Subject: [Sip] authentication

From: Sean Tang <[email-masked]>
Date: Mon, 22 Oct 2001 16:26:27 -0400

If proxy server and user agent server both need to do authentication :

UAC send INVITE to proxy, proxy send back 407 with a challenge. 
then UAC send a new INVITE with the credentials. Proxy forward this
invite to UA server. UA server send back 401 with another challenge,
UAC send a new INVITE with a new credentials, then proxy send back 
407. So the double authentication never gonna succeed ?

What is the solution to this scenaris ?

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