Hi Udit,

There Must be one "C" field at the session level (or) one "C" field in each 
media description level.
"C" value at the session level is like global value.and  Media level is like 
local.
so if you do not have it in Media level it will take the value at Session level.

so  to your question:
Yes it is valid.
It is indicating different Ip addresses for different Media types.

If you want a particular media stream to be in holding give that IP address for 
that particular Media stream  "c"  (to 0.0.0.0 or a=inactive)

HTH,

Regards,
Sreeram.

________________________________

From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED]
Sent: Wed 8/24/2005 4:11 PM
To: SIP Implementors
Cc: SIP IETF
Subject: [Sip] SDP Query



Hi,

Just want to check if following SDP is valid:

        c=IN IP4 224.2.17.12/127
        t=2873397496 2873404696
        a=recvonly
        m=audio 49170 RTP/AVP 0
        c=IN IP4 224.2.17.13/127
        m=video 51372 RTP/AVP 31

It indicates different IP address used for audio and video types.

I thought the reason we have connection parameter in both session and media 
description is for handling hold cases, where you want to hold a particular set 
of media instead of whole session.

Regards,
Udit





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