I run into the problem with handling of retransmitted SIP INVITE message based on the 
RFC 3621. 

Imagine the following situation

INVITE 1
----------------------->
100
<-----------------------
2XX
<-----------------------
re-transmitted INVITE 1
----------------------->

Based on RFC 3261, server INVITE transaction terminates as soon as 2XX response is 
sent. This means that re-transmitted INVITE will be treated as a new transaction. This 
INVITE message will not match the existing dialog, since its To tag is empty. This 
means it will be treated as new dialog creating message and phone will treat this 
message as a new call, which is clearly not intended.

___________________________________
Roman Shpount, VP of Technology
aTelo, Inc. -- www.atelo.com






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