Subject: [Ecrit] Data Only Emergency Call

From: Hannes Tschofenig <[email-masked]>
Date: Wed, 16 Nov 2011 22:54:16 +0800

Hi all,

we had a fairly good discussion today and here are my impressions from the discussions. 

First, we had the question about what SIP messages to use for conveying the CAP payloads. 
There, we had suggested to focus on the INVITE and on the MESSAGE method. 

Brian proposed that we use MESSAGE for a one-shot message that does not require any session semantic. 

For those cases where either additionally voice/video is conveyed then the INVITE is used. 

Do I miss something?

Then, there was the question where to put the CAP? We suggested that we need to put the CAP in the body of the MESSAGE and the INVITE. 
We also said that we would not need a CID in the header to point to the CAP payload in the body. 

Finally, we had a discussion about the integration of the “additional data” with “data-only”. When we send a  SIP INVITE or SIP MESSAGE then we 
- MUST attach the additional data structure, and
- MAY add a CAP payload (as described in this document if needed).

Then, there is also the PIDF-LO for the location. 

Comments appreciated!

Ciao
Hannes