[asterisk-users] RFC3389 message

[Tony Mountifield]

In article <475ECF62.3050805 at digium.com>,
Kevin P. Fleming <kpfleming at digium.com> wrote:
> Tony Mountifield wrote:
> > When making or receiving a SIP call via my service provider, I get the
> > following message logged by Asterisk:
> > 
> > Dec 11 15:13:37 NOTICE[7392]: rtp.c:331 process_rfc3389: Comfort noise support incomplete
> in Asterisk (RFC 3389). Please turn off on client if possible. Client IP: xxx.xxx.xxx.xxx
> > 
> > Since the "client" is at my service provider (who uses CISCO kit, I believe),
> > I don't have the ability to turn it off.
> 
> Well, this means that they are sending us RTP that we specifically
> declined to accept (meaning we did not offer to support RFC3389 in our
> SDP), which sucks because they are violating the protocol :-)
> 
> > My question is: what is the effect of leaving things as they are and just
> > ignoring the message? What things might not behave properly?
> 
> It's bad because the timestamps of the audio will have gaps when
> Asterisk drops the incoming CN packets. What effect this really has on
> your system will depend on where you are sending that audio and what it
> can do in terms of jitter buffering and other magic.

Well mostly the incoming audio is going into Meetme conferences, but
sometimes just being bridged to other SIP or IAX channels. The audio
quality has always sounded good.

Cheers
Tony
-- 
Tony Mountifield
Work: tony at softins.co.uk - http://www.softins.co.uk
Play: tony at mountifield.org - http://tony.mountifield.org