20.1 Accept

   The Accept header field follows the syntax defined in [H14.1].  The
   semantics are also identical, with the exception that if no Accept
   header field is present, the server SHOULD assume a default value of
   application/sdp.

   An empty Accept header field means that no formats are acceptable.


   Example:

      Header field          where   proxy ACK BYE CAN INV OPT REG
      ___________________________________________________________
      Accept                  R            -   o   -   o   m*  o
      Accept                 2xx           -   -   -   o   m*  o
      Accept                 415           -   c   -   c   c   c
      Accept-Encoding         R            -   o   -   o   o   o
      Accept-Encoding        2xx           -   -   -   o   m*  o
      Accept-Encoding        415           -   c   -   c   c   c
      Accept-Language         R            -   o   -   o   o   o
      Accept-Language        2xx           -   -   -   o   m*  o
      Accept-Language        415           -   c   -   c   c   c
      Alert-Info              R      ar    -   -   -   o   -   -
      Alert-Info             180     ar    -   -   -   o   -   -
      Allow                   R            -   o   -   o   o   o
      Allow                  2xx           -   o   -   m*  m*  o
      Allow                   r            -   o   -   o   o   o
      Allow                  405           -   m   -   m   m   m
      Authentication-Info    2xx           -   o   -   o   o   o
      Authorization           R            o   o   o   o   o   o
      Call-ID                 c       r    m   m   m   m   m   m
      Call-Info                      ar    -   -   -   o   o   o
      Contact                 R            o   -   -   m   o   o
      Contact                1xx           -   -   -   o   -   -
      Contact                2xx           -   -   -   m   o   o
      Contact                3xx      d    -   o   -   o   o   o
      Contact                485           -   o   -   o   o   o
      Content-Disposition                  o   o   -   o   o   o
      Content-Encoding                     o   o   -   o   o   o
      Content-Language                     o   o   -   o   o   o
      Content-Length                 ar    t   t   t   t   t   t
      Content-Type                         *   *   -   *   *   *
      CSeq                    c       r    m   m   m   m   m   m
      Date                            a    o   o   o   o   o   o
      Error-Info           300-699    a    -   o   o   o   o   o
      Expires                              -   -   -   o   -   o
      From                    c       r    m   m   m   m   m   m
      In-Reply-To             R            -   -   -   o   -   -
      Max-Forwards            R      amr   m   m   m   m   m   m
      Min-Expires            423           -   -   -   -   -   m
      MIME-Version                         o   o   -   o   o   o
      Organization                   ar    -   -   -   o   o   o

             Table 2: Summary of header fields, A--O

   Header field              where       proxy ACK BYE CAN INV OPT REG
   ___________________________________________________________________
   Priority                    R          ar    -   -   -   o   -   -
   Proxy-Authenticate         407         ar    -   m   -   m   m   m
   Proxy-Authenticate         401         ar    -   o   o   o   o   o
   Proxy-Authorization         R          dr    o   o   -   o   o   o
   Proxy-Require               R          ar    -   o   -   o   o   o
   Record-Route                R          ar    o   o   o   o   o   -
   Record-Route             2xx,18x       mr    -   o   o   o   o   -
   Reply-To                                     -   -   -   o   -   -
   Require                                ar    -   c   -   c   c   c
   Retry-After          404,413,480,486         -   o   o   o   o   o
                            500,503             -   o   o   o   o   o
                            600,603             -   o   o   o   o   o
   Route                       R          adr   c   c   c   c   c   c
   Server                      r                -   o   o   o   o   o
   Subject                     R                -   -   -   o   -   -
   Supported                   R                -   o   o   m*  o   o
   Supported                  2xx               -   o   o   m*  m*  o
   Timestamp                                    o   o   o   o   o   o
   To                        c(1)          r    m   m   m   m   m   m
   Unsupported                420               -   m   -   m   m   m
   User-Agent                                   o   o   o   o   o   o
   Via                         R          amr   m   m   m   m   m   m
   Via                        rc          dr    m   m   m   m   m   m
   Warning                     r                -   o   o   o   o   o
   WWW-Authenticate           401         ar    -   m   -   m   m   m
   WWW-Authenticate           407         ar    -   o   -   o   o   o

   Table 3: Summary of header fields, P--Z; (1): copied with possible
   addition of tag

      Accept: application/sdp;level=1, application/x-private, text/html

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