freetdm: added SIGEVENT_COLLISION

libs/freetdm/src/include/freetdm.h

@@ -292,11 +292,12 @@ typedef enum {
 	FTDM_SIGEVENT_ADD_CALL, /*!< New call should be added to the channel */
 	FTDM_SIGEVENT_RESTART, /*!< Restart has been requested. Typically you hangup your call resources here */
 	FTDM_SIGEVENT_SIGSTATUS_CHANGED, /*!< Signaling protocol status changed (ie: D-chan up), see new status in raw_data ftdm_sigmsg_t member */
+	FTDM_SIGEVENT_COLLISION, /*!< Outgoing call was dropped because an incoming call arrived at the same time */
 	FTDM_SIGEVENT_INVALID
 } ftdm_signal_event_t;
 #define SIGNAL_STRINGS "START", "STOP", "UP", "FLASH", "PROGRESS", \
 		"PROGRESS_MEDIA", "TONE_DETECTED", "ALARM_TRAP", "ALARM_CLEAR", \
-		"COLLECTED_DIGIT", "ADD_CALL", "RESTART", "SIGSTATUS_CHANGED", "INVALID"
+		"COLLECTED_DIGIT", "ADD_CALL", "RESTART", "SIGSTATUS_CHANGED", "COLLISION", "INVALID"
 
 /*! \brief Move from string to ftdm_signal_event_t and viceversa */
 FTDM_STR2ENUM_P(ftdm_str2ftdm_signal_event, ftdm_signal_event2str, ftdm_signal_event_t)