No, you aren't overlooking anything. What you describe is what happens. User B answers with a different port in the 200 but the rtp continues to source from the same port. The media relay just doesn't forward those packets.
I will try to get set back up to make some calls with this ALG device early this week and send the traces. Richard On Jul 30, 2010, at 4:35 AM, Saúl Ibarra Corretgé wrote: > Hi Richard, > > On 28/07/10 23:04, Richard Revels wrote: >> No need to apologize. I'm intruding on your time. Just wanted to make sure >> I didn't sit in a spam filter for a week or anything. :> >> >> I found I had the same problem if I used use_media_proxy in the invite and >> reinvite. However, since I am assured of the reinvite on every call from >> this source I just set a dialog flag in the invite to indicate I needed >> media proxy and waited to turn it on for the first time in the reinvite. >> That is doing the job for now. I suspect most users behind a Belkin home >> wifi router will cause this problem. On the particular model we have been >> working with, there seems to be no way to turn off the SIP ALG so it is >> particularly irritating. >> > > I looked at the SIP trace you sent but I can't see the reason why it > fails. User A sends the INVITE and after he sends the reINVITE (which > btw has the same media information) and user B answers with a different > port in the 200 OK. > > We have code to handle this situation, the stream is reset and the > conntrack rule will be re-generated same as it did with the first > INVITE, IIRC. > > Am I overlooking something here? > >> Anyway, I have a working solution and if you find something that can fix >> this while still using engage_media_proxy() that will be even better. >> > > You mentioned some ALG in the middle, can you confirm this doesn't > happen if you don't use this ALG device? How does the ALG craft the packets? > > > Regards, > > PS: Maybe you can find what the ALG does by capturing packets before and > after, just paste the differences. Ngrep is much nices to read btw ;-) > > -- > Saúl Ibarra Corretgé > AG Projects > > _______________________________________________ > Users mailing list > Users@lists.opensips.org > http://lists.opensips.org/cgi-bin/mailman/listinfo/users _______________________________________________ Users mailing list Users@lists.opensips.org http://lists.opensips.org/cgi-bin/mailman/listinfo/users
