Hi Roman,
The INVITE server transaction should not terminate when it sends out a 2xx , it should go into completed state and wait for ACK to go into CONFIRMED state, then it waits for Timer I before it terminates. This should handle your issue of retransmitted INVITE's . 500 response should be sent for the retransmitted invites.
Regards, Sunil.
[EMAIL PROTECTED] wrote:
Hi Roman, It seems this UAC is not stopping Timer A after receiving provisional response. UAC should not retransmit the invite in "proceeding" state. Re-Invite is possible. Vivek
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roman Shpount Sent: Tuesday, August 17, 2004 4:30 AM To: [EMAIL PROTECTED] Subject: [Sip-implementors] Problem with an intial SIP INVITE servertransaction.
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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