Hi,
 
I have a remark on note in chapter 4. User Agent Client Behaviour  of  draft-ietf-simple-im-session-00.txt
 
It says that it's not allowed to omit MESSAGE media session from INVITE as there is likelyhood that UAS will not propose the MESSAGE media.
But for 3PCC application, it would be very useful. And I think that in the case of 3PCC, there is good that MESSAGE session is proposed by UAS in 200 OK. 
In case of 3PCC UAS is a SIP end device, while UAC (which sends INVITE) is controller of 3PCC. So it is obvious that the entity which will want to send MESSAGEs is UAS and that's why it should propose media. And it can do it in 200 OK.
 
Could somebody involved confirm this?
 
Regards,
 
Jirka

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