yes, you can have multiple Proxy-Authenticate headers.
 
You might be able to store the response provided the challenge
hasn't changed.  I'm not sure.
 
But you could definitely just recalculate both authentication
responses (so you wouldn't have to store anything).
For the user being challenged you'd just have separate
passwords for each realm ( I assume the Proxy-Authenticate
headers would have different realms)
 
Regards,
 
Attila
 
 

        -----Original Message----- 
        From: [EMAIL PROTECTED] on behalf of [EMAIL PROTECTED] 
        Sent: Wed 24/01/2007 19:51 
        To: SIP Implementors 
        Cc: 
        Subject: [Sip-implementors] Regarding authentication
        
        

        Hi,
        
        Can UAC receive 407 response with multiple Proxy-authenticate headers?
        
        As per RFC 3665 Section 3.3. flow, for multiple proxy authentication 
flow,
        when proxy 2 challenges the request, proxy 1 sends 407 back to UAC with
        only one Proxy-authenticate header containing the challenge of only 
proxy
        2.
        
        Is it responsibility of UAC to store the previous Proxy-Authorization 
that
        it sent to proxy 1, and when it receives 407 again from proxy1 with
        different challenge, sends the collated invite with both authorization
        headers.
        
        Regards,
        Udit
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