>>attribute of the SDP just showing one.
>>Can any one tell what does it means and
0 and 18 are standard payload types as
listed in RFC 3551.
Some of the common ones are:
PT encoding media type clock rate channels
name (Hz)
___________________________________________________
0 PCMU A 8,000 1
3 GSM A 8,000 1
4 G723 A 8,000 1
8 PCMA A 8,000 1
18 G729 A 8,000 1
So, for your SDP of "m=audio 21092 RTP/AVP 18 0 100", the 0 refers to
PCMU.
>>which one has precedence
>>if I have media description and rtpmap present in an SDP?
The preferered order is "18 0 100" (not the same thing as precedence).
Regards,
Attila
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Rashid Shakil
Sent: 20 May 2008 16:21
To: [email protected]
Subject: [Sip-implementors] Codec Preference Option (RTP Profile
Selection)
Quick question I was analyzing the SDP which my softswtich is sending
in response to an INVITE for an inbound call I received from my SIP
peer. I noticed that I can see two codec choices in media description
(m=) line but the rtpmap attribute of the SDP just showing one. Can any
one tell what does it means and which one has precedence if I have media
description and rtpmap present in an SDP?
c=IN IP4 5.5.5.2
t=0 0
m=audio 21092 RTP/AVP 18 0 100
a=rtpmap:18 G729/8000
a=rtpmap:100 telephone-event/8000
a=fmtp:100 0-11
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