Hi King,
In my opinion,
404: user not found in the domain
480: user is found in the domain, but not logged in (Proxy replies)
or user is not available to accept the call by now, but you can try later.
(Client replies)
Correct me if not.
Regards
Pang Xiaogang
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of King Yu
Sent: Monday, April 26, 2004 2:07 PM
To: [EMAIL PROTECTED]
Subject: [Sip-implementors] 404 versus 480
The last two paragraphs in RFC 3261 section 16.5 says:
"If the Request-URI indicates a resource at this proxy that does not
exist, the proxy MUST return a 404 (Not Found) response.
If the target set remains empty after applying all of the above, the
proxy MUST return an error response,
which SHOULD be the 480 (Temporarily Unavailable) response."
My interpretation of this is that if the domain of the Request-URI
indicates a domain this proxy is responsible for, but lookup (but
location service, and other local policies) failed, then we return 404.
My question is, when would we ever encounter a case where we should
return 480? If the domain of the Request-URI is external (this proxy is
NOT responsible for), we would have forwarded the request to that
external domain immediately (section 16.5 paragraph 3).
Thanks.
King
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