I have disabled sip alg. No use. On Sun, 28 Apr 2024 at 9:20 PM, Ovidiu Sas <[email protected]> wrote:
> 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 < > [email protected]> 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 [email protected] >> Important: keep the mailing list in the recipients, do not reply only to >> the sender! >> Edit mailing list options or unsubscribe: >> >
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