Re: [Sip] One chart //"UPDATE during Re-INVITE" discussion

gaoyang <gao.yang.seu@xxxxxxxxxxx> · Thu, 12 Mar 2009 13:36:16 +0000

Hi,

I have same thought about it as yours. 

But in Ganzalo's draft, the new dialog state MUST be discarded by 4xx of Re-INVITE.

The main branching is about the relationship of Re-INVITE and UPDATE. I have seen your supporting of view 2. Abd we need more people to show their standpoint.

Gao

From: brett@xxxxxxxxxxxxx
To: gao.yang2@xxxxxxxxxx; sip@xxxxxxxx; sipping@xxxxxxxx
Date: Thu, 12 Mar 2009 04:57:06 -0700
Subject: Re:  [Sip] One chart //"UPDATE during Re-INVITE" discussion

Data (like Contact, Session-Expires, and etcetera) that was successfully updated by F3/F4 still apply after F7.  Thus F8 data should reflect (and can attempt to modify) adjustments made during F3/F4.

From: sip-bounces@xxxxxxxx [mailto:sip-bounces@xxxxxxxx] On Behalf Of gao.yang2@xxxxxxxxxx
Sent: Wednesday, March 11, 2009 11:47 PM
To: SIP; SIPPING
Cc: Gonzalo Camarillo; Christer Holmberg
Subject: [Sip] One chart //"UPDATE during Re-INVITE" discussion

      UAC                   UAS 
       | session established | 
       |<===================>| 
       |                     | 
       | F1  re-INVITE (SDP) | 
       |-------------------->| 
&nbs
 p;      | 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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