Because the realm in second 407 will be second proxy's domain 
 

>-----Original Message-----
>From: [EMAIL PROTECTED] 
>[mailto:[EMAIL PROTECTED] On Behalf Of 
>[EMAIL PROTECTED]
>Sent: Wednesday, January 24, 2007 5:41 PM
>To: Attila Sipos
>Cc: SIP Implementors
>Subject: Re: [Sip-implementors] Regarding authentication
>
>But as per Section 3.3 flow of RFC 3665, second 407 contains 
>only one Proxy-authenticate header and not two headers, so how 
>will UA know that he has to send two Proxy-Authorization 
>headers in INVITE message.
>
>Am I missing something?
>
>
>
>
>"Attila Sipos" <[EMAIL PROTECTED]>
>01/24/2007 05:26 PM
>
>To
>Udit Goyal/C/IN/[EMAIL PROTECTED], "SIP Implementors" 
><[email protected]>
>cc
>
>Subject
>RE: [Sip-implementors] Regarding authentication
>
>
>
>
>
>
>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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