[SIPForum-discussion] Proxy-to-User Authentication

[Martin Weiglhofer]

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Dear all,

assume, that a user tries to register a contact address on a registrar
which requires authentication, but the user is not known by the
registrar. The user sends a REGISTER message (without authentication
credentials) which is answered with a "401 Unauthorized" response. Now
the user sends a second REGISTER request which includes an Authorization
header field. What should be the response of the server to the second
REGISTER request? Should the registrar again reply with a "401
Unauthorized", or should the registrar reject the request with a "404
Not Found"?

Thanks in advance.

Regards
Martin

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