mirror of https://github.com/sipwise/sems.git
Stefan Sayer
16 years ago
parent
bb763d84c8
commit
03bf5b1e12
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# prepaid SBC profile
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#
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# prepaid is a back-to-back user agent application
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# that checks for the user's balance on connecting,
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# and ends the call when the balance has run out.
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# This application is known from the sw_prepaid_sip app.
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# See the explanation below.
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RURI=$H(P-Proxy);sw_prepaid
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#From=$f
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To=<$H(P-R-Uri)>
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## routing
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# outbound proxy:
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#outbound_proxy=sip:192.168.5.106:5060
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# force outbound proxy (in-dialog requests)?
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#force_outbound_proxy=yes
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# destination IP[:port] for outgoing requests
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#next_hop_ip=192.168.5.106
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#next_hop_port=5060
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## filters:
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#header_filter=blacklist
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#header_list=P-App-Param,P-App-Name
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#message_filter=transparent
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#message_list=
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## prepaid
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enable_prepaid=yes
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prepaid_accmodule=cc_acc
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prepaid_uuid=$H(P-Caller-Uuid)
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prepaid_acc_dest=$H(P-Acc-Dest)
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## call timer
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#enable_call_timer=yes
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# maximum call time in seconds.
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# take the timer value from "t" parameter of P-App-Param,
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# e.g. P-App-Param: t=120
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#call_timer=$P(t)
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#
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# Kamailio/sip-router script:
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# remove_hf("P-App-Param");
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# append_hf("P-App-Param: t=120\r\n");
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# t_relay_to_udp("10.0.0.3","5070");
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#
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#For a static value, set it like this
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#call_timer=120
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## authentication:
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#enable_auth=yes
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#auth_user=$P(u)
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#auth_pwd=$P(p)
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## session timer:
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#enable_session_timer=yes
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# if session_expires is not configured here,
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# the values from sbc.conf are used, or the
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# default values
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#session_expires=120
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#minimum_timer=90
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#session_refresh_method=UPDATE_FALLBACK_INVITE
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#accept_501_reply=yes
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#######################################################################
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#######################################################################
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#
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# sw_prepaid_sip, the signalling-only prepaid engine
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# Copyright (C) 2007 Sipwise GmbH
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# Based on mycc, Copyright (C) 2002-2003 Fhg Fokus
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#
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# Author: Andreas Granig <agranig@sipwise.com>
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#
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########################################################################
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#
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# How sw_prepaid_sip works
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# ------------------------
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# The plugin extracts the headers "P-Caller-Uuid" and "P-Acc-Dest" as
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# caller and callee identifiers, respectively. Using these values,
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# it calls an accounting backend, which can defined in sw_prepaid_sip.conf,
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# and fetches the maximum call duration (per default, cc_acc is used as
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# billing backend, which is just a dummy plugin to show the most basic
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# concept of a billing backend).
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#
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# If the credit is > 0, it uses the Request-Uri passed in the header "P-R-Uri"
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# and connects the callee using the outbound proxy passed in the header "P-Proxy".
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#
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# When the call duration exceeds the credit, the call is terminated by SEMS.
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#
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#
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# A typical call flow would look like this, where (a) is the caller leg and
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# (b) the callee leg:
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#
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# Caller Proxy SEMS Callee
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# | | | |
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# | INV(a) | | |
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# |--------->| | |
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# | 407(a) | | |
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# |<---------| | |
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# | INV(a) | | |
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# |--------->| | |
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# | 100(a) | | |
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# |<---------| | |
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# | | INV(a) | |
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# | |--------->| |
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# | | 101(a) | |
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# | |<---------| |
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# | | INV(b) | |
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# | |<---------| |
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# | | INV(b) | |
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# | |-------------------->|
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# | | | 180(b) |
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# | |<--------------------|
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# | | 180(b) | |
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# | |--------->| |
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# | | 180(a) | |
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# | |<---------| |
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# | 180(a) | | |
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# |<---------| | |
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# | | | 200(b) |
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# | |<--------------------|
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# | | 200(b) | |
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# | |--------->| |
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# | | 200(a) | |
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# | |<---------| |
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# | 200(a) | | |
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# |<---------| | |
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# | ACK(a) | | |
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# |--------->| | |
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# | | ACK(a) | |
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# | |--------->| |
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# | | ACK(b) | |
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# | |<---------| |
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# | | ACK(b) | |
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# | |-------------------->|
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# | | | |
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# | | | |
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#
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#
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# How to configure SEMS' sip proxy
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# --------------------------------
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#
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# Using SIP router, just add a proper block to pass prepaid calls to SEMS.
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#
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# In this example, we assume that calls prefixed by "pre" are considered prepaid
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# requests:
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#
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# if(uri =~ "sip:pre.+@")
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# {
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# strip(3);
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# # assume that SEMS is running at localhost:5080
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# t_relay_to("udp:localhost:5080");
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# break;
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# }
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#
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# If you need to pass other headers from leg (a) to leg (b), you can add them to "tw_append"
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# and they are copied to the other leg. This is for example necessary to pass the destination
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# URI to leg (b), which can then be extracted from the proxy and set accordingly.
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#
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# How to configure a proxy to interact with sw_prepaid_sip
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# --------------------------------------------------------
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#
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# If your proxy runs on IP 192.168.100.10:5060 and your SEMS' proxy on 192.168.100.10:5070, you
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# can pass leg (a) to the prepaid engine like this (assuming you use OpenSER >= 1.2.0 as
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# sip proxy):
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#
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# if(/* caller is prepaid */)
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# {
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# /* use authentication user as caller uuid in prepaid engine */
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# append_hf("P-Caller-Uuid: $au\r\n");
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#
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# /* use simplified R-URI as destination pattern in prepaid engine;
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# NOTE that cc_acc doesn't evaluate this field, but more
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# advanced backends might do, so sw_prepaid_sip requires
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# this header */
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# append_hf("P-Acc-Dest: $rU@$rd\r\n");
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#
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# /* the URI which is to be used by SEMS as outbound proxy for
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# call leg (b) - use our own here */
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# append_hf("P-Proxy: sip:192.168.100.10:5060\r\n");
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#
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# /* the R-URI to be used to connect call leg (b) */
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# append_hf("P-R-Uri: $ru\r\n");
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#
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# if($du != null)
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# {
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# /* if there's a D-Uri set, also send it to SEMS to correctly contact
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# call leg (b). NOTE you have to add this header in SEMS's sip proxy
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# config as "tw_append" value. */
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# append_hf("P-D-Uri: $du\r\n");
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# }
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#
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# /* point the R-Uri to SEMS' proxy and relay; this is just the most simple
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# example, but you can also use the LCR module for SEMS load balancing
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# and failover. */
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# rewriteuri("sip:192.168.100.10:5070");
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# t_relay();
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# }
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#
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# In the above block, call leg (a) is passed to SEMS. Now we prepare a block to catch
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# call leg (b) coming from SEMS. Add this at the very beginning of your proxy configuration.
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#
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# /* usual sanity checks like msg-size and max-fwd, then do something like: */
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#
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# if(src_ip == 192.168.100.10 && src_port == 5070 /* check if from SEMS */
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# && uri =~ ";sw_prepaid" /* this uri param is added by SEMS to detect prepaid calls */
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# && method == "INVITE" && !has_totag()) /* only process initial invites here */
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# {
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# /* recover the R-Uri (maybe check for existence first!) */
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# $ru = $hdr(P-R-Uri);
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#
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# /* recover destination Uri */
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# if(is_present_hf("P-D-Uri"))
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# {
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# $du = $hdr(P-D-Uri);
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# insert_hf("Route: <$hdr(P-D-Uri)>\r\n");
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# }
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#
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# /* you might also consider removing the helper headers
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# by calling remove_hf(...) */
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#
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# /* relay to callee */
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# t_relay();
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# }
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#
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# Please note that the above example is a very basic one. For example, if you want to route
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# to PSTN gateways, you might want to add an informational header in leg (a) and evaluate
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# it in leg (b) to load a set of PSTN gateways instead of relaying to the R-Uri.
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#
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# IMPORTANT: make sure to prevent black-hats from spoofing the SEMS proxy address to place
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# unauthenticated calls by using a private address for SEMS' sip proxy and by adding
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# proper firewall rules on your ingress router.
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