Hi Attila,
This was discussed recently too. The pointer for that
mailing list thread is:
http://lists.cs.columbia.edu/pipermail/sip-implementors/2003-February/00455
6.html
As an aside, splitting the m= line as you have done is
syntactically correct, but semantically different from
the first description in your mail. The first semantics
implies that you wish to receive only one amongst the
u-law and the a-law codecs. The latter one means you
wish to receive _both_ at the same time on the same port.
If you wish to create a SDP description equivalent to
the first one below by splitting the media line in two,
then perhaps the 'ALT' grouping would also be of interest
to you:
http://www.ietf.org/internet-drafts/draft-camarillo-mmusic-alt-00.txt
Hope that helps.
Cheers,
Siddharth.
--------------------------------------------------------
Siddharth Toshniwal
Hughes Software Systems
Prestige Opal http://www.hssworld.com
146, Infantry Road Ph (O): +91-80-2286390 (7094)
Bangalore-560001, India Mobile: +91-9845154068
--------------------------------------------------------
Attila Sipos <[EMAIL PROTECTED]> on 03/11/2003 05:03:03 PM
To: [EMAIL PROTECTED]
cc: (bcc: Siddharth J Toshniwal/HSSBLR)
Subject: [Sip-implementors] SDP packet times for muliple codecs
Hello everyone,
For multiple codecs we can have an SDP like this:
m=audio 10000 RTP/AVP 0 8 ----- 0 means g711u-law and 8 means
g711a-law
a=ptime:20
But this is only correct if the packet times match for
u-law and a-law.
What if you have a system where, for some reason, the
codecs have different packet times?
Can you do this?
m=audio 10000 RTP/AVP 0 - ---- g711-ulaw
a=ptime:20
m=audio 10000 RTP/AVP 8 ---- g711 a-law
a=ptime:30
Regards,
Attila
<http://www.vegastream.com>
VegaStream : A World of difference for your Integrated Communications
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