[Kamailio-Users] remove codec from SDP

[Iñaki Baz Castillo]

2009/3/31 Ovidiu Sas <osas at voipembedded.com>:
> Hello Klaus,
>
> No, there isn't.  But it shouldn't be that hard to add one using the
> sdp parser from the core.
> Once the sdp is parsed, the lumps must be added (the relevant pointers
> to the codecs and attributes are already saved in the parsed sdp
> structure).

Note that the only line to be modified is the "m=..." line, which
specifies which codes are offered.

Example:

-------------------------------
v=0
o=root 3836 3836 IN IP4 222.220.19.45
s=session
c=IN IP4 222.220.19.45
b=CT:384
t=0 0
m=audio 12342 RTP/AVP 18 0 8 3 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:3 GSM/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv
m=video 10482 RTP/AVP 34 103 99
a=rtpmap:34 H263/90000
a=rtpmap:103 h263-1998/90000
a=rtpmap:99 H264/90000
a=sendrecv
-------------------------------

To dissable GSM in the above SDP the only modification would be:

  m=audio 12342 RTP/AVP 18 0 8 101




-- 
Iñaki Baz Castillo
<ibc at aliax.net>