Hi Will,
Since in this case already 180 is received, transaction will not
generate 408 response.
Also, if you see the Timer C handling in proxy, if Timer C fires, one option
says to send out cancel
and wait for sometime and if cancel response is not received, then proxy
will generate 487 response
and sends it upstream.
As you said, proxy can modify To tag in 3xx-6xx response and it will
not effect the upstream
Proxies as per RFC 3261 quote. So, I think your case is valid.
"While it makes no difference to the upstream elements if the
proxy replaced the To tag in a forwarded 3-6xx response,
preserving the original tag may assist with debugging."
Regards,
Manju
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-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Will Quan
Sent: Thursday, March 29, 2007 3:18 AM
To: [email protected]
Subject: [Sip-implementors] 408 Request Timeout
Question about the To-tag in a 408 response initiated on a stateful proxy.A
stateful proxy forwards INVITE to terminating client, who respondes with 180
(with To-tag). The UA is then is unplugged (network isolated) such that he
can not send a final response back to the proxy. Later, (~3min) proxy
Timer-C expires and now (acting like UAS) sends the 408 response, but uses a
*new* To-tag.Should this to-tag be the same as from the 180 ringing, or can
it be a new one?I read through the passage below, and it looks to like it
can be a new to-tag since1. hop-by-hop2. 408 is not being forwarded from the
terminating side.Am I wrong
here?http://tools.ietf.org/html/rfc3261#section-16.7<<SNIP form 3261 16.7>>
3-6xx responses are delivered hop-by-hop. When issuing a 3-6xx
response, the element is effectively acting as a UAS, issuing its
own response, usually based on the responses received from
downstream elements. An element SHOULD preserve the To tag whe
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