[asterisk-dev] Outgoing international calls getting dropped 30 seconds into call

[Eloy Paris]

Hello,

I have been trying to track down a problem where my international
calls to Venezuela are getting dropped after about 30 seconds into the
call. I can hear the other party and the other party can hear me just
fine before the call gets dropped. My VoIP provider is BroadVoice and
this used to work just fine for a few months after we signed up with
BroadVoice, but then it started to happen.

I contacted BroadVoice support and they said that since I am on the
Bring Your Own Device (BYOD) plan they can't help me, but they suggested
that I try the Xten softphone to rule out a problem with Asterisk. I
tried and, to my surprise, calls don't get dropped.

Today I also tried with the ATA (Linksys PAP2) that I have connected to
Asterisk, and after connecting that ATA directly to BroadVoice, there
are no disconnects.

This leads me to think that there is something Asterisk is doing that
BroadVoice doesn't like. Please note that I have only noticed the
problem when calling Venezuela (local and long distance calls within the
US don't have this problem.)

I have noticed the following message in all these international calls
that get disconnected:

[Dec  6 21:33:29] NOTICE[6077] rtp.c: Comfort noise support incomplete in Asterisk (RFC 3389). Please turn off on client if possible. Client IP: 147.135.2.249

A sniffer trace shows the SIP device on the other side sending me a 487
Request Terminated SIP status code. This is what terminates the call.

I don't know where to go from here. Does anyone know if it is possible
for the SIP device on the other side to be disconnecting the call due
to Asterisk's lack of RFC 3389 support? If anyone here is interested in
getting to the bottom of this I will be happy to provide further sniffer
traces and debugging logs.

This is Asterisk 1.4.15 running on Linux.

Thanks in advance and my apologies if this is not the right forum (I've
searched the archives and the web and haven't found anything that looks
like this.)

Cheers,

Eloy Paris.-