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

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


From: gao.yang2@xxxxxxxxxx [mailto:gao.yang2@xxxxxxxxxx]
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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