Hi,
If the UAC receives the 487 and can't fallback to the pre-reINVITE state, it
sends a new re-INVITE with something that it DOES supports. That is also
described in Gonzalo's draft, I belive.
And, you could have the same problem if the target refresh was done already in
the re-INVITE/18x. If the UAC then sends CANCEL, and can't fall back, it will
have to send a new re-INVITE.
I also think it is bad practise to do a target refresh in a nested UPDATE, but
that's a separate issue.
Regards,
Christer
________________________________
From: [email protected] [mailto:[email protected]]
Sent: 12. maaliskuuta 2009 9:41
To: Christer Holmberg
Cc: Gonzalo Camarillo; SIP; SIPPING
Subject: 答复: RE: One chart //"UPDATE during Re-INVITE" discussion
Hi,
I just mean that if we treat F3 as sub-transaction of F1, then after
F7(ACK), UAC can discard refreshed dialog state in F3.
And it may make the two parts can not communicate anymore in current
dialog.
And IMO, this is a counterevidence for treating all UPDATE(during
Re-INVITE) as sub-transaction of Re-INVITE.
Gao
"Christer Holmberg" <[email protected]>
2009-03-12 15:31
收件人
<[email protected]>, "SIP" <[email protected]>, "SIPPING" <[email protected]>
抄送
"Gonzalo Camarillo" <[email protected]>
主题
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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