[SIPForum-discussion] Early Media

[Siva M-Q16748]

Hi

If the 183 and 200 OK should have same SDP . How does the following
scenario work ?? 

A calls ( throgh a B2BUA AS) B
B doesnot answer
Application Server sends INVITE to Media Server
Application Server sends the SDP info he got from Media Server to A in
the 183 message
A gets a Music played by media Server
Now Application server forwards the call to C
If C answers , A should get the SDP info of C ( I thought it would be
sent in 200 OK )

If 200 OK sent to A should have the same SDP as that of 183 , How can A
and C talk in this case ..

Thanks
Siva M 

-----Original Message-----
From: Robert Mansfield [mailto:RJM at Redwoodtech.com] 
Sent: Thursday, April 19, 2007 1:54 PM
To: Siva M-Q16748
Subject: RE: [SIPForum-discussion] Early Media

Siva,

I'm not 100% sure but my understanding is that the early media WILL
contain the same SDP descriptor as the 200 OK. There is a
'early-session' header (look at RFC 3959 and 3960 for some guidance)
that is used in an Application Server model for early media. This allows
for different SDP descriptors during session establishment.

>From my experience with PSTN-SIP Gateways (Gateway model) the descriptor
will be the same.

Rob.

-----Original Message-----
From: Siva M-Q16748 [mailto:sivam at motorola.com]
Sent: 19 April 2007 06:49
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Early Media


 
Hi

In case of Early Media for announcements

Can 183 and 200OK have different SDP info 

Thanks
Siva M 

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