[OpenSIPS-Users] B2B logic with forked calls
Bogdan-Andrei Iancu
bogdan at opensips.org
Wed Oct 6 09:18:39 EST 2021
Hi Denys,
Before diving into the B2B dark corners, I would strongly suggest to use
OpenSIPS with dialog + topology hiding modules, rather than B2B. The B2B
is not so friendly with parallel forking.
And as time as you only need TH, dialog + TH is be best way to do it.
Best regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
https://www.opensips-solutions.com
OpenSIPS eBootcamp 2021
https://opensips.org/training/OpenSIPS_eBootcamp_2021/
On 9/7/21 2:14 PM, Denys Pozniak wrote:
> 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
> <mailto: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
>
> /####### 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
> <http://192.168.27.84:5060> -> 192.168.27.84:5080
> <http://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
> <mailto:sip%3A5009 at 192.168.27.123>>;tag=3a8gNpgZQ89pj
> To: <sip:qq2s92mnbrda at 192.168.27.84
> <mailto:sip%3Aqq2s92mnbrda 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
> <http://sip:mod_sofia@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
> <http://192.168.27.84:5080> -> 192.168.27.126:5060
> <http://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
> <http://sip:qq2s92mnbrda@192.168.27.126:5060>
> From: "VOIP" <sip:5009 at 192.168.27.123
> <mailto:sip%3A5009 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
> <mailto:sip%3A5009 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
> <http://sip:5009@192.168.27.84:5080>>
>
> *Incoming SIP CANCEL:*
> 2021/09/07 11:38:33.593381 192.168.27.84:5060
> <http://192.168.27.84:5060> -> 192.168.27.84:5080
> <http://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
> <mailto:sip%3A5009 at 192.168.27.123>>;tag=3a8gNpgZQ89pj
> To: <sip:qq2s92mnbrda at 192.168.27.84
> <mailto:sip%3Aqq2s92mnbrda 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
> <http://192.168.27.84:5080> -> 192.168.27.126:5060
> <http://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
> <mailto:sip%3A5009 at 192.168.27.123>>;tag=94fd20254e546fee730f360cf9860800
> Call-ID: B2B.331.6374211.1631007510
> To: sip:qq2s92mnbrda at 192.168.27.126:5060
> <http://sip:qq2s92mnbrda@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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> Users at lists.opensips.org
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