fix not handling disconnect when in RINGING state

libs/freetdm/src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_stack_hndl.c

@@ -407,6 +407,7 @@ void sngisdn_process_cnst_ind (sngisdn_event_data_t *sngisdn_event)
 					}
 					break;
 					case FTDM_CHANNEL_STATE_RING:
+					case FTDM_CHANNEL_STATE_RINGING:
 					case FTDM_CHANNEL_STATE_PROCEED:
 					case FTDM_CHANNEL_STATE_PROGRESS:
 					case FTDM_CHANNEL_STATE_PROGRESS_MEDIA:
@@ -447,6 +448,7 @@ void sngisdn_process_disc_ind (sngisdn_event_data_t *sngisdn_event)
 	ftdm_assert(!ftdm_test_flag(ftdmchan, FTDM_CHANNEL_STATE_CHANGE), "State change flag pending\n");
 	switch (ftdmchan->state) {		
 		case FTDM_CHANNEL_STATE_RING:
+		case FTDM_CHANNEL_STATE_RINGING:
 		case FTDM_CHANNEL_STATE_DIALING:
 		case FTDM_CHANNEL_STATE_PROCEED:
 		case FTDM_CHANNEL_STATE_PROGRESS:
@@ -537,6 +539,7 @@ void sngisdn_process_rel_ind (sngisdn_event_data_t *sngisdn_event)
 		case FTDM_CHANNEL_STATE_PROGRESS_MEDIA:
 		case FTDM_CHANNEL_STATE_UP:
 		case FTDM_CHANNEL_STATE_RING:
+		case FTDM_CHANNEL_STATE_RINGING:
 			/* If we previously had a glare on this channel,
 			this RELEASE could be for the previous call.  Confirm whether call_data has
 			not changed while we were waiting for ftdmchan->mutex by comparing suInstId's */
@@ -881,6 +884,7 @@ void sngisdn_process_sta_cfm (sngisdn_event_data_t *sngisdn_event)
 							break;
 						case FTDM_CHANNEL_STATE_PROCEED:
 						case FTDM_CHANNEL_STATE_PROGRESS:
+						case FTDM_CHANNEL_STATE_RINGING:
 						case FTDM_CHANNEL_STATE_PROGRESS_MEDIA:
 							ftdm_log_chan_msg(ftdmchan, FTDM_LOG_WARNING, "Remote switch expecting OVERLAP receive, but we are already PROCEEDING\n");
 							sngisdn_snd_disconnect(ftdmchan);
@@ -899,6 +903,7 @@ void sngisdn_process_sta_cfm (sngisdn_event_data_t *sngisdn_event)
 				switch (ftdmchan->state) {
 					case FTDM_CHANNEL_STATE_PROCEED:
 					case FTDM_CHANNEL_STATE_PROGRESS:
+					case FTDM_CHANNEL_STATE_RINGING:
 						/* T310 timer has expired */
 						ftdmchan->caller_data.hangup_cause = staEvnt->causeDgn[0].causeVal.val;
 						ftdm_log_chan_msg(ftdmchan, FTDM_LOG_DEBUG, "T310 Timer expired, hanging up call\n");
@@ -935,6 +940,7 @@ void sngisdn_process_sta_cfm (sngisdn_event_data_t *sngisdn_event)
 				break;
 			case 9: /* Remote switch is in "Incoming call proceeding" state */
 				switch (ftdmchan->state) {
+					case FTDM_CHANNEL_STATE_RINGING:
 					case FTDM_CHANNEL_STATE_PROGRESS:
 					case FTDM_CHANNEL_STATE_PROGRESS_MEDIA:
 					case FTDM_CHANNEL_STATE_GET_CALLERID: