/**
* Watches EDSS1 messages for calls. Keeps an internal call state
* and notifies loggers of incoming and finished calls.
+ *
+ * Notifications:
+ * - startingCall
+ * - finishedCall
*/
class CallMonitor
{
+ protected $currentCalls = array();
+
public function __construct($config, $log)
{
$this->config = $config;
public function handle(EDSS1_Message $msg)
{
+ $callId = $msg->callRef;
+ if (!array_key_exists($callId, $this->currentCalls)) {
+ $this->handleNew($callId, $msg);
+ } else {
+ $this->handleExisting($callId, $msg);
+ }
+ }
+
+ protected function handleNew($callId, EDSS1_Message $msg)
+ {
+ if ($msg->type != EDSS1_Message::SETUP) {
+ return;
+ }
+ $this->currentCalls[$callId] = new CallMonitor_Call();
+ $this->handleSetup($callId, $msg);
}
+
+ protected function handleSetup($callId, EDSS1_Message $msg)
+ {
+ $call = $this->currentCalls[$callId];
+ $call->start = time();
+ if ($msg->tei == 127) {
+ $call->type = CallMonitor_Call::INCOMING;
+ } else {
+ $call->type = CallMonitor_Call::OUTGOING;
+ }
+
+ $this->handleParams($msg, $call, $callId);
+ }
+
+
+ protected function handleExisting($callId, EDSS1_Message $msg)
+ {
+ $call = $this->currentCalls[$callId];
+
+ switch ($msg->type) {
+ case EDSS1_Message::INFORMATION:
+ $this->handleParams($msg, $call, $callId);
+ break;
+ case EDSS1_Message::ALERTING:
+ if ($call->type == CallMonitor_Call::OUTGOING) {
+ /**
+ * There may be two alerts: One from the telephone to the
+ * switchboard, and one from the switchboard to the target.
+ *
+ * The alert from the switchboard to the target call is
+ * sent first, so we can remove the call from the telephone
+ * to the switchboard.
+ */
+ $bFound = false;
+ foreach ($this->currentCalls as $otherCallId => $otherCall) {
+ if ($otherCallId != $callId && $otherCall->to == $call->to) {
+ $bFound = true;
+ break;
+ }
+ }
+ if ($bFound) {
+ unset($this->currentCalls[$otherCallId]);
+ }
+ }
+ $this->log->log('startingCall', array('call' => $call));
+ break;
+
+ case EDSS1_Message::RELEASE:
+ case EDSS1_Message::RELEASE_COMPLETE:
+ $call->end = time();
+ $this->log->log('finishedCall', array('call' => $call));
+ unset($this->currentCalls[$callId]);
+ break;
+ }
+ }
+
+ protected function handleParams($msg, $call, $callId)
+ {
+ foreach ($msg->parameters as $param) {
+ switch ($param->type) {
+ case EDSS1_Parameter::CALLING_PARTY_NUMBER:
+ $call->from = $this->getFullNumber(
+ $param->number, $param->numberType
+ );
+ break;
+ case EDSS1_Parameter::CALLED_PARTY_NUMBER:
+ $call->to = $this->getFullNumber(
+ $param->number, $param->numberType
+ );
+ if ($call->type == CallMonitor_Call::INCOMING
+ && $param->numberType != EDSS1_Parameter_Names::NUMBER_SUBSCRIBER
+ ) {
+ //only keep incoming calls that arrive at the switchboard,
+ // not the ones from the switchboard to the telephones
+ unset($this->currentCalls[$callId]);
+ }
+ break;
+ case EDSS1_Parameter::KEYPAD:
+ if ($call->to === null) {
+ $call->to = $param->data;
+ }
+ }
+ }
+ }
+
+
+ protected function getFullNumber($number, $type)
+ {
+ if ($type == EDSS1_Parameter_Names::NUMBER_NATIONAL) {
+ return '0' . $number;
+ }
+ return $number;
+ }
}
?>