public StringBuilder encodeBody(StringBuilder retval){
  if (callId == null)   return retval;
 else {
    retval.append(callId);
    if (!parameters.isEmpty()) {
      retval.append(SEMICOLON);
      parameters.encode(retval);
    }
    return retval;
  }
}

public StringBuilder encodeBody ( StringBuilder retval ) { if ( callId == null ) return retval ; else { retval . append ( callId ) ; if ( ! parameters . isEmpty ( ) ) { retval . append ( SEMICOLON ) ; parameters . encode ( retval ) ; } return retval ; } }
encode the body part of this header ( i . e . leave out the hdrname ) .
