Hi all,
I am new to the use of the Osmocom project, it is indeed a very nice job.
I am currently trying to set up a configuration with a Asterisk PBX server and I have 2 questions:
1/ RTP configuration The SIP part (sip-connector vs Asterisk connection) works well so far, the communication starts but with no audio. I noticed that the RTP flux is sent to localhost instead of my server address (set as remote in sip-connector.cfg) and I was wondering if there is any possibility to send the RTP flow to an address which is not localhost ?
sip local 0.0.0.0 5069 remote 127.0.0.1 5060
2/ codec issue In a configuration where all the Osmocom servers (MSC, MGW, BSC…) and Asterisk are on the same machine, it got a message from my asterisk server, saying that no codec can be found to start a communication. By default, the wiki/manuals states that gsm has to be used but perhaps I am missing something in the BSC configuration, especially in the codec choice.
<--- SIP read from UDP:10.184.10.162:5069 ---> INVITE sip:899@127.0.0.1:5060 SIP/2.0 Via: SIP/2.0/UDP 10.184.10.162:5069;rport;branch=z9hG4bKpe1UXZU1amUja Max-Forwards: 70 From: sip:422@0.0.0.0:5069;tag=vyQKX32r72ZyQ To: sip:899@127.0.0.1:5060 Call-ID: cd65c5a0-fdbf-1238-51a9-000c29cfd753 CSeq: 949096397 INVITE Contact: sip:10.184.10.162:5069 User-Agent: sofia-sip/1.12.11devel Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE Supported: timer, 100rel Content-Type: application/sdp Content-Length: 133
v=0 o=Osmocom 0 0 IN IP4 127.0.0.1 s=GSM Call c=IN IP4 127.0.0.1 t=0 0 m=audio 4016 RTP/AVP 3 a=rtpmap:3 GSM/8000 a=sendrecv <-------------> --- (13 headers 8 lines) --- Sending to 10.184.10.162:5069 (no NAT) Sending to 10.184.10.162:5069 (no NAT) Using INVITE request as basis request - cd65c5a0-fdbf-1238-51a9-000c29cfd753 No matching peer for '422' from '10.184.10.162:5069' == Using SIP RTP CoS mark 5 Got SDP version 0 and unique parts [Osmocom 0 IN IP4 127.0.0.1] Found RTP audio format 3 Found audio description format GSM for ID 3 [2020-04-20 17:38:19] NOTICE[14918][C-00000015]: chan_sip.c:10957 process_sdp: No compatible codecs, not accepting this offer!
Thanks for your help Laurent