My proposal has no racing condition
1 UPDATE and 4xx/5xx/6xx of Re-INVITE
UAC UAS
| session established |
|<===================>|
| |
| F1 re-INVITE (SDP) |
|-------------------->|
| F2 1xx-rel (SDP) |
|<--------------------|
| F3 PRACK |
|-------------------->|
| F4 2xx PRA |
|<--------------------|
| |
|F5 UPDATE F6 4xx INV |
|---------\ /--------|
| \/ |
| /\ |
|<--------/ \------->|
| |
Currently, there are only two cases for the Offer in UPDATE:
o part of the original modification;
o a new modification request.
If it is part of the original modification, the session state is clear. That
is the state before F1.
If it is a new modification request, there are only two cases for the
UPDATE:
o accepted by 200OK;
o rejected by 4xx/5xx/6xx, such as 504.
If it is accepted by 200OK, the new modification is committed. And
the session state is committed state of the modification triggered by
F5.
If it is rejected, and the original modification failed, the session state is one before F1.
-------------------------------------------------------- ZTE Information Security Notice: The information contained in this mail is solely property of the sender's organization. This mail communication is confidential. Recipients named above are obligated to maintain secrecy and are not permitted to disclose the contents of this communication to others. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. Any views expressed in this message are those of the individual sender. This message has been scanned for viruses and Spam by ZTE Anti-Spam system.
_______________________________________________ Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping This list is for NEW development of the application of SIP Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip Use sip@xxxxxxxx for new developments of core SIP
