code: function writeConferenceCreateRequest (userData) {
      var userDataStream = new type.Stream(userData.size());
      userData.write(userDataStream);
      
      return new type.Component([
  	    per.writeChoice(0), per.writeObjectIdentifier(t124_02_98_oid),
  	    per.writeLength(userData.size() + 14), per.writeChoice(0),
  	    per.writeSelection(0x08), per.writeNumericString("1", 1), per.writePadding(1),
  	    per.writeNumberOfSet(1), per.writeChoice(0xc0),
  	    per.writeOctetStream(new Buffer(h221_cs_key), 4), per.writeOctetStream(userDataStream.getValue())
      ]);
  }
docs: Built {type.Componen} from gcc user data
  @param userData {type.Component} GCC data from client
  @returns {type.Component} GCC encoded client user data