[SIPForum-discussion] Codec Prefrence Option (RTP Profile selection in multiple Codec)

Shakil, Rashid rshakil at covad.com
Tue May 20 15:17:49 UTC 2008




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

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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