Same uri as in Invite. Here is text from RFC 3261:
UACs creating an ACK message will duplicate all of the Authorization and
Proxy-Authorization header  field values that appeared in the INVITE to
which the ACK corresponds. 

Sanjay

>-----Original Message-----
>From: [EMAIL PROTECTED] 
>[mailto:[EMAIL PROTECTED] On Behalf Of 
>Igor Vanin
>Sent: Monday, October 09, 2006 9:30 AM
>To: [email protected]
>Subject: [Sip-implementors] uri parameter of Authorization 
>header field inACK request
>
>Hello, All
>
>Which URI should I use in "uri" parameter of Authorization 
>header field in ACK request after 200 response from server: 
>the same URI as in INVITE request or new Request-URI obtained 
>from Contact HF of 200 response?
>
>After INVITE/401/ACK transaction, my softphone sends to the 
>Proxy an INVITE request with the following lines:
>
>INVITE sip:[EMAIL PROTECTED] SIP/2.0
>To: <sip:[EMAIL PROTECTED]>
>Authorization: Digest 
>username="testcaller",realm="sip.example.com",nonce="55555",uri
>="sip:[EMAIL PROTECTED]",response="[skippedmyfirstresponse]"
>
>Then I receive 200 response from server:
>
>SIP/2.0 200 OK
>To: <sip:[EMAIL PROTECTED]>;tag=111
>Contact: <sip:[EMAIL PROTECTED]:5060>
>
>Then the UAC core generates ACK request with updated Request-URI:
>
>ACK sip:[EMAIL PROTECTED] SIP/2.0
>To: <sip:[EMAIL PROTECTED]>;tag=111
>Which Authorization header field is correct?
>This:
>Authorization: Digest 
>username="testcaller",realm="sip.example.com",nonce="55555",uri
>="sip:[EMAIL PROTECTED]",response="[skippedmysecondresponse]"
>or this:
>Authorization: Digest 
>username="testcaller",realm="sip.example.com",nonce="55555",uri
>="sip:[EMAIL PROTECTED]:5060",response="[skippedmysecondresponse]"
>?
>
>RFC-3261 claims that the ACK MUST contain the same credentials 
>as the INVITE. Is the "uri" parameter the part of 
>"credentials", or it should match the Request-URI of each request?
>
>--
>With best regards, Igor Vanin, St. Petersburg, Russia 
>mailto:[EMAIL PROTECTED]  http://gpmail.spb.ru 
>
>
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