20.27 Proxy-Authenticate

   A Proxy-Authenticate header field value contains an authentication
   challenge.

   The use of this header field is defined in [H14.33].  See Section
   22.3 for further details on its usage.


      Proxy-Authenticate: Digest realm="atlanta.com",
       domain="sip:ss1.carrier.com", qop="auth",
       nonce="f84f1cec41e6cbe5aea9c8e88d359",
       opaque="", stale=FALSE, algorithm=MD5

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