Parses the String message.
if (debug) dbg_enter("parse");
try {
this.lexer.match(TokenTypes.CALL_ID);
this.lexer.SPorHT();
this.lexer.match(':");
this.lexer.SPorHT();
CallIdHeader callID = new CallIdHeader();
this.lexer.SPorHT();
String rest = lexer.getRest();
callID.setCallId(rest.trim());
return callID;
}finally {
if (debug) dbg_leave("parse");
}