[OpenSIPS-Users] B2B logic with forked calls

[Denys Pozniak]

Adding a scheme of the current call-flow scenario maybe it is not
completely clear from the previous message:

FreeSWITCH --(1-call)--> Fork Proxy --(N-branches)--> SEMS --(N-calls)-->
Edge Proxy ----> N-devices


вт, 7 сент. 2021 г. в 12:57, Denys Pozniak <denys.pozniak at gmail.com>:

> Hello!
>
> Our service delivery logic is as follows:
> Each user has an internal extension, under which there are several devices
> with their own identifier.
> With an incoming call to such a subscriber, FreeSWITCH adds custom SIP
> headers with these device identifiers.
> Further on these fields the superior Proxy forks legs and then these legs
> pass through the Sems to become completely separate calls.
>
> Now there is a task to replace Sems with OpenSIPS.
> The script below works fine, but only if the incoming calls are not forked
>
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> *####### Routing Logic ########route{  if (is_method("INVITE") &&
> !has_totag()) {        b2b_init_request("top hiding");        exit;
> }}route[b2b_logic_request] {        b2b_pass_request();        exit;}*
>
> If there is a fork with an answer on some device, then OpenSIPS does not
> forward the SIP CANCEL (Reason: SIP;cause=200;text="Call completed
> elsewhere") to the rest and these devices keep ringing until timeout
> (Reason: SIP;cause=480;text="NO_ANSWER")
> Please help understand the nature of this behavior.
>
> version: opensips 3.2.2 (x86_64/linux)
>
> *Incoming SIP INVITE:*
> 2021/09/07 11:38:30.737456 192.168.27.84:5060 -> 192.168.27.84:5080
> INVITE sip:qq2s92mnbrda at 192.168.27.126:5060;transport=udp SIP/2.0
> Record-Route:
> <sip:192.168.27.84;lr=on;ftag=3a8gNpgZQ89pj;did=8b.4a4;vst=AAAAAEcYQ0JfBhUaEEoOFQAAAAAAAAAAAAAJBjY->
> Record-Route: <sip:192.168.27.126;lr=on;did=8b01.a1d4>
> Via: SIP/2.0/UDP
> 192.168.27.84;branch=z9hG4bKcc18.ec9a363ccc70d07691e11293d160cca6.1
> Via: SIP/2.0/UDP
> 192.168.27.126;branch=z9hG4bKcc18.accd8d8bac35ac66a172f6ce173c9a34.0
> Via: SIP/2.0/UDP
> 192.168.27.123;received=192.168.27.123;rport=5060;branch=z9hG4bKavcjKF58g9D1e
> Max-Forwards: 66
> From: "VOIP" <sip:5009 at 192.168.27.123>;tag=3a8gNpgZQ89pj
> To: <sip:qq2s92mnbrda at 192.168.27.84>
> Call-ID: 33e8140a-8a62-123a-e1ba-001dd8b71cb2
> CSeq: 40949963 INVITE
> Contact: <sip:mod_sofia at 192.168.27.123:5060>
> Supported: timer, path, replaces
> Allow-Events: talk, hold, conference, refer
> Privacy: none
> Content-Type: application/sdp
> Content-Disposition: session
>
> *Outgoing SIP INVITE:*
> 2021/09/07 11:38:30.737938 192.168.27.84:5080 -> 192.168.27.126:5060
> INVITE sip:qq2s92mnbrda at 192.168.27.126:5060;transport=udp SIP/2.0
> Via: SIP/2.0/UDP 192.168.27.84:5080;branch=z9hG4bK6ddf.d88b07f2.0
> To: sip:qq2s92mnbrda at 192.168.27.126:5060
> From: "VOIP" <sip:5009 at 192.168.27.123
> >;tag=94fd20254e546fee730f360cf9860800
> CSeq: 40949964 INVITE
> Call-ID: B2B.331.6374211.1631007510
> Max-Forwards: 70
> Content-Length: 486
> User-Agent: OpenSIPS (3.2.2 (x86_64/linux))
> Content-Type: application/sdp
> Supported: timer, path, replaces
> P-Asserted-Identity: " VOIP" <sip:5009 at 192.168.27.123>
> Privacy: none
> Content-Disposition: session
> X-Call-ID: 33e8140a-8a62-123a-e1ba-001dd8b71cb2
> Contact: <sip:5009 at 192.168.27.84:5080>
>
> *Incoming SIP CANCEL:*
> 2021/09/07 11:38:33.593381 192.168.27.84:5060 -> 192.168.27.84:5080
> CANCEL sip:qq2s92mnbrda at 192.168.27.126:5060;transport=udp SIP/2.0
> Via: SIP/2.0/UDP
> 192.168.27.84;branch=z9hG4bKcc18.ec9a363ccc70d07691e11293d160cca6.1
> Max-Forwards: 66
> From: "VOIP" <sip:5009 at 192.168.27.123>;tag=3a8gNpgZQ89pj
> To: <sip:qq2s92mnbrda at 192.168.27.84>
> Call-ID: 33e8140a-8a62-123a-e1ba-001dd8b71cb2
> CSeq: 40949963 CANCEL
> Content-Length: 0
> Reason: SIP;cause=200;text="Call completed elsewhere"
>
> *Outgoing SIP CANCEL by timeout (with 27 sec delay):*
> 2021/09/07 11:39:01.100888 192.168.27.84:5080 -> 192.168.27.126:5060
> CANCEL sip:qq2s92mnbrda at 192.168.27.126:5060;transport=udp SIP/2.0
> Via: SIP/2.0/UDP 192.168.27.84:5080;branch=z9hG4bK6ddf.d88b07f2.0
> From: "VOIP" <sip:5009 at 192.168.27.123
> >;tag=94fd20254e546fee730f360cf9860800
> Call-ID: B2B.331.6374211.1631007510
> To: sip:qq2s92mnbrda at 192.168.27.126:5060
> CSeq: 40949964 CANCEL
> Max-Forwards: 70
> Reason: SIP;cause=480;text="NO_ANSWER"
> User-Agent: OpenSIPS (3.2.2 (x86_64/linux))
> Content-Length: 0
>
>
>
> --
>
> BR,
> Denys Pozniak
>
>
>

-- 

BR,
Denys Pozniak
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