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In RFC3261, there are scenarios about UAS-to-UAC
authentication (by using 401 response) and Proxy-to-User authentication (by
using 407 response). Is it possible to let the UAC authenticate the UAS? For
example, the caller invites the callee, but he wants that person, who is
currently using the callee's terminal, to provide authentication information.
The combination of "www-authenticate" and "Authentication" can't be used here
since the former header is carried by a response and the latter one by a
request.
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