Hi Mahesh,
Background: RFC 2543 supports strict routing and RFC 3261 supports
loose routing. For the backward compatibility for RFC 3261 implementors that
line is the guideline.
If lr is present in the route header then that entity supports loose
routing else strict routing.
Thumb Rule of strict route(SR):
Entity receiving a message with SR support MUST have its self address in
the req-uri of SIP message otherwise it decline that message thinking its
not intended for it.
Passage says how to process a request in case of 3261 Proxy before
forwarding. Suppose you have 3 proxies
3261UAC 3261Proxy1 2543Proxy2
3261Proxy3 3261UAS
INVITE INVITE INVITE
INVITE INVITE
Req-Uri:<sip:UAS;lr> Req-Uri:<sip:P2> Req-Uri:<sip:P3;lr>
Req-Uri:<sip:UAS;lr>
Route:<sip:P1;lr>, Route:<sip:P3;lr>, Route:<sip:UAS;lr>
<<No Route Header>>
<sip:P2>,<sip:P3;lr> <sip:UAS;lr>
Above example shows how the req-uri and route header of an INV message is
handled in 3261 n 2543 based SIP entities.
Hope this helps!!!
regards,
Manju
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-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mahesh
Pidshetti
Sent: Friday, January 18, 2008 11:33 AM
To: [email protected]
Subject: [Sip-implementors] [URGENT] Meaning of the Passage in
ScriptSIP_CC_PR_MP_RQ_V_015
Dear Sip Geeks,
I am not understanding the clear picture of what the following means:
"Ensure that the IUT on receipt of an INVITE request with a Route header,
and the first URI of this Route does not contain a lr parameter, put the
Request-URI into the last position of the Route header, and put the first
value of the Route header into the Request-URI, and then forwards the
message."
Please assist me in this regard, its deadly require test case.
Also If possible please give me a small script, just outline is sufficient.
Thanks a lot in advance.
-
Mahesh
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