Subject: RE: [Sip] opaque field in proxy authentication header

From: "Attila Sipos" <[email-masked]>
Date: Fri, 3 Aug 2007 15:56:05 +0100

Because the opaque has to be returned, it can be used transport
anything back to the challenger.
 
>From RFC 2617:
 
   Because the client is required to return the value of the opaque
   directive given to it by the server for the duration of a session,
   the opaque data may be used to transport authentication session state
   information. 
 
It is up to the generator of the Authenticate challenge to decide
what to use this opaque field for.
 
It could be, for example, some kind of stateful information required
by a stateless proxy.
 
Regards,
 
Attila

________________________________

From: sengottuvelan srirangan [mailto:[email-masked]] 
Sent: 03 August 2007 14:24
To: [email-masked]
Subject: [Sip] opaque field in proxy authentication header

Hi SIP experts,
 
I don't understand about the usage of opaque field in SIP proxy
authentication headers. For example.
 
      Proxy-Authenticate: Digest realm="atlanta.com",
       domain="sip:ss1.carrier.com", qop="auth",
       nonce="f84f1cec41e6cbe5aea9c8e88d359",
       opaque="", stale=FALSE, algorithm=MD5
 
could you please anyone clarify the opaque field with an example?
 
Thanks in adavance.
 
Regards
Sengottuvelan

________________________________

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