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Beef up the IAX2 sample configuration a bit and fix some formatting issues.

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@357821 65c4cc65-6c06-0410-ace0-fbb531ad65f3
certified/11.2
Sean Bright 13 years ago
parent 3af920cf01
commit 2d92c50ce3
1 changed files with 244 additions and 170 deletions
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414
configs/iax.conf.sample
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@ -1,72 +1,119 @@
; Inter-Asterisk eXchange driver definition
;
; This configuration is re-read at reload
; or with the CLI command
; reload chan_iax2.so
; Inter-Asterisk eXchange v2 (IAX2) Channel Driver configuration
;
; This configuration is read when the chan_iax2.so module is loaded, and is
; re-read when the module is reloaded, such as when the invoking the CLI
; command:
;
; General settings, like port number to bind to, and
; an option address (the default is to bind to all
; local addresses).
; *CLI> iax2 reload
;
; General settings, like port number to bind to, and an option address (the
; default is to bind to all local addresses).
[general]
;bindport=4569 ; bindport and bindaddr may be specified
; ; NOTE: bindport must be specified BEFORE
; bindaddr or may be specified on a specific
; bindaddr if followed by colon and port
; (e.g. bindaddr=192.168.0.1:4569)
;bindaddr=192.168.0.1 ; more than once to bind to multiple
; ; addresses, but the first will be the
; ; default
;
; Set iaxcompat to yes if you plan to use layered switches or
; some other scenario which may cause some delay when doing a
; lookup in the dialplan. It incurs a small performance hit to
; enable it. This option causes Asterisk to spawn a separate thread
; when it receives an IAX DPREQ (Dialplan Request) instead of
; blocking while it waits for a response.
; Listener Addresses
;
; Use the 'bindaddr' and 'bindport' options to specify on which address and port
; the IAX2 channel driver will listen for incoming requests.
;
;
;bindport=4569 ; The default port to listen on
; NOTE: bindport must be specified BEFORE bindaddr or
; may be specified on a specific bindaddr if followed by
; colon and port (e.g. bindaddr=192.168.0.1:4569)
;bindaddr=192.168.0.1 ; You can specify 'bindaddr' more than once to bind to
; multiple addresses, but the first will be the
; default.
;
; Set 'iaxcompat' to yes if you plan to use layered switches or some other
; scenario which may cause some delay when doing a lookup in the dialplan. It
; incurs a small performance hit to enable it. This option causes Asterisk to
; spawn a separate thread when it receives an IAX2 DPREQ (Dialplan Request)
; instead of blocking while it waits for a response.
;
; Accepted values: yes, no
; Default value: no
;
;iaxcompat=yes
;
;
; Disable UDP checksums (if nochecksums is set, then no checkums will
; be calculated/checked on systems supporting this feature)
;
;nochecksums=no
; Accepted values: yes, no
; Default value: no
;
;nochecksums=yes
;
;
; For increased security against brute force password attacks enable
; 'delayreject' which will delay the sending of authentication reject for REGREQ
; or AUTHREP if there is a password.
;
; For increased security against brute force password attacks
; enable "delayreject" which will delay the sending of authentication
; reject for REGREQ or AUTHREP if there is a password.
; Accepted values: yes, no
; Default value: no
;
;delayreject=yes
;
; You may specify a global default AMA flag for iaxtel calls. It must be
; one of 'default', 'omit', 'billing', or 'documentation'. These flags
; are used in the generation of call detail records.
;
; You may specify a global default AMA flag for iaxtel calls. These flags are
; used in the generation of call detail records.
;
; Accepted values: default, omit, billing, documentation
; Default value: default
;
;amaflags=default
;amaflags=billing
;
;
; ADSI (Analog Display Services Interface) can be enabled if you have
; (or may have) ADSI compatible CPE equipment
; ADSI (Analog Display Services Interface) can be enabled if you have (or may
; have) ADSI compatible CPE equipment.
;
; Accepted values: yes, no
; Default value: no
;
;adsi=yes
;
;
;adsi=no
; Whether or not to perform an SRV lookup on outbound calls.
;
; Perform an SRV lookup on outbound calls
; Accepted values: yes, no
; Default value: no
;
;srvlookup=yes
;
; You may specify a default account for Call Detail Records in addition
; to specifying on a per-user basis
;
; You may specify a default account for Call Detail Records (CDRs) in addition to
; specifying on a per-user basis.
;
; Accepted values: Any string value up to 19 characters in length
; Default value: <empty>
;
;accountcode=lss0101
;
; You may specify a global default language for users.
; Can be specified also on a per-user basis
; If omitted, will fallback to english
;
; You may specify a global default language for users. This can be specified
; also on a per-user basis. If omitted, will fallback to English (en).
;
; Accepted values: A language tag such as 'en' or 'es'
; Default value: en
;
;language=en
;
; This option specifies a preference for which music on hold class this channel
;
; This option specifies a preference for which music-on-hold class this channel
; should listen to when put on hold if the music class has not been set on the
; channel with Set(CHANNEL(musicclass)=whatever) in the dialplan, and the peer
; channel putting this one on hold did not suggest a music class.
@ -76,35 +123,48 @@
;
; This option may be specified globally, or on a per-user or per-peer basis.
;
; Accepted values: passthrough, or any music-on-hold class name
; Default value: <empty>
;
;mohinterpret=default
;
; This option specifies which music on hold class to suggest to the peer channel
; when this channel places the peer on hold. It may be specified globally or on
; a per-user or per-peer basis.
;
; The 'mohsuggest' option specifies which music on hold class to suggest to the
; peer channel when this channel places the peer on hold. It may be specified
; globally or on a per-user or per-peer basis.
;
;mohsuggest=default
;
;
; Specify bandwidth of low, medium, or high to control which codecs are used
; in general.
;
bandwidth=low
;
; You can also fine tune codecs here using "allow" and "disallow" clauses
; with specific codecs. Use "all" to represent all formats.
;
;allow=all ; same as bandwidth=high
;disallow=g723.1 ; Hm... Proprietary, don't use it...
disallow=lpc10 ; Icky sound quality... Mr. Roboto.
;allow=gsm ; Always allow GSM, it's cool :)
; You can also fine tune codecs here using "allow" and "disallow" clauses with
; specific codecs. Use "all" to represent all formats.
;
;allow=all
;disallow=g723.1
disallow=lpc10
;allow=gsm
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Jitter Buffer
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; You can adjust several parameters relating to the jitter buffer.
; The jitter buffer's function is to compensate for varying
; network delay.
;
; All the jitter buffer settings are in milliseconds.
; The jitter buffer works for INCOMING audio - the outbound audio
; will be dejittered by the jitter buffer at the other end.
; You can adjust several parameters relating to the jitter buffer. The jitter
; buffer's function is to compensate for varying network delay.
;
; All of the jitter buffer settings are in milliseconds. The jitter buffer
; works for INCOMING audio only - the outbound audio will be dejittered by the
; jitter buffer at the other end.
;
; jitterbuffer=yes|no: global default as to whether you want
; the jitter buffer at all.
@ -133,7 +193,6 @@ disallow=lpc10 ; Icky sound quality... Mr. Roboto.
; returning this many interpolations. This prevents interpolating throughout
; a long silence.
;
;
; jittertargetextra: number of milliseconds by which the new jitter buffer
; will pad its size. the default is 40, so without modification, the new
; jitter buffer will set its size to the jitter value plus 40 milliseconds.
@ -148,51 +207,64 @@ forcejitterbuffer=no
;resyncthreshold=1000
;jittertargetextra=40
; Minimum and maximum amounts of time that IAX peers can request as
; a registration expiration interval (in seconds).
; minregexpire = 60
; maxregexpire = 60
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; IAX2 Encryption
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; Enable IAX2 encryption. The default is no.
;
; encryption = yes
;encryption=yes
;
;
; Force encryption insures no connection is established unless both sides support
; encryption. By turning this option on, encryption is automatically turned on as well.
; Force encryption insures no connection is established unless both sides
; support encryption. By turning this option on, encryption is automatically
; turned on as well. The default is no.
;
;forceencryption=yes
;
; forceencryption = yes
; This option defines the maximum payload in bytes an IAX2 trunk can support at a given time.
; The best way to explain this is to provide an example. If the maximum number of calls
; to be supported is 800, and each call transmits 20ms frames of audio using ulaw
; ((8000hz / 1000ms) * 20ms * 1 byte per sample = 160 bytes per frame), the maximum load
; in bytes is (160 bytes per frame) * (800 calls) = 128000 bytes total. Once this limit is
; reached, calls may be dropped or begin to lose audio. Depending on the codec in use and
; number of channels to be supported this value may need to be raised, but in most cases the
; default value is large enough.
; This option defines the maximum payload in bytes an IAX2 trunk can support at
; a given time. The best way to explain this is to provide an example. If the
; maximum number of calls to be supported is 800, and each call transmits 20ms
; frames of audio using ulaw:
;
; (8000hz / 1000ms) * 20ms * 1 byte per sample = 160 bytes per frame
;
; The maximum load in bytes is:
;
; (160 bytes per frame) * (800 calls) = 128000 bytes
;
; trunkmaxsize = 128000 ; defaults to 128000 bytes, which supports up to 800 calls of ulaw
; ; at 20ms a frame.
; Once this limit is reached, calls may be dropped or begin to lose audio.
; Depending on the codec in use and number of channels to be supported this value
; may need to be raised, but in most cases the default value is large enough.
;
; trunkmaxsize = 128000 ; defaults to 128000 bytes, which supports up to 800
; calls of ulaw at 20ms a frame.
; With a large amount of traffic on IAX2 trunks, there is a risk of bad voice quality when
; allowing the Linux system to handle fragmentation of UDP packets. Depending on the size of
; each payload, allowing the O/S to handle fragmentation may not be very efficient. This
; setting sets the maximum transmission unit for IAX2 UDP trunking. The default is 1240 bytes
; which means if a trunk's payload is over 1240 bytes for every 20ms it will be broken into
; multiple 1240 byte messages. Zero disables this functionality and let's the O/S handle
; With a large amount of traffic on IAX2 trunks, there is a risk of bad voice
; quality when allowing the Linux system to handle fragmentation of UDP packets.
; Depending on the size of each payload, allowing the OS to handle fragmentation
; may not be very efficient. This setting sets the maximum transmission unit for
; IAX2 UDP trunking. The default is 1240 bytes which means if a trunk's payload
; is over 1240 bytes for every 20ms it will be broken into multiple 1240 byte
; messages. Zero disables this functionality and let's the OS handle
; fragmentation.
;
; trunkmtu = 1240 ; trunk data will be sent in 1240 byte messages.
; trunkmtu = 1240 ; trunk data will be sent in 1240 byte messages.
; trunkfreq sets how frequently trunk messages are sent in milliseconds. This value is 20ms by
; default, which means the trunk will send all the date queued to it in the past 20ms. By
; increasing the time between sending trunk messages, the trunk's payload size will increase as
; well. Note, depending on the size set by trunkmtu, messages may be sent more often than
; specified. For example if a trunk's message size grows to the trunkmtu size before 20ms is
; reached that message will be sent immediately. Acceptable values are between 10ms and
; trunkfreq sets how frequently trunk messages are sent in milliseconds. This
; value is 20ms by default, which means the trunk will send all the data queued
; to it in the past 20ms. By increasing the time between sending trunk messages,
; the trunk's payload size will increase as well. Note, depending on the size
; set by trunkmtu, messages may be sent more often than specified. For example
; if a trunk's message size grows to the trunkmtu size before 20ms is reached
; that message will be sent immediately. Acceptable values are between 10ms and
; 1000ms.
;
; trunkfreq=20 ; How frequently to send trunk msgs (in ms). This is 20ms by default.
; trunkfreq=20 ; How frequently to send trunk msgs (in ms). This is 20ms by
; default.
; Should we send timestamps for the individual sub-frames within trunk frames?
; There is a small bandwidth use for these (less than 1kbps/call), but they
@ -202,16 +274,22 @@ forcejitterbuffer=no
; also support this feature, although they do not also need to have it enabled.
;
; trunktimestamps=yes
;
; IAX helper threads
; Minimum and maximum amounts of time that IAX2 peers can request as a
; registration expiration interval (in seconds).
; minregexpire = 60
; maxregexpire = 60
; IAX2 helper threads
; Establishes the number of iax helper threads to handle I/O.
; iaxthreadcount = 10
; Establishes the number of extra dynamic threads that may be spawned to handle I/O
; iaxmaxthreadcount = 100
;
; We can register with another IAX server to let him know where we are
; We can register with another IAX2 server to let him know where we are
; in case we have a dynamic IP address for example
;
; Register with tormenta using username marko and password secretpass
@ -234,9 +312,9 @@ forcejitterbuffer=no
;
;register => user:pass@iaxtel.com
;
; Sample Registration for IAX + FWD
; Sample Registration for IAX2 + FWD
;
; To register using IAX with FWD, it must be enabled by visiting the URL
; To register using IAX2 with FWD, it must be enabled by visiting the URL
; http://www.fwdnet.net/index.php?section_id=112
;
; Note that you need an extension in you default context which matches
@ -282,7 +360,7 @@ forcejitterbuffer=no
;
autokill=yes
;
; codecpriority controls the codec negotiation of an inbound IAX call.
; codecpriority controls the codec negotiation of an inbound IAX2 call.
; This option is inherited to all user entities. It can also be defined
; in each user entity separately which will override the setting in general.
;
@ -301,7 +379,7 @@ autokill=yes
;codecpriority=host
;
; allowfwdownload controls whether this host will serve out firmware to
; IAX clients which request it. This has only been used for the IAXy,
; IAX2 clients which request it. This has only been used for the IAXy,
; and it has been recently proven that this firmware distribution method
; can be used as a source of traffic amplification attacks. Also, the
; IAXy firmware has not been updated for at least 18 months, so unless
@ -311,33 +389,32 @@ autokill=yes
;allowfwdownload=yes
;rtcachefriends=yes ; Cache realtime friends by adding them to the internal list
; just like friends added from the config file only on a
; as-needed basis? (yes|no)
; just like friends added from the config file only on a
; as-needed basis? (yes|no)
;rtsavesysname=yes ; Save systemname in realtime database at registration
; Default = no
;rtsavesysname=yes ; Save systemname in realtime database at registration
; Default = no
;rtupdate=yes ; Send registry updates to database using realtime? (yes|no)
; If set to yes, when a IAX2 peer registers successfully,
; the ip address, the origination port, the registration period,
; and the username of the peer will be set to database via realtime.
; If not present, defaults to 'yes'.
;rtupdate=yes ; Send registry updates to database using realtime? (yes|no)
; If set to yes, when a IAX2 peer registers successfully,
; the IP address, the origination port, the registration period,
; and the username of the peer will be set to database via realtime.
; If not present, defaults to 'yes'.
;rtautoclear=yes ; Auto-Expire friends created on the fly on the same schedule
; as if it had just registered? (yes|no|<seconds>)
; If set to yes, when the registration expires, the friend will
; vanish from the configuration until requested again.
; If set to an integer, friends expire within this number of
; seconds instead of the registration interval.
;rtautoclear=yes ; Auto-Expire friends created on the fly on the same schedule
; as if it had just registered? (yes|no|<seconds>)
; If set to yes, when the registration expires, the friend will
; vanish from the configuration until requested again.
; If set to an integer, friends expire within this number of
; seconds instead of the registration interval.
;rtignoreregexpire=yes ; When reading a peer from Realtime, if the peer's registration
; has expired based on its registration interval, used the stored
; address information regardless. (yes|no)
;parkinglot=edvina ; Default parkinglot for IAX peers and users
; This can also be configured per device
; Parkinglots are defined in features.conf
;rtignoreregexpire=yes ; When reading a peer from Realtime, if the peer's registration
; has expired based on its registration interval, used the stored
; address information regardless. (yes|no)
;parkinglot=edvina ; Default parkinglot for IAX2 peers and users
; This can also be configured per device
; Parkinglots are defined in features.conf
;
; The following two options are used to disable call token validation for the
@ -345,12 +422,12 @@ autokill=yes
;
; Call token validation can be set as optional for a single IP address or IP
; address range by using the 'calltokenoptional' option. 'calltokenoptional' is
; only a global option.
; only a global option.
;
;calltokenoptional=209.16.236.73/255.255.255.0
;
; By setting 'requirecalltoken=no', call token validation becomes optional for
; that peer/user. By setting 'requirecalltoken=auto', call token validation
; that peer/user. By setting 'requirecalltoken=auto', call token validation
; is optional until a call token supporting peer registers successfully using
; call token validation. This is used as an indication that from now on, we
; can require it from this peer. So, requirecalltoken is internally set to yes.
@ -380,7 +457,7 @@ autokill=yes
; has been disabled. Unlike the 'maxcallnumbers' option, this limit is not
; separate for each individual IP address. Any connection resulting in a
; non-call token validated call number being allocated contributes to this
; limit. For use cases, see the call token user guide. This option's
; limit. For use cases, see the call token user guide. This option's
; default value of 8192 should be sufficient in most cases.
;
;maxcallnumbers_nonvalidated=1024
@ -389,7 +466,7 @@ autokill=yes
; for specific IP addresses and IP address ranges. These limits take precedence
; over the global 'maxcallnumbers' option, but may still be overridden by a
; peer defined 'maxcallnumbers' entry. Note that these limits take effect
; for every individual address within the range, not the range as a whole.
; for every individual address within the range, not the range as a whole.
;
;[callnumberlimits]
;10.1.1.0/255.255.255.0 = 24
@ -397,9 +474,9 @@ autokill=yes
;
; The shrinkcallerid function removes '(', ' ', ')', non-trailing '.', and '-' not
; in square brackets. For example, the caller id value 555.5555 becomes 5555555
; in square brackets. For example, the Caller*ID value 555.5555 becomes 5555555
; when this option is enabled. Disabling this option results in no modification
; of the caller id value, which is necessary when the caller id represents something
; of the Caller*ID value, which is necessary when the Caller*ID represents something
; that must be preserved. This option can only be used in the [general] section.
; By default this option is on.
;
@ -432,8 +509,7 @@ auth=rsa
inkeys=freeworlddialup
;
; Trust callerid delivered over DUNDi/e164
;
; Trust Caller*ID delivered over DUNDi/e164
;
;[dundi]
;type=user
@ -445,7 +521,7 @@ inkeys=freeworlddialup
; for connections with that given authentication name. Limited IP based
; access control is allowed by use of "permit" and "deny" keywords. Multiple
; rules are permitted. Multiple permitted contexts may be specified, in
; which case the first will be the default. You can also override caller*ID
; which case the first will be the default. You can also override Caller*ID
; so that when you receive a call you set the Caller*ID to be what you want
; instead of trusting what the remote user provides
;
@ -466,7 +542,6 @@ inkeys=freeworlddialup
; only; you should not expect any of them to actually be available for
; your use.
;
;
;[markster]
;type=user
;context=default
@ -477,60 +552,62 @@ inkeys=freeworlddialup
; cause the given audio file to
; be played upon completion of
; an attended transfer.
;dbsecret=mysecrets/place ; Secrets can be stored in astdb, too
;transfer=no ; Disable IAX native transfer
;transfer=mediaonly ; When doing IAX native transfers, transfer
; only media stream
;jitterbuffer=yes ; Override global setting an enable jitter buffer
; ; for this user
;maxauthreq=10 ; Set maximum number of outstanding AUTHREQs waiting for replies. Any further authentication attempts will be blocked
; ; if this limit is reached until they expire or a reply is received.
;dbsecret=mysecrets/place ; Secrets can be stored in astdb, too
;transfer=no ; Disable IAX2 native transfer
;transfer=mediaonly ; When doing IAX2 native transfers, transfer only
; the media stream
;jitterbuffer=yes ; Override the global setting and enable the jitter
; buffer for this user
;maxauthreq=10 ; Set the maximum number of outstanding AUTHREQs
; waiting for replies. If this limit is reached,
; any further authentication will be blocked, until
; the pending requests expire or a reply is
; received.
;callerid="Mark Spencer" <(256) 428-6275>
;deny=0.0.0.0/0.0.0.0
;accountcode=markster0101
;permit=209.16.236.73/255.255.255.0
;language=en ; Use english as default language
;encryption=yes ; Enable IAX2 encryption. The default is no.
;keyrotate=off ; This is a compatibility option for older versions of
; ; IAX2 that do not support key rotation with encryption.
; ; This option will disable the IAX_COMMAND_RTENC message.
; ; default is on.
; ;
;language=en ; Use english as default language
;encryption=yes ; Enable IAX2 encryption. The default is no.
;keyrotate=off ; This is a compatibility option for older versions
; of IAX2 that do not support key rotation with
; encryption. This option will disable the
; IAX_COMMAND_RTENC message. The default is on.
;
; Peers may also be specified, with a secret and
; a remote hostname.
; Peers may also be specified, with a secret and a remote hostname.
;
[demo]
type=peer
username=asterisk
secret=supersecret
host=216.207.245.47
description=Demo System At Digium ; Description of this peer, as listed by 'iax2 show peers'
description=Demo System At Digium ; Description of this peer, as listed by
; 'iax2 show peers'
;sendani=no
;host=asterisk.linux-support.net
;port=5036
;mask=255.255.255.255
;qualify=yes ; Make sure this peer is alive
;qualifysmoothing = yes ; use an average of the last two PONG
; results to reduce falsely detected LAGGED hosts
; Default: Off
;qualifyfreqok = 60000 ; how frequently to ping the peer when
; everything seems to be ok, in milliseconds
;qualifyfreqnotok = 10000 ; how frequently to ping the peer when it's
; either LAGGED or UNAVAILABLE, in milliseconds
;jitterbuffer=no ; Turn off jitter buffer for this peer
;
;encryption=yes ; Enable IAX2 encryption. The default is no.
;keyrotate=off ; This is a compatibility option for older versions of
; ; IAX2 that do not support key rotation with encryption.
; ; This option will disable the IAX_COMMAND_RTENC message.
; ; default is on.
; ;
;qualify=yes ; Make sure this peer is alive.
;qualifysmoothing = yes ; Use an average of the last two PONG results to
; reduce falsely detected LAGGED hosts. The default
; is 'no.'
;qualifyfreqok = 60000 ; How frequently to ping the peer when everything
; seems to be OK, in milliseconds.
;qualifyfreqnotok = 10000 ; How frequently to ping the peer when it's either
; LAGGED or UNAVAILABLE, in milliseconds.
;jitterbuffer=no ; Turn off jitter buffer for this peer
;
;encryption=yes ; Enable IAX2 encryption. The default is no.
;keyrotate=off ; This is a compatibility option for older versions
; of IAX2 that do not support key rotation with
; encryption. This option will disable the
; IAX_COMMAND_RTENC message. The default is 'on.'
; Peers can remotely register as well, so that they can be mobile. Default
; IP's can also optionally be given but are not required. Caller*ID can be
; IPs can also optionally be given but are not required. Caller*ID can be
; suggested to the other side as well if it is for example a phone instead of
; another PBX.
;
;[dynamichost]
;host=dynamic
@ -540,9 +617,7 @@ description=Demo System At Digium ; Description of this peer, as listed by 'iax2
;peercontext=local ; Default context to request for calls to peer
;defaultip=216.207.245.34
;callerid="Some Host" <(256) 428-6011>
;
;
;[biggateway]
;type=peer
;host=192.168.0.1
@ -551,12 +626,11 @@ description=Demo System At Digium ; Description of this peer, as listed by 'iax2
;secret=myscret
;trunk=yes ; Use IAX2 trunking with this host
;timezone=America/New_York ; Set a timezone for the date/time IE
;
;
; Friends are a short cut for creating a user and
; a peer with the same values.
; Friends are a shortcut for creating a user and a peer with the same values.
;
;[marko]
;type=friend
;host=dynamic
@ -568,7 +642,7 @@ description=Demo System At Digium ; Description of this peer, as listed by 'iax2
;permit=0.0.0.0/0.0.0.0
;
; With immediate=yes, an IAX phone or a phone on an IAXy acts as a hot-line
; With immediate=yes, an IAX2 phone or a phone on an IAXy acts as a hot-line
; which goes immediately to the s extension when picked up. Useful for
; elevator phones, manual service, or other similar applications.
;

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