On Tue, September 27, 2005 20:22, Alex Lake said: > I've got a one-way audio problem, but I've looked through a few > documents on the subject and I'm not sure that it's the same issue. > > User A calls a local Asterisk user B via a public SIP gateway > (voiptalk.org) using (sip:[EMAIL PROTECTED]) > > B is connected to the Asterisk server via VPN > > B is registered (and has successful bi-directional conversations with > other users on the VPN) > > Asterisk correctly forwards the call via SIP and B's phone rings and is > answered, but B can't hear A > > So there appears to be an audio-path blockage from A via Asterisk to B. > > Now if A leaves a voicemail message on the asterisk box, that's fine > (the sound file contains a recording of A's voice!) > > Therefore, it looks like the problem is to do with the forwarding of RTP > packets by Asterisk from A (Internet origin) to B (VPN). > > Any ideas? >
If you're not doing NAT on the SOURCE IP of the A before transferring across the VPN, it is very likely that B is replying DIRECTLY to A rather than through the VPN. This will cause B to answer with a different Source IP than A has initiated the call to, causing the packets to be dropped. You can easily check this by doing a packet trace on the LAN segment of B... Good luck! -- Francesco Peeters ---- GPG Key = AA69 E7C6 1D8A F148 160C D5C4 9943 6E38 D5E3 7704 If your program doesn't recognize my signature, please visit http://www.CAcert.org/index.php?id=3 to retrieve the Root CA certificate. _______________________________________________ --Bandwidth and Colocation sponsored by Easynews.com -- Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
