20.28 Proxy-Authorization

   The Proxy-Authorization header field allows the client to identify
   itself (or its user) to a proxy that requires authentication.  A
   Proxy-Authorization field value consists of credentials containing
   the authentication information of the user agent for the proxy and/or
   realm of the resource being requested.

   See Section 22.3 for a definition of the usage of this header field.

   This header field, along with Authorization, breaks the general rules
   about multiple header field names.  Although not a comma-separated
   list, this header field name may be present multiple times, and MUST
   NOT be combined into a single header line using the usual rules
   described in Section 7.3.1.

   Example:

   Proxy-Authorization: Digest username="Alice", realm="atlanta.com",
      nonce="c60f3082ee1212b402a21831ae",
      response="245f23415f11432b3434341c022"

20.29 Proxy-Require

   The Proxy-Require header field is used to indicate proxy-sensitive
   features that must be supported by the proxy.  See Section 20.32 for
   more details on the mechanics of this message and a usage example.

   Example:

      Proxy-Require: foo

20.30 Record-Route

   The Record-Route header field is inserted by proxies in a request to
   force future requests in the dialog to be routed through the proxy.

   Examples of its use with the Route header field are described in
   Sections 16.12.1.

   Example:

      Record-Route: <sip:server10.biloxi.com;lr>,
                    <sip:bigbox3.site3.atlanta.com;lr>

20.31 Reply-To

   The Reply-To header field contains a logical return URI that may be
   different from the From header field.  For example, the URI MAY be
   used to return missed calls or unestablished sessions.  If the user
   wished to remain anonymous, the header field SHOULD either be omitted
   from the request or populated in such a way that does not reveal any
   private information.

   Even if the "display-name" is empty, the "name-addr" form MUST be
   used if the "addr-spec" contains a comma, question mark, or
   semicolon.  Syntax issues are discussed in Section 7.3.1.

   Example:

      Reply-To: Bob <sip:
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