce concurrent call limits as necessary, etc.
		</para>
		</listitem>
	</itemizedlist>
	</para>
	<para>
	A dialog can be added to multiple profiles at the same time.
	</para>
	<para>
	Profiles are visible (at the moment) in the request route (for initial
	and sequential requests) and in the branch, failure and reply routes of
	the original request.
	</para>
	</section>

	<section>
	<title>Dependencies</title>
	<section>
		<title>&kamailio; Modules</title>
		<para>
		The following modules must be loaded before this module:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>TM</emphasis> - Transaction module
			</para>
			</listitem>
			<listitem>
			<para>
				<emphasis>RR</emphasis> - Record-Route module
			</para>
			</listitem>
			<listitem>
			<para>
				<emphasis>PV</emphasis> - Pseudovariables module
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>


	<section>
		<title>External Libraries or Applications</title>
		<para>
		The following libraries or applications must be installed before
		running &kamailio; with this module loaded:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>None</emphasis>.
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	</section>


	<section>
	<title>Parameters</title>
	<section>
		<title><varname>enable_stats</varname> (integer)</title>
		<para>
		If statistics support should be enabled or not. Via statistics
		variables, the module provide information about the dialog processing.
		Set it to zero to disable or to non-zero to enable it.
		</para>
		<para>
		<emphasis>
			Default value is <quote>1 (enabled)</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>enable_stats</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "enable_stats", 0)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>hash_size</varname> (integer)</title>
		<para>
		The size of the hash table internally used to keep the dialogs. A
		larger table is much faster but consumes more memory. The hash size
		must be a power of two.
		</para>
		<para>
		IMPORTANT: If dialogs' information should be stored in a database,
		a constant hash_size should be used, otherwise the restoring process
		will not take place. If you really want to modify the hash_size, you
		must delete all table's rows before restarting the server.
		</para>
		<para>
		<emphasis>
			Default value is <quote>4096</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>hash_size</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "hash_size", 1024)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>rr_param</varname> (string)</title>
		<para>
		Name of the Record-Route parameter used to store the dialog cookie.
		It is used for the fast matching of sequential requests to tracked
		dialogs.
		</para>
		<para>
		<emphasis>
			Default value is <quote>did</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>rr_param</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "rr_param", "xyz")
...
</programlisting>
		</example>
	</section>

	<section id="dlg-flag-id">
		<title><varname>dlg_flag</varname> (integer)</title>
		<para>
		Flag to be used for marking if a dialog should be constructed for the
		current request (this make sense only for initial requests).
		</para>
		<para>
		<emphasis>
			Default value is <quote>none</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>dlg_flag</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "dlg_flag", 4)
...
</programlisting>
		</example>
	</section>

	<section id="timeout-avp-id">
		<title><varname>timeout_avp</varname> (string)</title>
		<para>
		The specification of an AVP that contains a custom timeout value (in seconds)
		for the dialog. It may be used only in a request (initial or sequential)
		context.
		</para>
		<para>
		<emphasis>
			Default value is <quote>none</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>timeout_avp</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "timeout_avp", "$avp(i:10)")
...
</programlisting>
		</example>
	</section>

	<section id="default-timeout-id">
		<title><varname>default_timeout</varname> (integer)</title>
		<para>
		The default dialog timeout (in seconds), in the absence of a custom
		value provided in an AVP.
		</para>
		<para>
		<emphasis>
			Default value is <quote>43200 (12 hours)</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>default_timeout</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "default_timeout", 21600)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>dlg_extra_hdrs</varname> (string)</title>
		<para>
		A string containing the extra headers (full format, with EOH)
		to be added to requests generated locally by the module (like BYEs).
		</para>
		<para>
		<emphasis>
			Default value is <quote>NULL</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>dlf_extra_hdrs</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "dlg_extra_hdrs", "Hint: credit expired\r\n")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>dlg_match_mode</varname> (integer)</title>
		<para>
		How the sequential requests should be matched against the known dialogs.
		The modes are a combination of matching based on a cookie (DID)
		stored as cookie in Record-Route header and matching based on SIP
		elements (as in RFC 3261).
		</para>
		<para>
		Note: DID-based matching does not replace callid/fromtag/totag comparison. It will speed
		up dialog matching by not iterating over the whole dialog list for callid/fromtag/totag comparison, but
		instead it uses a hash table to find the respective dialog and then doing only one callid/fromtag/totag 
		comparison. Thus, there is no security 
		issue when using DID based matching. Use DID_FALLBACK for maximum interoperability or use DID_ONLY to
		reject buggy clients or hacking attempts. DID_NONE is only useful, when you want to hide dialog-tracking
		from the users (preventing the DID Record-Route cookie).
		</para>
		<para>
		The supported modes are:
		</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>0 - DID_ONLY</emphasis> - the match is done
				exclusively based on DID;
			</para></listitem>
			<listitem><para>
				<emphasis>1 - DID_FALLBACK</emphasis> - the match is first
				tried based on DID and if not present, it will fall back to
				SIP matching;
			</para></listitem>
			<listitem><para>
				<emphasis>2 - DID_NONE</emphasis> - the match is done
				exclusively based on SIP elements; no DID information is added
				in RR.
			</para></listitem>
		</itemizedlist>
		<para>
		<emphasis>
			Default value is <quote>0 (DID_ONLY)</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>dlg_match_mode</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "dlg_match_mode", 1)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>detect_spirals</varname> (integer)</title>
		<para>
			Whether spirals (i.e., messages routed through the proxy multiple times)
			should be detected.
		</para>
		<para>
			If set to 0, spirals will not be detected and result in the generation of a
			new, possibly dangling dialog structure per occurring spiral. If set to 1,
			spirals are detected and internally mapped to existing dialog structures.
		</para>
		<para>
			Default value is 1.
		</para>
		<example>
			<title>Set <varname>detect_spirals</varname> parameter</title>
			<programlisting format="linespecific">
...
modparam("dialog", "detect_spirals", 1)
...
			</programlisting>
		</example>
	</section>

	<section>
		<title><varname>db_url</varname> (string)</title>
		<para>
		If you want to store the information about the dialogs in a database,
		a database URL must be specified.
		</para>
		<para>
		<emphasis>
			Default value is <quote>&defaultdb;</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>db_url</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "db_url", "&exampledb;")
...
</programlisting>
		</example>
	</section>

<section>
		<title><varname>db_mode</varname> (integer)</title>
		<para>
		Mode of synchronisation of dialog information from memory to an
		underlying database (if desired):
		</para>
		<para>
		The supported modes are:
		</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>0 - NO_DB</emphasis> - the memory content is not
				flushed into DB;
			</para></listitem>
			<listitem><para>
				<emphasis>1 - REALTIME</emphasis> - any dialog information
				changes will be reflected into the database immediatly.
			</para></listitem>
			<listitem><para>
				<emphasis>2 - DELAYED</emphasis> - the dialog information
				changes will be flushed into DB periodically, based on a
				timer routine.
			</para></listitem>
			<listitem><para>
				<emphasis>3 - SHUTDOWN</emphasis> - the dialog information
				will be flushed into DB only at shutdown - no runtime updates.
			</para></listitem>
		</itemizedlist>
		<para>
		<emphasis>
			Default value is <quote>0</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>db_mode</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "db_mode", 1)
...
</programlisting>
		</example>
	</section>

<section>
		<title><varname>db_update_period</varname> (integer)</title>
		<para>
			The interval (seconds) at which to update dialogs' information, if you chose to store the dialogs' info at a given interval.
			Too short an interval will generate intensive database operations, while an excessively long one will miss dialogs with a short lifetime.
		</para>
		<para>
		<emphasis>
			Default value is <quote>60</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>db_update_period</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "db_update_period", 120)
...
</programlisting>
		</example>
	</section>

<section>
		<title><varname>db_fetch_rows</varname> (integer)</title>
		<para>
			The number of the rows to be fetched at once from database when loading the dialog records at startup from the database.
			This value can be used to tune the load time at startup. For 1MB of private memory (default), it should be below 400.
			The database driver must support the fetch_result() capability. A value of 0 means the database fetch is not limited.
		</para>
		<para>
		<emphasis>
			Default value is <quote>200</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>db_fetch_rows</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "db_fetch_rows", 500)
...
</programlisting>
		</example>
	</section>

<section>
		<title><varname>db_skip_load</varname> (integer)</title>
		<para>
			Set db_skip_load to 1, to skip the loading of dialogs from the database alltogether.
		</para>
		<para>
		<emphasis>
			Default value is <quote>0</quote> ( not skipped ).
		</emphasis>
		</para>
		<example>
		<title>Set <varname>db_skip_load</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "db_skip_load", 1)
...
</programlisting>
		</example>
	</section>



	<section>
		<title><varname>table_name</varname> (string)</title>
		<para>
		If you want to store the information about the dialogs in a
		database a table name must be specified.
		</para>
		<para>
		<emphasis>
			Default value is <quote>dialog</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>table_name</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "table_name", "my_dialog")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>call_id_column</varname> (string)</title>
		<para>
			The column name in the database to store the dialogs' callid.
		</para>
		<para>
		<emphasis>
			Default value is <quote>callid</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>callid_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "call_id_column", "callid_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>from_uri_column</varname> (string)</title>
		<para>
			The column name in the database to store the caller's
			sip address.
		</para>
		<para>
		<emphasis>
			Default value is <quote>from_uri</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>from_uri_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "from_uri_column", "from_uri_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>from_tag_column</varname> (string)</title>
		<para>
			The column name in the database to store the From tag from
			the INVITE request.
		</para>
		<para>
		<emphasis>
			Default value is <quote>from_tag</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>from_tag_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "from_tag_column", "from_tag_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>to_uri_column</varname> (string)</title>
		<para>
			The column name in the database to store the callee's sip address.
		</para>
		<para>
		<emphasis>
			Default value is <quote>to_uri</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>to_uri_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "to_uri_column", "to_uri_c_name")
...
</programlisting>
		</example>
	</section>


	<section>
		<title><varname>to_tag_column</varname> (string)</title>
		<para>
			The column name in the database to store the To tag from
			the 200 OK response to the INVITE request, if present.
		</para>
		<para>
		<emphasis>
			Default value is <quote>to_tag</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>to_tag_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "to_tag_column", "to_tag_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>from_cseq_column</varname> (string)</title>
		<para>
			The column name in the database to store the cseq from caller
			side.
		</para>
		<para>
		<emphasis>
			Default value is <quote>caller_cseq</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>from_cseq_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "from_cseq_column", "column_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>to_cseq_column</varname> (string)</title>
		<para>
			The column name in the database to store the cseq from callee
			side.
		</para>
		<para>
		<emphasis>
			Default value is <quote>callee_cseq</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>to_cseq_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "to_cseq_column", "column_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>from_route_column</varname> (string)</title>
		<para>
			The column name in the database to store the route records from
			caller side (proxy to caller).
		</para>
		<para>
		<emphasis>
			Default value is <quote>caller_route_set</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>from_route_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "from_route_column", "column_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>to_route_column</varname> (string)</title>
		<para>
			The column name in the database to store the route records from
			callee side (proxy to callee).
		</para>
		<para>
		<emphasis>
			Default value is <quote>callee_route_set</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>to_route_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "to_route_column", "column_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>from_contact_column</varname> (string)</title>
		<para>
			The column name in the database to store the caller's contact
			uri.
		</para>
		<para>
		<emphasis>
			Default value is <quote>caller_contact</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>from_contact_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "from_contact_column", "column_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>to_contact_column</varname> (string)</title>
		<para>
			The column name in the database to store the callee's contact
			uri.
		</para>
		<para>
		<emphasis>
			Default value is <quote>callee_contact</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>to_contact_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "to_contact_column", "column_name")
...
</programlisting>
		</example>
	</section>

<section>
		<title><varname>from_sock_column</varname> (string)</title>
		<para>
			The column name in the database to store the information about
			the local interface receiving the traffic from caller.
		</para>
		<para>
		<emphasis>
			Default value is <quote>caller_sock</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>from_sock_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "from_sock_column", "column_name")
...
</programlisting>
		</example>
	</section>

<section>
		<title><varname>to_sock_column</varname> (string)</title>
		<para>
			The column name in the database to store information about the
			local interface receiving the traffic from callee.
		</para>
		<para>
		<emphasis>
			Default value is <quote>callee_sock</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>to_sock_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "to_sock_column", "column_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>h_id_column</varname> (string)</title>
		<para>
			The column name in the database to store the dialogs'
			hash id information.
		</para>
		<para>
		<emphasis>
			Default value is <quote>hash_id</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>h_id_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "h_id_column", "hash_id_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>h_entry_column</varname> (string)</title>
		<para>
			The column name in the database to store the dialogs' hash
			entry information.
		</para>
		<para>
		<emphasis>
			Default value is <quote>hash_entry</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>h_entry_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "h_entry_column", "h_entry_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>state_column</varname> (string)</title>
		<para>
			The column name in the database to store the
			dialogs' state information.
		</para>
		<para>
		<emphasis>
			Default value is <quote>state</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>state_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "state_column", "state_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>start_time_column</varname> (string)</title>
		<para>
			The column name in the database to store the
			dialogs' start time information.
		</para>
		<para>
		<emphasis>
			Default value is <quote>start_time</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>start_time_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "start_time_column", "start_time_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>timeout_column</varname> (string)</title>
		<para>
			The column name in the database to store the dialogs' timeout.
		</para>
		<para>
		<emphasis>
			Default value is <quote>timeout</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>timeout_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "timeout_column", "timeout_c_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>sflags_column</varname> (string)</title>
		<para>
			The column name in the database to store the script flags.
		</para>
		<para>
		<emphasis>
			Default value is <quote>sflags</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>sflags_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "sflags_column", "s_flags")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>toroute_column</varname> (string)</title>
		<para>
			The column name in the database to store the index of the
			route to be executed at timeout.
		</para>
		<para>
		<emphasis>
			Default value is <quote>toroute_name</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>toroute_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "toroute_column", "timeout_route")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>vars_table_name</varname> (string)</title>
		<para>
		If you want to store the variables for a dialog in a
		database a table name must be specified.
		</para>
		<para>
		<emphasis>
			Default value is <quote>dialog_vars</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>vars_table_name</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "vars_table_name", "my_dialog_vars")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>vars_h_id_column</varname> (string)</title>
		<para>
			The column name in the database to store the dialogs'
			hash id information (as a reference to the dialog table).
		</para>
		<para>
		<emphasis>
			Default value is <quote>hash_id</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>vars_h_id_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "vars_h_id_column", "vars_h_id_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>vars_h_entry_column</varname> (string)</title>
		<para>
			The column name in the database to store the dialogs'
			hash entry information (as a reference to the dialog table).
		</para>
		<para>
		<emphasis>
			Default value is <quote>hash_entry</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>vars_h_entry_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "vars_h_entry_column", "vars_h_entry_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>vars_key_column</varname> (string)</title>
		<para>
			The column name in the database to store the keys of a variable.
		</para>
		<para>
		<emphasis>
			Default value is <quote>dialog_key</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>vars_key_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "vars_key_column", "vars_key_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>vars_value_column</varname> (string)</title>
		<para>
			The column name in the database to store the keys of a variable.
		</para>
		<para>
		<emphasis>
			Default value is <quote>dialog_value</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>vars_value_column</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "vars_value_column", "vars_value_name")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>profiles_with_value</varname> (string)</title>
		<para>
			List of names for profiles with values.
		</para>
		<para>
		<emphasis>
			Default value is <quote>empty</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>profiles_with_value</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "profiles_with_value", "caller ; my_profile")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>profiles_no_value</varname> (string)</title>
		<para>
			List of names for profiles without values.
		</para>
		<para>
		<emphasis>
			Default value is <quote>empty</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>profiles_no_value</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "profiles_no_value", "inbound ; outbound")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>bridge_controller</varname> (string)</title>
		<para>
			SIP address to be used in From header when initiating a call bridge.
		</para>
		<para>
		<emphasis>
			Default value is <quote>sip:controller@kamailio.org</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>bridge_controller</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "bridge_controller", "sip:ctd@kamailio.org")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>bridge_contact</varname> (string)</title>
		<para>
			SIP address to be used in Contact header when doing a call bridge.
		</para>
		<para>
		<emphasis>
			Default value is <quote>sip:controller@kamailio.org:5060</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>bridge_contact</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "bridge_contact", "sip:ctd@127.0.0.1:5060")
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>initial_cbs_inscript</varname> (int)</title>
		<para>
            If the initial dialog callbacks (i.e., DLGCB_CREATED and
            DLGCB_SPIRALED) should be executed in-script or post-script.
            If dlg_manage() is not used, the setting of this parameter does
            not matter; otherwise, initial callbacks will be executed
            directly after dlg_manage() is called if this parameter is
            enabled. If it is disabled, initial callback execution will be
            postponed until configuration script execution completes.
		</para>
		<para>
		The supported values are:
		</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>0 - POST-SCRIPT</emphasis> - execute initial
				callbacks after the script completes;
			</para></listitem>
			<listitem><para>
				<emphasis>1 - IN-SCRIPT</emphasis> - execute initial
                callbacks during script execution, i.e., right after
                dlg_manage() is called;
			</para></listitem>
		</itemizedlist>
		<para>
		<emphasis>
			Default value is <quote>1</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>initial_cbs_inscript</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "initial_cbs_inscript", 0)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>send_bye</varname> (int)</title>
		<para>
			If set to 1, BYE requests will be sent out for each dialog that
			timed out. It is an alternative to $dlg_ctx(timeout_bye)=1 for
			all dialogs.
		</para>
		<para>
		<emphasis>
			Default value is <quote>0</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>send_bye</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "send_bye", 1)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>wait_ack</varname> (int)</title>
		<para>
			If set to 1, dialog will be keept a bit longer in memory
			in order to absorb the ACK negative replies of initial
			INVITE. If not, the dialog is destroyed when negative reply
			is sent out (less internal complexity).
		</para>
		<para>
		<emphasis>
			Default value is <quote>1</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>wait_ack</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "wait_ack", 0)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>ka_timer</varname> (int)</title>
		<para>
			Keep-alive timer step - how often to execute the callback to
			send dialog keep alives (SIP OPTIONS requests within dialog).
			The value represents the number of seconds.
		</para>
		<para>
		<emphasis>
			Default value is <quote>0</quote> (no keep alive).
		</emphasis>
		</para>
		<example>
		<title>Set <varname>ka_timer</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "ka_timer", 10)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>ka_interval</varname> (int)</title>
		<para>
			The interval between keep alives within dialog (SIP OPTIONS
			requests), sent to caller or callee. The keep alive request
			will be sent by the first callback fired by KA timer after
			the ka_interval elapsed from dialog setup or previous keep-alive.
			The value represents the number of seconds.
		</para>
		<para>
			If the requests times out (generating a 408) or if the
			UA responds with 481 the lifetime is set to 10 seconds.
			When lifetime expires the dialog will be terminated.
			Any other response (including error responses) will
			reset the timers.
		</para>
		<para>
		<emphasis>
			Default value is <quote>0</quote> (no keep alive). The lowest
			settable interval is 30 seconds.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>ka_interval</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "ka_interval", 300)
...
</programlisting>
		</example>
	</section>

	<section>
		<title><varname>timeout_noreset</varname> (int)</title>
		<para>
           If set to 1, the dialog timeout won't be reset each
			time a sequential request is processed.
			It is an alternative to dlg_set_property("timeout-noreset") for all dialogs.
		</para>
		<para>
		<emphasis>
			Default value is <quote>0</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>timeout_noreset</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "timeout_noreset", 1)
...
</programlisting>
		</example>
	</section>

	<section id="dialog.p.timer_procs">
		<title><varname>timer_procs</varname> (int)</title>
		<para>
			If set to 1, the dialog will run own timer process to execute
			dialog timeout tasks.
		</para>
		<para>
		<emphasis>
			Default value is <quote>0</quote> (use core time process).
		</emphasis>
		</para>
		<example>
		<title>Set <varname>timer_procs</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "timer_procs", 1)
...
</programlisting>
		</example>
	</section>

	<section id="dialog.p.track_cseq_updates">
		<title><varname>track_cseq_updates</varname> (int)</title>
		<para>
			Enable the callbacks for tracking if CSeq number needs to
			be updated. It is the case when the INVITE has to be
			authenticated to downstream provider using uac_auth() from
			uac module.
		</para>
		<para>
			This is done only for requests in downstream direction. The
			CSeq difference is stored in $dlg_var(cseq_diff), be sure
			this variable is not overwritten via config operation.
		</para>
		<para>
		<emphasis>
			Default value is <quote>0</quote> (disabled).
		</emphasis>
		</para>
		<example>
		<title>Set <varname>track_cseq_updates</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "track_cseq_updates", 1)
...
</programlisting>
		</example>
	</section>

	<section id="dialog.p.lreq_callee_headers">
		<title><varname>lreq_callee_headers</varname> (string)</title>
		<para>
			SIP headers to be added when sending local generated requests
			(e.g., BYE) to callee. It can be useful when you use topoh module
			with call-id masking (see the docs of topoh module).
		</para>
		<para>
		<emphasis>
			Default value is <quote>null</quote>.
		</emphasis>
		</para>
		<example>
		<title>Set <varname>lreq_callee_headers</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("dialog", "lreq_callee_headers", "TH: dlh\r\n")
...
</programlisting>
		</example>
	</section>

	</section>


	<section>
	<title>Functions</title>
	<section>
		<title>
		<function moreinfo="none">set_dlg_profile(profile,[value])</function>
		</title>
		<para>
		Inserts the current dialog into a profile. Note that if the profile does
		not support values, they will be silently discarded. Also, there is
		no check for inserting the same dialog into the same profile multiple
		times.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>profile</emphasis> - name of the profile to be
			added to;
			</para>
		</listitem>
		<listitem>
			<para><emphasis>value</emphasis> (optional) - string value to
			define the membership of the dialog in the profile.  Note that the
			profile must support values.  Pseudo-variables are supported.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, BRANCH_ROUTE,
			REPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>set_dlg_profile</function> usage</title>
		<programlisting format="linespecific">
...
set_dlg_profile("inbound_call");
set_dlg_profile("caller","$fu");
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">unset_dlg_profile(profile,[value])</function>
		</title>
		<para>
		Removes the current dialog from a profile.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>profile</emphasis> - name of the profile to be
			removed from;
			</para>
		</listitem>
		<listitem>
			<para><emphasis>value</emphasis> (optional) - string value to
			define the belonging of the dialog to the profile - note that the
			profile must support values.
			Pseudo-variables are supported.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from BRANCH_ROUTE,
			REPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>unset_dlg_profile</function> usage</title>
		<programlisting format="linespecific">
...
unset_dlg_profile("inbound_call");
unset_dlg_profile("caller","$fu");
...
</programlisting>
		</example>
	</section>


	<section>
		<title>
		<function moreinfo="none">is_in_profile(profile,[value])</function>
		</title>
		<para>
		Checks if the current dialog belongs to a profile. If the profile
		supports values, the check can be reinforced to take into account a
		specific value, if the dialog was inserted into the profile for a
		specific value. If no value is passed, only the membership of
		the dialog in the profile per se is checked. Note that if the profile does
		not support values, the value parameter will be silently discarded.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>profile</emphasis> - name of the profile to be
			checked against;
			</para>
		</listitem>
		<listitem>
			<para><emphasis>value</emphasis> (optional) - string value to
			further restrict the check. Pseudo-variables are supported.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, BRANCH_ROUTE,
			REPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>is_in_profile</function> usage</title>
		<programlisting format="linespecific">
...
if (is_in_profile("inbound_call")) {
	log("this request belongs to a inbound call\n");
}
...
if (is_in_profile("caller","XX")) {
	log("this request belongs to a call of user XX\n");
}
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">get_profile_size(profile,[value],size)</function>
		</title>
		<para>
		Returns the number of dialogs belonging to a profile. If the profile
		supports values, the check can be reinforced to take into account a
		specific value, i.e. how many dialogs were inserted into the profile with
		a specific value. If no value is passed, only the membersip of the
		dialog in the profile per se is checked. Note that if the profile does not
		support values, the value parameter will be silently discarded.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>profile</emphasis> - name of the profile to get
			the size for;
			</para>
		</listitem>
		<listitem>
			<para><emphasis>value</emphasis> (optional) - string value to
			further restrict the check. Pseudo-variables are supported;
			</para>
		</listitem>
		<listitem>
			<para><emphasis>size</emphasis> - an AVP or script variable to
			return the profile size in.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from REQUEST_ROUTE, BRANCH_ROUTE,
			REPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>get_profile_size</function> usage</title>
		<programlisting format="linespecific">
...
if(get_profile_size("inbound_call","$avp(size)"))
    xlog("currently there are $avp(size) inbound calls\n");
...
if(get_profile_size("caller","$fu","$avp(size)"))
    xlog("currently, the user $fu has $avp(size) active outgoing calls\n");
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_isflagset(flag)</function>
		</title>
		<para>
		Check if the dialog flag is set or not.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>flag</emphasis> - index of the flag - can be
				pseudo-variable.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from BRANCH_ROUTE,
			REQUEST_ROUTE, ONREPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>dlg_isflagset</function> usage</title>
		<programlisting format="linespecific">
...
if(dlg_isflagset("1"))
{
    ...
}
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_setflag(flag)</function>
		</title>
		<para>
		Set the dialog flag.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>flag</emphasis> - index of the flag - can be
				pseudo-variable.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from BRANCH_ROUTE,
			REQUEST_ROUTE, ONREPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>dlg_setflag</function> usage</title>
		<programlisting format="linespecific">
...
dlg_setflag("1");
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_resetflag(flag)</function>
		</title>
		<para>
		Reset the dialog flag.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>flag</emphasis> - index of the flag - can be
				pseudo-variable.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from BRANCH_ROUTE,
			REQUEST_ROUTE, ONREPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>dlg_resetflag</function> usage</title>
		<programlisting format="linespecific">
...
redlg_setflag("1");
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_bye(side)</function>
		</title>
		<para>
		Send BYE to both parties of a dialog.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>side</emphasis> - where to send the BYE. It can be:
				'caller', 'callee', or both.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from BRANCH_ROUTE,
			REQUEST_ROUTE, ONREPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>dlg_bye</function> usage</title>
		<programlisting format="linespecific">
...
dlg_bye("all");
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_refer(side, address)</function>
		</title>
		<para>
		Refer the 'side' to a new SIP 'address'.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>side</emphasis> - which side of the dialog to REFER. It can be:
				'caller' or 'callee'.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>address</emphasis> - SIP address to refer to.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from BRANCH_ROUTE,
			REQUEST_ROUTE, ONREPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>dlg_refer</function> usage</title>
		<programlisting format="linespecific">
...
dlg_refer("caller", "sip:announcement@kamailio.org");
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_manage()</function>
		</title>
		<para>
		Process current SIP request with dialog module. It is an alternative to
		setting dialog flag for initial INVITE and Route-parameter-callback
		execution for within-dialog requests.
		</para>
		<para>
		This function can be used from REQUEST_ROUTE.
		</para>
		<example>
		<title><function>dlg_manage</function> usage</title>
		<programlisting format="linespecific">
...
modparam("dialog", "default_timeout", 100)
...
route {
...
    if(is_method("INVITE") &amp;&amp; !has_totag())
    {
        $dlg_ctx(timeout_route) = 12;
        $dlg_ctx(timeout_bye) = 1;
    }
    dlg_manage();
...
}
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_bridge(from, to, op)</function>
		</title>
		<para>
		Bridge 'from' SIP address to 'to' SIP address via outbound proxy 'op'.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>from</emphasis> - SIP address of first side to call.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>to</emphasis> - SIP address to refer <quote>from</quote> to.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>op</emphasis> - outbound proxy SIP address.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from BRANCH_ROUTE,
			REQUEST_ROUTE, ONREPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>dlg_bridge</function> usage</title>
		<programlisting format="linespecific">
...
dlg_bridge("sip:user@kamailio.org", "sip:annoucement@kamailio.org",
   "sip:kamailio.org:5080");
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_get(callid, ftag, ttag)</function>
		</title>
		<para>
			Search and set current dialog based on Call-ID, From-Tag and To-Tag
			parameters.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>callid</emphasis> - SIP call-id.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>ftag</emphasis> - SIP From tag.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>ttag</emphasis> - SIP To tag.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from BRANCH_ROUTE,
			REQUEST_ROUTE, ONREPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>dlg_get</function> usage</title>
		<programlisting format="linespecific">
...
if(dlg_get("abcdef", "123", "456"))
{
	dlg_bye("all");
}
...
</programlisting>
		</example>
	</section>
	
	<section>
		<title>
		<function moreinfo="none">is_known_dlg()</function>
		</title>
		<para>
		This function checks if the current SIP message being processed
		belongs to any transaction within an active dialog that the 
		dialog module is currently tracking.  This is a check for 
		tracking of any kind, without regard to profiles.
		</para>
		<para>
		This function has numerous potential applications, among which
		is that it can be used to strengthen security for 
		loose-routing sequential (in-dialog) requests or responses
		to them, as by providing a preventative check against
		spoofing on the proxy level instead of leaving the issue
		purely to the receiving UA.  
		</para>
		<para>
		This function can be used from REQUEST_ROUTE, BRANCH_ROUTE,
			REPLY_ROUTE and FAILURE_ROUTE.
		</para>
		<example>
		<title><function>is_known_dlg()</function> usage</title>
		<programlisting format="linespecific">
...
if(!uri == myself) {
	if(is_known_dlg()) {
		xlog("Request $rm from $ci is in-dialog\n");
	}
}
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_set_timeout(timeout [, h_entry, h_id])</function>
		</title>
		<para>
			Set the dialog timeout. Dialog timeout will be updated if it was
			already set. If h_entry and h_id parameters are not provided, the
			dialog will be searched based on (callid, fromtag, totag) of
			currently processed SIP message.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>timeout</emphasis> - the interval in seconds after
				which the dialog will time out.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>h_entry</emphasis> - h_entry value of the iternal
				dialog identifier.
			</para>
		</listitem>
		<listitem>
			<para><emphasis>h_id</emphasis> - h_id valye if the internal dialog
				identifier.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>dlg_set_timeout</function> usage</title>
		<programlisting format="linespecific">
...
if(dlg_set_timeout("180", "123", "456"))
{
    ...
}
...
</programlisting>
		</example>
	</section>

	<section>
		<title>
		<function moreinfo="none">dlg_set_timeout_by_profile(profile, [value], timeout)</function>
		</title>
		<para>
			Like <emphasis>dlg_set_timeout()</emphasis>, but 
			simultaneously sets the timeout of all dialogs in
			a given profile.  Can be constrained by profile value.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>profile</emphasis> - The dialog profile across which to apply the timeout.
			</para>
			<para><emphasis>value</emphasis> (optional) - The profile value to use when applying the dialog timeout.
			</para>
			<para><emphasis>timeout</emphasis> - the interval in seconds after
				which the dialog will time out.
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>dlg_set_timeout_by_profile</function> usage</title>
		<programlisting format="linespecific">
...
# All dialogs belonging to user abc123 (tracked via set_dlg_profile()) 
# will be timed out in 3 seconds.

dlg_set_timeout_by_profile("users", "abc123", "3");
...
</programlisting>
		</example>
	</section>


	<section>
		<title>
		<function moreinfo="none">dlg_set_property(attr)</function>
		</title>
		<para>
			Set a dialog property - an attribute that enable/disable
			various behaviours (e.g., sending keep alive requests).
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para><emphasis>attr</emphasis> - name of property. It can be:
				<itemizedlist>
					<listitem>
						'ka-src' - send keep alive OPTION requests to caller
					</listitem>
					<listitem>
						'ka-dst' - send keep alive OPTION requests to callee
					</listitem>
					<listitem>
						'timeout-noreset' - don't reset timeout on in-dialog messages reception
					</listitem>
				</itemizedlist>
			</para>
		</listitem>
		</itemizedlist>
		<para>
			If keep alive is enabled for a dialog, the module will send
			SIP OPTIONS requests with CSeq lower or equal than last request
			within dialog, with the scope of detecting if the destination is
			still in the call. If the keep alive request results in a local
			timeout or '481 Call Leg/Transaction Does Not Exist', then the
            dialog is ended from the server.
		</para>
		<para>
            If 'timeout-noreset' is set, dialog timeout won't be reset upon reception
            of in-dialog messages (default behavior).
		</para>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>dlg_set_property</function> usage</title>
		<programlisting format="linespecific">
...
dlg_set_property("ka-src");
dlg_set_property("ka-dst");
dlg_set_property("timeout-noreset");
...
</programlisting>
		</example>
	</section>

	<section id="dialog.f.dlg_remote_profile">
		<title>
		<function moreinfo="none">dlg_remote_profile(cmd, profile, value, uid, expires)</function>
		</title>
		<para>
			Manage remote profile via config file. A remote profile item is considered when
			the dialog is not managed by this server instance. The notification to add/remove
			can be received via SIP or a RPC command, the operation can be then triggered
			from configuration file. This should allow counting active dialogs in a profile
			that are managed by multiple SIP server instances.
		</para>
		<para>Meaning of the parameters is as follows:</para>
		<itemizedlist>
		<listitem>
			<para>
				<emphasis>cmd</emphasis> - the operations to do: add - add an item in
				profile; rm - remove an item from profile
			</para>
		</listitem>
		<listitem>
			<para>
				<emphasis>profile</emphasis> - name of profile
			</para>
		</listitem>
		<listitem>
			<para>
				<emphasis>value</emphasis> - value for profile (if no value is needed
				for that profile, use an empty string.
			</para>
		</listitem>
		<listitem>
			<para>
				<emphasis>expires</emphasis> - absolute time (unix timestamp) when this
				profile item should be removed automatically (time based),
				if still in the profile
			</para>
		</listitem>
		</itemizedlist>
		<para>
		This function can be used from ANY_ROUTE.
		</para>
		<example>
		<title><function>dlg_remote_profile</function> usage</title>
		<programlisting format="linespecific">
...
$var(exp) = 3600 + $Ts;
dlg_remote_profile("add", "caller", "test", "$sruid", "$var(exp)");
...
</programlisting>
		</example>
	</section>
	</section>


	<section>
	<title>Statistics</title>
		<section>
			<title><varname>active_dialogs</varname></title>
			<para>
			Returns the number of current active dialogs (may be confirmed or
			not).
			</para>
		</section>
		<section>
			<title><varname>early_dialogs</varname></title>
			<para>
			Returns the number of early dialogs.
			</para>
		</section>		<section>
			<title><varname>processed_dialogs</varname></title>
			<para>
			Returns the total number of processed dialogs (terminated,
			expired or active) from the startup.
			</para>
		</section>
		<section>
			<title><varname>expired_dialogs</varname></title>
			<para>
			Returns the total number of expired dialogs from the startup.
			</para>
		</section>
		<section>
			<title><varname>failed_dialogs</varname></title>
			<para>
			Returns the number of failed dialogs.
			</para>
		</section>
	</section>


	<section>
	<title>MI Commands</title>

		<section>
		<title><varname>dlg_list</varname></title>
		<para>
		Lists the description of a dialog or of all dialogs (calls). If only
		one dialogs is to be listed, the dialog identifiers are to be passed
		as parameter (callid and fromtag).
		</para>
		<para>
		Name: <emphasis>dlg_list</emphasis>
		</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>callid</emphasis> (optional) - callid if a single
				dialog to be listed.
			</para></listitem>
			<listitem><para>
				<emphasis>from_tag</emphasis> (optional, but cannot be present
				without the callid parameter) - from tag (as per initial request)
				of the dialog to be listed.  Note that if the from_tag is not
				specified, only dialogs created by a request without a from tag
				are matched, which will only occur with broken clients and is
				thus a very rare situation.
			</para></listitem>
		</itemizedlist>
		<para>
		MI FIFO Command Format:
		</para>
		<programlisting  format="linespecific">
		:dlg_list:_reply_fifo_file_
		_empty_line_
		</programlisting>
		<programlisting  format="linespecific">
		:dlg_list:_reply_fifo_file_
		abcdrssfrs122444@192.168.1.1
		AAdfeEFF33
		</programlisting>
		</section>

		<section>
		<title><varname>dlg_list_ctx</varname></title>
		<para>
		The same as the <quote>dlg_list</quote> but including in the dialog
		description the associated context from modules sitting on top of
		the dialog module.
		</para>
		<para>
		Name: <emphasis>dlg_list_ctx</emphasis>
		</para>
		<para>Parameters: <emphasis>see <quote>dlg_list</quote></emphasis>
		</para>
		<para>
		MI FIFO Command Format:
		</para>
		<programlisting  format="linespecific">
		:dlg_list_ctx:_reply_fifo_file_
		_empty_line_
		</programlisting>
		</section>

		<section>
			<title><varname>dlg_end_dlg</varname></title>
			<para>
			Terminates a confirmed dialog by sending BYE requests in both directions.
			</para>
		<para>
		Name: <emphasis>dlg_end_dlg</emphasis>
		</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>h_entry</emphasis> - hash entry of the dialog in the
				internal dialog table
			</para></listitem>
			<listitem><para>
				<emphasis>h_id</emphasis> - hash id of the dialog on the hash
				entry
			</para></listitem>
			<listitem><para>
				<emphasis>extra_hdrs</emphasis> - (optional) string containg
				extra headers (full format) to be added to the BYE requests.
			</para></listitem>
		</itemizedlist>
		<para>
		The values for the h_entry and h_id can be get via the dlg_list
		MI command.
		</para>
		<para>
		<emphasis>Note: Works only for confirmed dialogs.</emphasis>
		</para>
		<para>
		MI FIFO Command Format:
		</para>
		<programlisting  format="linespecific">
		:dlg_end_dlg:_reply_fifo_file_
		342
		56
		_empty_line_
		</programlisting>
		</section>

		<section>
		<title><varname>dlg_terminate_dlg</varname></title>
		<para>
		Terminates a singe dialog, identified by a Call-ID.
		</para>
		<para>
		Name: <emphasis>dlg_terminate_dlg</emphasis>
		</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>callid</emphasis> - callid of the dialog to be terminated.
			</para></listitem>
			<listitem><para>
				<emphasis>from_tag</emphasis> (optional, but cannot be present
				without the callid parameter) - from tag (as per initial request)
				of the dialog to be terminated.  Note that if the from_tag is not
				specified, only dialogs created by a request without a from tag
				are matched, which will only occur with broken clients and is
				thus a very rare situation.
			</para></listitem>
		</itemizedlist>
		<para>
		<emphasis>Note: Works only for confirmed dialogs.</emphasis>
		</para>
		<para>
		MI FIFO Command Format:
		</para>
		<programlisting  format="linespecific">
		:dlg_terminate_dlg:_reply_fifo_file_
		abcdrssfrs122444@192.168.1.1
		AAdfeEFF33
		</programlisting>
		</section>

		<section>
		<title><varname>profile_get_size</varname></title>
		<para>
		Returns the number of dialogs belonging to a profile. If the profile
		supports values, the check can be reinforced to take into account a
		specific value - how many dialogs were inserted into the profile with
		a specific value. If no value is passed, only the simply belonging of
		the dialog to the profile is checked. Note that if the profile does not
		supports values, this will be silently discarded.
		</para>
		<para>
		Name: <emphasis>profile_get_size</emphasis>
		</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>profile</emphasis> - name of the profile to get the
				value for.
			</para></listitem>
			<listitem><para>
				<emphasis>value</emphasis> (optional)- string value to
				further restrict the check;
			</para></listitem>
		</itemizedlist>
		<para>
		MI FIFO Command Format:
		</para>
		<programlisting  format="linespecific">
		:profile_get_size:_reply_fifo_file_
		inbound_calls
		_empty_line_
		</programlisting>
		</section>

		<section>
		<title><varname>profile_list_dlgs</varname></title>
		<para>
		Lists all the dialogs belonging to a profile. If the profile
		supports values, the check can be reinforced to take into account a
		specific value - list only the dialogs that were inserted into the
		profile with that specific value. If no value is passed, all dialogs
		belonging to the profile will be listed. Note that if the profile does
		not supports values, this will be silently discarded.
		</para>
		<para>
		Name: <emphasis>profile_list_dlgs</emphasis>
		</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>profile</emphasis> - name of the profile to list the
				dialog for.
			</para></listitem>
			<listitem><para>
				<emphasis>value</emphasis> (optional)- string value to
				further restrict the check;
			</para></listitem>
		</itemizedlist>
		<para>
		MI FIFO Command Format:
		</para>
		<programlisting  format="linespecific">
		:profile_list_dlgs:_reply_fifo_file_
		inbound_calls
		_empty_line_
		</programlisting>
		</section>

		<section>
		<title><varname>dlg_bridge</varname></title>
		<para>
			Bridge two SIP addresses in a call using INVITE(hold)-REFER-BYE
			mechanism.
		</para>
		<para>
		Name: <emphasis>dlg_bridge</emphasis>
		</para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>from</emphasis> - SIP address to initiate the call
			</para></listitem>
			<listitem><para>
				<emphasis>to</emphasis> - SIP address to refer 'from' to
			</para></listitem>
			<listitem><para>
				<emphasis>op</emphasis> (optional) - outbound proxy SIP address
			</para></listitem>
		</itemizedlist>
		<para>
		MI FIFO Command Format:
		</para>
		<programlisting  format="linespecific">
		:dlg_bridge:_reply_fifo_file_
		from
		to
		op
		_empty_line_
		</programlisting>
		</section>

	</section>


	<section>
	<title>Exported RPC Functions</title>
		<section>
		<title><varname>dlg.list</varname></title>
		<para>Lists the description of all dialogs (calls). </para>
		<para>Name: <emphasis>dlg.list</emphasis></para>
		<para>RPC Command Format:</para>
		<programlisting  format="linespecific">
		serctl dlg_list
		</programlisting>
		</section>

		<section>
		<title><varname>dlg.list_ctx</varname></title>
		<para>
		The same as the <quote>dlg_list</quote> but including in the dialog
		description the associated context from modules sitting on top of
		the dialog module.
		</para>
		<para>Name: <emphasis>dlg.list_ctx</emphasis></para>
		<para>RPC Command Format:</para>
		<programlisting  format="linespecific">
		serctl dlg.list_ctx
		</programlisting>
		</section>

		<section>
		<title><varname>dlg.dlg_list</varname></title>
		<para>
		Lists the description of one dialog.  The dialog identifiers are to be passed
		as parameter (callid and fromtag).
		</para>
		<para>Name: <emphasis>dlg.dlg_list</emphasis></para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>callid</emphasis> callid of the dialog to be listed.
			</para></listitem>
			<listitem><para>
				<emphasis>from_tag</emphasis> from tag (as per initial request)
				of the dialog to be listed.
			</para></listitem>
		</itemizedlist>
		<para>RPC Command Format:</para>
		<programlisting  format="linespecific">
		serctl dlg.list abcdrssfrs122444@192.168.1.1 AAdfeEFF33
		</programlisting>
		</section>

		<section>
		<title><varname>dlg.dlg_list_ctx</varname></title>
		<para>
		The same as the <quote>dlg.list_ctx</quote> but including in the dialog
		description the associated context from modules sitting on top of
		the dialog module.
		</para>
		<para>Name: <emphasis>dlg.dlg_list_ctx</emphasis></para>
		<para>Parameters: <emphasis>see <quote>dlg_list</quote></emphasis>
		</para>
		<para>RPC Command Format:</para>
		<programlisting  format="linespecific">
		serctl dlg.list_ctx abcdrssfrs122444@192.168.1.1 AAdfeEFF33
		</programlisting>
		</section>

		<section>
			<title><varname>dlg.end_dlg</varname></title>
			<para>
			Terminates an ongoing dialog by sending BYE in both directions.
			</para>
		<para>Name: <emphasis>dlg.end_dlg</emphasis></para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>h_entry</emphasis> - hash entry of the dialog in the
				internal dialog table
			</para></listitem>
			<listitem><para>
				<emphasis>h_id</emphasis> - hash id of the dialog on the hash
				entry
			</para></listitem>
			<listitem><para>
				<emphasis>extra_hdrs</emphasis> - (optional) string containg
				extra headers (full format) to be added to the BYE requests.
			</para></listitem>
		</itemizedlist>
		<para>
		The values for the h_entry and h_id can be get via the dlg_list
		RPC command.
		</para>
		<para>RPC Command Format:</para>
		<programlisting  format="linespecific">
		serctl dlg.end_dlg 342 56
		</programlisting>
		</section>

		<section>
		<title><varname>dlg.profile_get_size</varname></title>
		<para>
		Returns the number of dialogs belonging to a profile. If the profile
		supports values, the check can be reinforced to take into account a
		specific value - how many dialogs were inserted into the profile with
		a specific value. If no value is passed, only the simply belonging of
		the dialog to the profile is checked. Note that if the profile does not
		support values, the value parameter will be silently discarded.
		</para>
		<para>Name: <emphasis>dlg.profile_get_size</emphasis></para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>profile</emphasis> - name of the profile to get the
				value for.
			</para></listitem>
			<listitem><para>
				<emphasis>value</emphasis> (optional)- string value to
				further restrict the check;
			</para></listitem>
		</itemizedlist>
		<para>RPC Command Format:</para>
		<programlisting  format="linespecific">
		serctl dlg.dlg.profile_get_size inbound_calls
		</programlisting>
		</section>

		<section>
		<title><varname>dlg.profile_list</varname></title>
		<para>
		Lists all the dialogs belonging to a profile. If the profile
		supports values, the check can be reinforced to take into account a
		specific value, i.e. list only the dialogs that were inserted into the
		profile with that specific value. If no value is passed, all dialogs
		belonging to the profile will be listed. Note that if the profile does
		not supports values, this will be silently discarded.
		</para>
		<para>Name: <emphasis>dlg.profile_list</emphasis></para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>profile</emphasis> - name of the profile to list the
				dialog for.
			</para></listitem>
			<listitem><para>
				<emphasis>value</emphasis> (optional)- string value to
				further restrict the check;
			</para></listitem>
		</itemizedlist>
		<para>RPC Command Format:</para>
		<programlisting  format="linespecific">
		serctl dlg.profile_list inbound_calls
		</programlisting>
		</section>

		<section>
		<title><varname>dlg.bridge_dlg</varname></title>
		<para>
			Bridge two SIP addresses into a call using INVITE(hold)-REFER-BYE
			mechanism.
		</para>
		<para>Name: <emphasis>dlg.bridge_dlg</emphasis></para>
		<para>Parameters:</para>
		<itemizedlist>
			<listitem><para>
				<emphasis>from</emphasis> - SIP address to initiate the call
			</para></listitem>
			<listitem><para>
				<emphasis>to</emphasis> - SIP address to refer 'from' to
			</para></listitem>
			<listitem><para>
				<emphasis>op</emphasis> (optional) - outbound proxy SIP address
			</para></listitem>
		</itemizedlist>
		<para>RPC Command Format:</para>
		<programlisting  format="linespecific">
		serctl dlg.list from to op
		</programlisting>
		</section>
	</section>



	<section>
	<title>Exported pseudo-variables</title>

		<section>
			<title><varname>$DLG_count</varname></title>
			<para>
			Returns the number of current active dialogs (may be confirmed or
			not).
			</para>
		</section>

		<section>
			<title><varname>$DLG_status</varname></title>
			<para>
			Returns the status of the dialog corresponding to the processed
			sequential request. This PV will be available only for sequential
			requests, after doing loose_route().
			</para>
			<para>
			Value may be:
			</para>
			<itemizedlist>
				<listitem><para>
					<emphasis>NULL</emphasis> - Dialog not found.
				</para></listitem>
				<listitem><para>
					<emphasis>3</emphasis> - Confirmed by a final reply but
					no ACK received yet.
				</para></listitem>
				<listitem><para>
					<emphasis>4</emphasis> - Confirmed by a final reply and
					ACK received.
				</para></listitem>
				<listitem><para>
					<emphasis>5</emphasis> - Dialog ended.
				</para></listitem>
			</itemizedlist>
		</section>

		<section>
			<title><varname>$DLG_lifetime</varname></title>
			<para>
			Returns the duration (in seconds) of the dialog corresponding to
			the processed sequential request. The duration is calculated from
			the dialog confirmation and the current moment. This PV will be
			available only for sequential requests, after doing loose_route().
			</para>
			<para>
			NULL will be returned if there is no dialog for the request.
			</para>
		</section>
		<section>
			<title><varname>$dlg(...)</varname></title>
			<para>Access to dialog attributes.</para>
		</section>
		<section>
			<title><varname>$dlg_ctx(...)</varname></title>
			<para>Access to dialog context attributes.</para>
		</section>

		<section>
			<title><varname>$dlg_var(key)</varname></title>
			<para>
			This is a read/write variable that can be used to store 
			custom values assigned with a dialog (e.g. the URI of a
			billing-server, an assigned emergency-server).
			This pseudo-variable will be available only for subsequential
			requests after doing loose_route().
			</para>
			<para>
			Note: You will receive "NULL", if there is no dialog for this
			request.
			</para>
		</section>

	</section>

	<section>
	<title>Event Routes</title>
		<section>
			<title><varname>event_route[dialog:start]</varname></title>
			<para>
			Executed when 200OK for INVITE is processed.
			</para>
		</section>
		<section>
			<title><varname>event_route[dialog:end]</varname></title>
			<para>
			Executed when BYE is processed or dialog timed out.
			</para>
		</section>
		<section>
			<title><varname>event_route[dialog:failed]</varname></title>
			<para>
			Executed when dialog is not completed (+300 reply to INVITE).
			</para>
		</section>
	</section>

</chapter>
