Subject: [SIP] doubt on using sdp

From: "Manish S. Jalan" <[email-masked]>
Date: 23 Apr 2001 06:37:54 -0000

Hello everyone,

I have a query on using sdp while establishing a session using sip.

I want to use G.723 encoding for the rtp.
Hence in the media description, I'll give

m=audio 12345 RTP/AVP 4
a=rtpmap:4 G723/8000
a=fmtp bitrate=6300

My query is: 
G.723 is a dual rate encoding scheme. One at 5.3Kbps and another at 6.3 Kbps.
In the sdp definition above, I have specified, my capability for the 6.3 Kbps G.723 encoding.
Say, if I have the capability of supporting 5.3 Kbps also.
Then, how do i indicate that, i support both.
Simply by an additional fmtp line, or some other mechanism.

Eagerly waiting for your help. Thanks in advance.

Regards,
-Manish S. Jalan

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