[Freeswitch-users] SIP 183 on a leg before bleg invite in bridge

Fri Apr 20 12:45:46 MSD 2012

Answered my own question...

the problem occurrs when using call recording on a channel.  With the dial plan command:

<action application="record_session" data="somefile.wav"/>

the problem is experienced.  If we set call recording to only happen on the B-Leg using bridge:

<action application="bridge" data="{execute_on_answer=record_session 'somefile.wav'}sofia/gateway/gateway/1234"/>

then the problem doesnt exist.

I guess this is because FS is settling on a codec in order to start call recording, so the only way around this would be for FS to generate the ringing.  Im sure there is a way to do this, but in my particular setup this is not required, and setting the recording on the b-leg works just fine.

Many thanks

On 20 Apr 2012, at 09:14, Barnaby Ritchley wrote:

> Hi Guys
> 
> I have a situation where a call is received on a-leg, FS sends 183 session progress to the a-leg before the call is attempted in b-leg.
> 
> Then, when the b-leg attempts the call for the bridge and sends an invite, it receives 180 ringing, and this is not relayed back through the a leg, so the a-leg never hears ringing.
> 
> The call goes:
> 
> Cisco UA (1.1.1.1)  -> FS (2.2.2.2) -> Gateway (3.3.3.3)
> 
> Sofia config has nothing special in it, relevent sections:
> 
> <param name="inbound-codec-negotiation" value="generous"/>
> <param name="disable-transcoding" value="true"/>
> <param name="manual-redirect" value="true"/>
> <param name="disable-transfer" value="true"/>
> 
> and the dial plan is straight forward, just a bridge between the two endpoints.
> 
> Any ideas?
> 
> 
> 
> 
> Here is the trace of the call:
> 
> INVITE sip:1234 at 2.2.2.2:5060 SIP/2.0.
> Date: Fri, 20 Apr 2012 07:58:36 GMT.
> Call-Info: <sip:1.1.1.1:5060>;method="NOTIFY;Event=telephone-event;Duration=500".
> Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY.
> From: "User" <sip:00000000 at 1.1.1.1>;tag=467b6df4-0e4d-47d0-b237-533fec74e710-20598567.
> Allow-Events: presence, kpml.
> Supported: 100rel,timer,resource-priority,replaces.
> Supported: X-cisco-srtp-fallback.
> Supported: Geolocation.
> Min-SE:  1800.
> Content-Length: 212.
> To: <sip:1234 at 2.2.2.2>.
> Expires: 180.
> Content-Type: application/sdp.
> Call-ID: a088a380-f911172c-3d33e6-8d200795 at 1.1.1.1.
> Via: SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK7ccc6a3fe8979.
> CSeq: 101 INVITE.
> Session-Expires:  1800.
> Max-Forwards: 69.
> .
> v=0.
> o=CiscoSystemsCCM-SIP 2000 1 IN IP4 1.1.1.1.
> s=SIP Call.
> c=IN IP4 1.1.1.1.
> t=0 0.
> m=audio 31422 RTP/AVP 8 101.
> a=rtpmap:8 PCMA/8000.
> a=ptime:20.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-15.
> 
> 
> U 2012/04/20 08:58:16.142711 2.2.2.2:5060 -> 1.1.1.1:5060
> SIP/2.0 100 Trying.
> Via: SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK7ccc6a3fe8979.
> From: "User" <sip:00000000 at 1.1.1.1>;tag=467b6df4-0e4d-47d0-b237-533fec74e710-20598567.
> To: <sip:1234 at 2.2.2.2>.
> CSeq: 101 INVITE.
> User-Agent: FreeSWITCH.
> Content-Length: 0.
> .
> 
> 
> U 2012/04/20 08:58:16.169453 2.2.2.2:5060 -> 1.1.1.1:5060
> SIP/2.0 183 Session Progress.
> Via: SIP/2.0/UDP 1.1.1.1:5060;branch=z9hG4bK7ccc6a3fe8979.
> From: "User" <sip:00000000 at 1.1.1.1>;tag=467b6df4-0e4d-47d0-b237-533fec74e710-20598567.
> To: <sip:1234 at 2.2.2.2>;tag=vm45yDZjgmDKH.
> Call-ID: a088a380-f911172c-3d33e6-8d200795 at 1.1.1.1.
> CSeq: 101 INVITE.
> Contact: <sip:1234 at 2.2.2.2:5060;transport=udp>.
> User-Agent: FreeSWITCH.
> Accept: application/sdp.
> Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY.
> Supported: timer, precondition, path, replaces.
> Allow-Events: talk, hold, refer.
> Content-Type: application/sdp.
> Content-Disposition: session.
> Content-Length: 247.
> Remote-Party-ID: "1234" <sip:1234 at 2.2.2.2>;party=calling;privacy=off;screen=no.
> .
> v=0.
> o=FreeSWITCH 1334881876 1334881877 IN IP4 2.2.2.2.
> s=FreeSWITCH.
> c=IN IP4 2.2.2.2.
> t=0 0.
> m=audio 26820 RTP/AVP 8 101.
> a=rtpmap:8 PCMA/8000.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-16.
> a=silenceSupp:off - - - -.
> a=ptime:20.
> 
> 
> U 2012/04/20 08:58:16.176126 2.2.2.2:5080 -> 3.3.3.3:5060
> INVITE sip:05600660128 at 3.3.3.3:5060 SIP/2.0.
> Via: SIP/2.0/UDP 2.2.2.2:5080;rport;branch=z9hG4bK44BS1jH9Za6yS.
> Max-Forwards: 68.
> From: "00000000" <sip:00000000 at 2.2.2.2>;tag=4vjXj69rtpaeS.
> To: <sip:1234 at 3.3.3.3:5060>.
> Call-ID: 6d4df4bc-0561-1230-4e8c-001ec9d8773b.
> CSeq: 27118284 INVITE.
> Contact: <sip:gw+C4DF4B2A088C91 at 2.2.2.2:5080;transport=udp;gw=C4DF4B2A088C91>.
> User-Agent: FreeSWITCH.
> Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY.
> Supported: timer, precondition, path, replaces.
> Allow-Events: talk, hold, refer.
> Content-Type: application/sdp.
> Content-Disposition: session.
> Content-Length: 201.
> X-FS-Support: update_display,send_info.
> Remote-Party-ID: "00000000" <sip:00000000 at 2.2.2.2>;party=calling;screen=no;privacy=full.
> .
> v=0.
> o=FreeSWITCH 1334887230 1334887231 IN IP4 2.2.2.2.
> s=FreeSWITCH.
> c=IN IP4 2.2.2.2.
> t=0 0.
> m=audio 21466 RTP/AVP 8 101 13.
> a=rtpmap:101 telephone-event/8000.
> a=fmtp:101 0-16.
> a=ptime:20.
> 
> 
> U 2012/04/20 08:58:16.176573 3.3.3.3:5060 -> 2.2.2.2:5080
> SIP/2.0 100 Trying.
> Via: SIP/2.0/UDP 2.2.2.2:5080;rport=5080;branch=z9hG4bK44BS1jH9Za6yS.
> From: "00000000" <sip:00000000 at 2.2.2.2>;tag=4vjXj69rtpaeS.
> To: <sip:1234 at 3.3.3.3:5060>.
> Call-ID: 6d4df4bc-0561-1230-4e8c-001ec9d8773b.
> CSeq: 27118284 INVITE.
> User-Agent: SBC01.
> Content-Length: 0.
> .
> 
> 
> U 2012/04/20 08:58:16.282935 3.3.3.3:5060 -> 2.2.2.2:5080
> SIP/2.0 180 Ringing.
> Via: SIP/2.0/UDP 2.2.2.2:5080;rport=5080;branch=z9hG4bK44BS1jH9Za6yS.
> From: "00000000" <sip:00000000 at 2.2.2.2>;tag=4vjXj69rtpaeS.
> To: <sip:1234 at 3.3.3.3:5060>;tag=7NNjeSyyjtHSB.
> Call-ID: 6d4df4bc-0561-1230-4e8c-001ec9d8773b.
> CSeq: 27118284 INVITE.
> Contact: <sip:05600660128 at 3.3.3.3:5060;transport=udp>.
> User-Agent: SBC01.
> Accept: application/sdp.
> Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO, NOTIFY.
> Supported: timer, precondition, path, replaces.
> Allow-Events: talk, hold, refer.
> Content-Length: 0.
> 
> 
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