Search the Internet for sip alg and see how can you disable it on your router.
-ovidiu On Sun, Apr 28, 2024 at 09:34 Pavan Kumar via sr-users < sr-users@lists.kamailio.org> wrote: > Hi everyone, > > Here is my setup > > SIP Client (MacBook) <=> Kamailio (AWS) <=> Freeswitch (AWS) > > When I initiate a call from Client, audio won't be sent out, but the > client can receive audio. (When the client receives the call > everything works fine). I started to trace the SIP message using tdpdump. > And here is an interesting thing. > > Kamailio sends the following SDP message while sending 200 OK > > v=0 > o=FreeSWITCH 1714278184 1714278185 IN IP4 *<freeswitch-ip-address>* > s=FreeSWITCH > c=IN IP4 *<freeswitch-ip-address>* > t=0 0 > m=audio 27644 RTP/AVP 120 101 > a=rtpmap:120 opus/48000/2 > a=fmtp:120 useinbandfec=1 > a=rtpmap:101 telephone-event/8000 > a=fmtp:101 0-15 > a=ptime:20 > > > But on my computer where SIP client is running I receive following message > > v=0 > o=FreeSWITCH 1714278184 1714278185 IN IP4 *<kamailio-ip-address>* > s=FreeSWITCH > c=IN IP4 *<kamailio-ip-address>* > t=0 0 > m=audio 27644 RTP/AVP 120 101 > a=rtpmap:120 opus/48000/2 > a=fmtp:120 useinbandfec=1 > a=rtpmap:101 telephone-event/8000 > a=fmtp:101 0-15 > a=ptime:20 > > Somehow, somewhere, somebody is modifying the IP address in the SDP > message, hence the SIP client is sending audio to "Kamailio" instead of > "Freeswitch" server. > > My initial guess was my router might be modifying it. After checking the > router settings I found SIP ALG is enabled. I disabled it, yet no use. > > I changed my internet connection to a different provider and things > started working. SDP is not getting modified. > > Have you ever faced such an issue where someone/something is modifying the > SDP messages. How did you debug to figure out which component was modifying > it? And common fixes for such weird situations? > > > > Thanks and Regards, > Pavan Kumar > __________________________________________________________ > Kamailio - Users Mailing List - Non Commercial Discussions > To unsubscribe send an email to sr-users-le...@lists.kamailio.org > Important: keep the mailing list in the recipients, do not reply only to > the sender! > Edit mailing list options or unsubscribe: >
__________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions To unsubscribe send an email to sr-users-le...@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:
