Re: One chart //"UPDATE during Re-INVITE" discussion

In my opinion 487 should trigger whatever actions/rollback that any other non-200 response sent by the UAS would.
 
Regards,
 
Christer


________________________________

	From: [email protected] [mailto:[email protected]] 
	Sent: 12. maaliskuuta 2009 5:47
	To: SIP; SIPPING
	Cc: Christer Holmberg; Gonzalo Camarillo
	Subject: One chart //"UPDATE during Re-INVITE" discussion
	
	

	      UAC                   UAS 
	       | session established | 
	       |<===================>| 
	       |                     | 
	       | F1  re-INVITE (SDP) | 
	       |-------------------->| 
	       | F2 1xx-rel (SDP)    | 
	       |<--------------------| 
	       | F3   UPDATE         | 
	       |<--------------------| Target refreshing 
	       | F4 2xx UPT          | 
	       |-------------------->| 
	       |                     | 
	       | F5/6 Cancel/200OK   | 
	       |-------------------->| 
	       | F7    487 INV       | 
	       |<--------------------| 
	       | F7     ACK          | 
	       |-------------------->| 
	       | F8  re-INVITE (SDP) | 
	       |-------------------->| Using which dialog state 
	
	F3/F4 is about target refreshing. 
	
	And if UAC sends Cancel， UAS sends 487. The first Re-INVITE is discarded. 
	
	But if UAC sends another Re-INVITE, which dialog state should it use? 
	
	I think is the one refreshed by F3. That's the merit of regarding UPDATE/200OK's atomicity. 
	
	
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