[Freeswitch-users] Strange early media SDP behavior

[Kristian Kielhofner]

It's standard SDP offer/answer. Fresswitch will not send three audio streams
with three codecs. You're advertising three codecs with PCMU first.
Freeswitch supports PCMU in your configuration and agrees on that codec.

There are several configuration options in freeswitch and the phone that can
influence this behavior.


--
Kristian Kielhofner
http://blog.krisk.org

----- Original Message -----
From: freeswitch-users-bounces at lists.freeswitch.org
<freeswitch-users-bounces at lists.freeswitch.org>
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Sent: Sat Aug 14 11:19:07 2010
Subject: [Freeswitch-users] Strange early media SDP behavior

Late negotiation is on, bypass_media=true. Leg B receives the following SDP
in
SIP 183 message:

   v=0
   o=root 4913 4913 IN IP4 64.21.13.41
   s=session
   c=IN IP4 64.21.13.41
   t=0 0
   m=audio 37650 RTP/AVP 0 8 18 101
   a=rtpmap:0 PCMU/8000
   a=rtpmap:8 PCMA/8000
   a=rtpmap:18 G729/8000
   a=fmtp:18 annexb=no
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=silenceSupp:off - - - -
   a=ptime:20
   a=sendrecv

3 codecs in SDP offer. Freeswitch send to leg A SIP 183 with the following
SDP:

   v=0
   o=root 4913 4913 IN IP4 64.21.13.41
   s=session
   c=IN IP4 64.21.13.41
   t=0 0
   m=audio 37650 RTP/AVP 0 101
   a=rtpmap:0 PCMU/8000
   a=rtpmap:101 telephone-event/8000
   a=fmtp:101 0-16
   a=silenceSupp:off - - - -
   a=ptime:20

1 codec only. Why 2 other codecs are removed from SDP? Tested on today's
git,
older versions have the same behavior. Is it expected behavior or a bug?


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