Two interpretations are around for Re-invite without SDP.
1) Return the Currently Negotiated SDP which  is recv only
2) Treat that as a new SDP negotiation and return the full capabilities 
(with send-recv etc).

I think the second option is more generic.

Kasturi

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 
Sent: Wednesday, November 15, 2006 8:47 PM
To: [email protected]
Subject: [Sip-implementors] INV without sdp

Hi ALL:

I'm a newbie of sip implementation. Here is a question about invite 
request
without sdp.

After Caller A and Callee B construct a dialog, A sends a re-invite 
request
with sdp indicates "sendony" to hold B. B responses 200 OK with sdp
indicated "receonly" correctly. If at this moment,  A sends a re-invite
again but without sdp, how does B response in sdp? sendrece? receonly?

Is there any sections in any RFCs defines the behavior described here?

Thanks you all.

BR,
Johnny
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