C++ TransactionEntry::T303方法代码示例

void Control::MTCStarter(TransactionEntry& transaction, LogicalChannel *LCH)
{
	assert(LCH);
	LOG(INFO) << "MTC on " << LCH->type() << " transaction: "<< transaction;

	// Determine if very early assigment already happened.
	bool veryEarly = false;
	if (LCH->type()==FACCHType) veryEarly=true;

	// Allocate a TCH for the call.
	TCHFACCHLogicalChannel *TCH = NULL;
	if (!veryEarly) {
		TCH = allocateTCH(dynamic_cast<SDCCHLogicalChannel*>(LCH));
		// It's OK to just return on failure; allocateTCH cleaned up already.
		// The orphaned transaction will be cleared automatically later.
		if (TCH==NULL) return;
	}


	// Get transaction identifiers.
	// This transaction was created by the SIPInterface when it
	// processed the INVITE that started this call.
	if (!veryEarly) TCH->transactionID(transaction.ID());	
	LCH->transactionID(transaction.ID());	
	unsigned L3TI = transaction.TIValue();
	assert(transaction.TIFlag()==1);

	// GSM 04.08 5.2.2.1
	LOG(INFO) << "sending GSM Setup to call " << transaction.calling();
	LCH->send(L3Setup(0,L3TI,L3CallingPartyBCDNumber(transaction.calling())));
	transaction.T303().set();
	transaction.Q931State(TransactionEntry::CallPresent);
	gTransactionTable.update(transaction);

	// Wait for Call Confirmed message.
	LOG(DEBUG) << "wait for GSM Call Confirmed";
	while (transaction.Q931State()!=TransactionEntry::MTCConfirmed) {
		if (transaction.SIP().MTCSendTrying()==SIP::Fail) {
			LOG(NOTICE) << "call failed on SIP side";
			LCH->send(RELEASE);
			// Cause 0x03 is "no route to destination"
			return abortCall(transaction,LCH,L3Cause(0x03));
		}
		// FIXME -- What's the proper timeout here?
		// It's the SIP TRYING timeout, whatever that is.
		if (updateGSMSignalling(transaction,LCH,1000)) {
			LOG(INFO) << "Release from GSM side";
			LCH->send(RELEASE);
			return;
		}
		// Check for SIP cancel, too.
		if (transaction.SIP().MTCWaitForACK()==SIP::Fail) {
			LOG(NOTICE) << "call failed on SIP side";
			LCH->send(RELEASE);
			// Cause 0x10 is "normal clearing"
			return abortCall(transaction,LCH,L3Cause(0x10));
		}
	}

	// The transaction is moving to the MTCController.
	// Once this update happens, don't change the transaction object again in this function.
	gTransactionTable.update(transaction);
	LOG(DEBUG) << "transaction: " << transaction;
	if (veryEarly) {
		// For very early assignment, we need a mode change.
		static const L3ChannelMode mode(L3ChannelMode::SpeechV1);
		LCH->send(L3ChannelModeModify(LCH->channelDescription(),mode));
		L3Message* msg_ack = getMessage(LCH);
		const L3ChannelModeModifyAcknowledge *ack =
			dynamic_cast<L3ChannelModeModifyAcknowledge*>(msg_ack);
		if (!ack) {
			if (msg_ack) {
				LOG(WARN) << "Unexpected message " << *msg_ack;
				delete msg_ack;
			}
			throw UnexpectedMessage(transaction.ID());
		}
		// Cause 0x06 is "channel unacceptable"
		bool modeOK = (ack->mode()==mode);
		delete msg_ack;
		if (!modeOK) return abortCall(transaction,LCH,L3Cause(0x06));
		MTCController(transaction,dynamic_cast<TCHFACCHLogicalChannel*>(LCH));
	}
	else {
		// For late assignment, send the TCH assignment now.
		// This dispatcher on the next channel will continue the transaction.
		assignTCHF(transaction,dynamic_cast<SDCCHLogicalChannel*>(LCH),TCH);
	}
}

/**
	Process a message received from the phone during a call.
	This function processes all deviations from the "call connected" state.
	For now, we handle call clearing and politely reject everything else.
	@param transaction The transaction record for this call.
	@param LCH The logical channel for the transaction.
	@param message A pointer to the receiver message.
	@return true If the call has been cleared and the channel released.
*/
bool callManagementDispatchGSM(TransactionEntry& transaction, LogicalChannel* LCH, const L3Message *message)
{
	LOG(DEBUG) << "from " << transaction.subscriber() << " message " << *message;

	// FIXME -- This dispatch section should be something more efficient with PD and MTI swtiches.

	// Actually check state before taking action.
	//if (transaction.SIP().state()==SIP::Cleared) return true;
	//if (transaction.Q931State()==TransactionEntry::NullState) return true;

	// Call connection steps.

	// Connect Acknowledge
	if (dynamic_cast<const L3ConnectAcknowledge*>(message)) {
		LOG(INFO) << "GSM Connect Acknowledge " << transaction.subscriber();
		transaction.resetTimers();
		transaction.Q931State(TransactionEntry::Active);
		gTransactionTable.update(transaction);
		return false;
	}

	// Connect
	// GSM 04.08 5.2.2.5 and 5.2.2.6
	if (dynamic_cast<const L3Connect*>(message)) {
		LOG(INFO) << "GSM Connect " << transaction.subscriber();
		transaction.resetTimers();
		transaction.Q931State(TransactionEntry::Active);
		gTransactionTable.update(transaction);
		return false;
	}

	// Call Confirmed
	// GSM 04.08 5.2.2.3.2
	// "Call Confirmed" is the GSM MTC counterpart to "Call Proceeding"
	if (dynamic_cast<const L3CallConfirmed*>(message)) {
		LOG(INFO) << "GSM Call Confirmed " << transaction.subscriber();
		transaction.T303().reset();
		transaction.T310().set();
		transaction.Q931State(TransactionEntry::MTCConfirmed);
		gTransactionTable.update(transaction);
		return false;
	}

	// Alerting
	// GSM 04.08 5.2.2.3.2
	if (dynamic_cast<const L3Alerting*>(message)) {
		LOG(INFO) << "GSM Alerting " << transaction.subscriber();
		transaction.T310().reset();
		transaction.T301().set();
		transaction.Q931State(TransactionEntry::CallReceived);
		gTransactionTable.update(transaction);
		return false;
	}

	// Call clearing steps.
	// Good diagrams in GSM 04.08 7.3.4

	// FIXME -- We should be checking TI values against the transaction object.

	// Disconnect (1st step of MOD)
	// GSM 04.08 5.4.3.2
	if (dynamic_cast<const L3Disconnect*>(message)) {
		LOG(INFO) << "GSM Disconnect " << transaction.subscriber();
		transaction.resetTimers();
		LCH->send(L3Release(1-transaction.TIFlag(),transaction.TIValue()));
		transaction.T308().set();
		transaction.Q931State(TransactionEntry::ReleaseRequest);
		transaction.SIP().MODSendBYE();
		gTransactionTable.update(transaction);
		return false;
	}

	// Release (2nd step of MTD)
	if (dynamic_cast<const L3Release*>(message)) {
		LOG(INFO) << "GSM Release " << transaction.subscriber();
		transaction.resetTimers();
		LCH->send(L3ReleaseComplete(1-transaction.TIFlag(),transaction.TIValue()));
		LCH->send(L3ChannelRelease());
		transaction.Q931State(TransactionEntry::NullState);
		transaction.SIP().MTDSendOK();
		gTransactionTable.update(transaction);
		return true;
	}

	// Release Complete (3nd step of MOD)
	// GSM 04.08 5.4.3.4
	if (dynamic_cast<const L3ReleaseComplete*>(message)) {
		LOG(INFO) << "GSM Release Complete " << transaction.subscriber();
		transaction.resetTimers();
		LCH->send(L3ChannelRelease());
		transaction.Q931State(TransactionEntry::NullState);
//.........这里部分代码省略.........