Hi,
I have looked into RFC 4317 (SDP Offer/Answer Examples), but I could not
find example related to this issue.
I know that some vendors do use the MaxBR field. Where can I find the
payload specification?

Thanks,
Erez

-----Original Message-----
From: Even, Roni [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, January 17, 2006 9:51 AM
To: Erez Morabia; [email protected]
Subject: RE: [Sip-implementors] Asymmetric media format

Hi,
I think it is OK. 
The problem I see is with the MaxBR field. I am not aware that it is in
the payload specification. 
You should use b=AS:440 or b=TIAS:440000 for each m line
Roni Even

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Erez
Morabia
Sent: Tuesday, January 17, 2006 8:23 AM
To: [email protected]
Subject: [Sip-implementors] Asymmetric media format

Hi,
Suppose I want to announce different format parameters for the receive
direction and for the transmit direction.
For example,
Receive : QCIF, 110Kbps, 15fps
Transmit: CIF, 440Kbps, 30fps

Is there a way for doing it?

The only thing I can think of is:
 m=video 6794 RTP/AVP 31
 a=rtpmap:31 H261/90000
 a=fmtp:31 CIF=1/MaxBR=4400
 a=sendonly
 m=video 6794 RTP/AVP 31
 a=rtpmap:31 H261/90000
 a=fmtp:31 QCIF=2/MaxBR=1100
 a=recvonly

Thanks,
Erez


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