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List:       sip-implementors
Subject:    [Sip-implementors] 181 Call Is Being Forwarded
From:       Neumaerker Elke <elke.neumaerker () siemens ! com>
Date:       2003-01-30 15:36:07
Message-ID: AD1ACF6AE5DCD611B83C0002A58EDACD19A98C () MCHH2C2E
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Hello,


who sends the response 181 (Call Is Being Forwarded) ?

I assume, that a proxy-server should send the 181, if he resolves a 302 from a UAS. 
So the UAC is informed about the redirection and may terminate the call setup, if he \
want. 

I did not found a description related to the 302/ 181 topic in the RFC 3261 or any \
call flow in related documents. 

In the draft-ietf-sipping-isup-* the mapping of messages from SIP to ISUP is \
described.  If a SIP->PSTN call is forwarded inside the PSTN, a CPG + code=6  is sent \
back to the gateway and a 181 is generated back to the UAC.  I assume, the protocol \
should be symmetric, but I have never seen a SIP-phones sending a 181, but only 302.  \
So I assume, the proxy should generate the 181, because he decided to call a B-site \
with address received in the 302 response.  

-------------------------------
Thanks. 
Elke Neumärker


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