fix issues with Progress message type if pre_answer enabled

src/mod/endpoints/mod_h323/changes.txt

+fix issues with Progress message type if pre_answer enabled
 fix crashes on FSH323Connection calls in on_hangup routine in different threads.
 move PTrace level set to FSH323EndPoint::Initialise
 partially apply patch from from Peter Olsson, Remove UnLock() when TryLock() failed and DEBUG_RTP_PACKETS directive.

src/mod/endpoints/mod_h323/mod_h323.cpp

@@ -1148,7 +1148,7 @@ void FSH323Connection::AnsweringCall(AnswerCallResponse response)
 			if (!mediaWaitForConnect) {
 				// create a new facility PDU if doing AnswerDeferredWithMedia
 				H323SignalPDU want245PDU;
-				//H225_Progress_UUIE & prog = want245PDU.BuildProgress(*this);
+				want245PDU.BuildProgress(*this);
 				PBoolean sendPDU = TRUE;
 				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE,"mediaWaitForConnect = FALSE\n");
 /*				if (SendFastStartAcknowledge(prog.m_fastStart)){