8. Augmented BNF

   This section provides the augmented Backus-Naur Form (BNF) of both
   parameters described above.

   The compression URI parameter is a "uri-parameter", as defined by the
   SIP ABNF (Section 25.1 of [1]):

      compression-param  =  "comp=" ("sigcomp" / other-compression)
      other-compression  =  token

   The Via compression parameter is a "via-extension", as defined by the
   SIP ABNF (Section 25.1 of [1]):

      via-compression    =  "comp" EQUAL ("sigcomp" / other-compression)
      other-compression  =  token