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);
}
}
void Control::EmergencyCall(const L3CMServiceRequest* req, LogicalChannel *LCH)
{
assert(req);
LOG(ALARM) << "starting emergency call from request " << *req;
assert(LCH);
TCHFACCHLogicalChannel* TCH = dynamic_cast<TCHFACCHLogicalChannel*>(LCH);
assert(TCH);
// If we got a TMSI, find the IMSI.
L3MobileIdentity mobileIdentity = req->mobileIdentity();
if (mobileIdentity.type()==TMSIType) {
const char *IMSI = gTMSITable.IMSI(mobileIdentity.TMSI());
if (IMSI) mobileIdentity = L3MobileIdentity(IMSI);
}
// Can't find the TMSI? Ask for an IMSI.
if (mobileIdentity.type()==TMSIType) {
LOG(NOTICE) << "E-MOC with no IMSI or IMEI. Reqesting IMSI.";
TCH->send(L3IdentityRequest(IMSIType));
// FIXME -- This request times out on T3260, 12 sec. See GSM 04.08 Table 11.2.
L3Message* msg_resp = getMessage(TCH);
L3IdentityResponse *resp = dynamic_cast<L3IdentityResponse*>(msg_resp);
if (!resp) {
if (msg_resp) {
LOG(WARN) << "Unexpected message " << *msg_resp;
delete msg_resp;
}
throw UnexpectedMessage();
}
mobileIdentity = resp->mobileID();
delete msg_resp;
}
// Still no valid ID?? Get the IMEI.
if (mobileIdentity.type()==TMSIType) {
LOG(NOTICE) << "E-MOC with no IMSI or IMEI. Reqesting IMEI.";
TCH->send(L3IdentityRequest(IMSIType));
// FIXME -- This request times out on T3260, 12 sec. See GSM 04.08 Table 11.2.
L3Message* msg_resp = getMessage(TCH);
L3IdentityResponse *resp = dynamic_cast<L3IdentityResponse*>(msg_resp);
if (!resp) {
if (msg_resp) {
LOG(WARN) << "Unexpected message " << *msg_resp;
delete msg_resp;
}
throw UnexpectedMessage();
}
mobileIdentity = resp->mobileID();
delete msg_resp;
}
// Still no valid ID??? F*, just make something up!
if (mobileIdentity.type()==TMSIType) {
LOG(WARN) << "E-MOC with no identity, forcing to null IMSI.";
mobileIdentity = L3MobileIdentity("000000000000000");
}
// Let the phone know we're going ahead with the transaction.
LOG(NOTICE) << "sending CMServiceAccept";
TCH->send(L3CMServiceAccept());
// Get the Setup message.
L3Message* msg_setup = getMessage(TCH);
const L3EmergencySetup *setup = dynamic_cast<const L3EmergencySetup*>(msg_setup);
if (!setup) {
if (msg_setup) {
LOG(WARN) << "Unexpected message " << *msg_setup;
delete msg_setup;
}
throw UnexpectedMessage();
}
LOG(NOTICE) << *setup;
// Pull out the L3 short transaction information now.
// See GSM 04.07 11.2.3.1.3.
unsigned L3TI = setup->TIValue();
// Make a copy. Don't forget to delete it later.
char *bcd_digits = strdup(gConfig.getStr("PBX.Emergency"));
LOG(DEBUG) << "SIP start engine";
// Create a transaction table entry so the TCH controller knows what to do later.
// The transaction on the TCH is a continuation of this one and uses the same ID
TransactionEntry transaction(mobileIdentity,
req->serviceType(),
L3TI, L3CalledPartyBCDNumber(bcd_digits));
assert(transaction.TIFlag()==0);
if (mobileIdentity.type()!=TMSIType) transaction.SIP().User(mobileIdentity.digits());
transaction.Q931State(TransactionEntry::MOCInitiated);
TCH->transactionID(transaction.ID());
LOG(DEBUG) << "transaction: " << transaction;
gTransactionTable.add(transaction);
// Done with the setup message.
delete msg_setup;
// Now start a call by contacting asterisk.
// Engine methods will return their current state.
// The remote party will start ringing soon.
LOG(NOTICE) << "starting SIP (INVITE) Calling "<<bcd_digits;
unsigned basePort = allocateRTPPorts();
SIPState state = transaction.SIP().MOCSendINVITE(bcd_digits,gConfig.getStr("SIP.IP"),basePort,SIP::RTPGSM610);
LOG(DEBUG) << "SIP state="<<state;
LOG(DEBUG) << "Q.931 state=" << transaction.Q931State();
free(bcd_digits);
// For very early assignment, we need a mode change.
static const L3ChannelMode mode(L3ChannelMode::SpeechV1);
TCH->send(L3ChannelModeModify(TCH->channelDescription(),mode));
L3Message *msg_ack = getMessage(TCH);
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,TCH,L3Cause(0x06));
// From here on, it's normal call setup.
MOCController(transaction,TCH);
}
/**
This function starts MOC on the SDCCH to the point of TCH assignment.
@param req The CM Service Request that started all of this.
@param LCH The logical used to initiate call setup.
*/
void Control::MOCStarter(const L3CMServiceRequest* req, LogicalChannel *LCH)
{
assert(LCH);
assert(req);
LOG(INFO) << *req;
// Determine if very early assignment already happened.
bool veryEarly = (LCH->type()==FACCHType);
// If we got a TMSI, find the IMSI.
// Note that this is a copy, not a reference.
L3MobileIdentity mobileIdentity = req->mobileIdentity();
resolveIMSI(mobileIdentity,LCH);
// FIXME -- At this point, verify the that subscriber has access to this service.
// If the subscriber isn't authorized, send a CM Service Reject with
// cause code, 0x41, "requested service option not subscribed",
// followed by a Channel Release with cause code 0x6f, "unspecified".
// Otherwise, proceed to the next section of code.
// For now, we are assuming that the phone won't make a call if it didn't
// get registered.
// Allocate a TCH for the call, if we don't have it already.
TCHFACCHLogicalChannel *TCH = NULL;
if (!veryEarly) {
TCH = allocateTCH(dynamic_cast<SDCCHLogicalChannel*>(LCH));
// It's OK to just return on failure; allocateTCH cleaned up already,
// and the SIP side and transaction record don't exist yet.
if (TCH==NULL) return;
}
// Let the phone know we're going ahead with the transaction.
LOG(DEBUG) << "sending CMServiceAccept";
LCH->send(L3CMServiceAccept());
// Get the Setup message.
// GSM 04.08 5.2.1.2
const L3Setup *setup = NULL;
L3Message* msg_setup = NULL;
while (msg_setup = getMessage(LCH)) {
setup = dynamic_cast<const L3Setup*>(msg_setup);
if (!setup) {
L3GPRSSuspensionRequest *r = dynamic_cast<L3GPRSSuspensionRequest*>(msg_setup);
if (!r) {
if (msg_setup) {
LOG(WARN) << "Unexpected message " << *msg_setup;
delete msg_setup;
}
throw UnexpectedMessage();
} else {
LOG(INFO) << "Ignored L3 RR GPRS Suspension Request.";
if (msg_setup) delete msg_setup;
continue;
}
}
break;
}
LOG(INFO) << *setup;
// Pull out the L3 short transaction information now.
// See GSM 04.07 11.2.3.1.3.
unsigned L3TI = setup->TIValue();
if (!setup->haveCalledPartyBCDNumber()) {
// FIXME -- This is quick-and-dirty, not following GSM 04.08 5.
LOG(WARN) << "MOC setup with no number";
// Cause 0x60 "Invalid mandatory information"
LCH->send(L3ReleaseComplete(1,L3TI,L3Cause(0x60)));
LCH->send(L3ChannelRelease());
// The SIP side and transaction record don't exist yet.
// So we're done.
delete msg_setup;
return;
}
LOG(DEBUG) << "SIP start engine";
// Get the users sip_uri by pulling out the IMSI.
const char *IMSI = mobileIdentity.digits();
// Pull out Number user is trying to call and use as the sip_uri.
const char *bcd_digits = setup->calledPartyBCDNumber().digits();
// Create a transaction table entry so the TCH controller knows what to do later.
// The transaction on the TCH is a continuation of this one and uses the same ID.
TransactionEntry transaction(mobileIdentity,
req->serviceType(),
L3TI,
setup->calledPartyBCDNumber());
assert(transaction.TIFlag()==0);
transaction.SIP().User(IMSI);
transaction.Q931State(TransactionEntry::MOCInitiated);
LCH->transactionID(transaction.ID());
if (!veryEarly) TCH->transactionID(transaction.ID());
LOG(DEBUG) << "transaction: " << transaction;
gTransactionTable.add(transaction);
// At this point, we have enough information start the SIP call setup.
// We also have a SIP side and a transaction that will need to be
// cleaned up on abort or clearing.
// Now start a call by contacting asterisk.
// Engine methods will return their current state.
// The remote party will start ringing soon.
LOG(DEBUG) << "starting SIP (INVITE) Calling "<<bcd_digits;
unsigned basePort = allocateRTPPorts();
SIPState state = transaction.SIP().MOCSendINVITE(bcd_digits,gConfig.getStr("SIP.IP"),basePort,SIP::RTPGSM610);
LOG(DEBUG) << "SIP state="<<state;
LOG(DEBUG) << "Q.931 state=" << transaction.Q931State();
// Once we can start SIP call setup, send Call Proceeding.
LOG(DEBUG) << "Sending Call Proceeding";
LCH->send(L3CallProceeding(1,L3TI));
transaction.Q931State(TransactionEntry::MOCProceeding);
gTransactionTable.update(transaction);
// Finally done with the Setup message.
delete msg_setup;
// The transaction is moving on to the MOCController.
// If we need a TCH assignment, we do it here.
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_setup;
}
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));
MOCController(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);
}
}