skip all the hangup code in ringing state

src/mod/applications/mod_spandsp/mod_spandsp_modem.c

@@ -1053,6 +1053,7 @@ static int control_handler(modem_t *modem, const char *num, int op)
     case AT_MODEM_CONTROL_ONHOOK:
     case AT_MODEM_CONTROL_HANGUP: 
 		{
+			if (modem_get_state(modem) != MODEM_STATE_RINGING) {
 				int set_state = 1;
 				
 				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG,
@@ -1060,16 +1061,17 @@ static int control_handler(modem_t *modem, const char *num, int op)
 				switch_clear_flag(modem, MODEM_FLAG_XOFF);
 				wake_modem_thread(modem);
 				
+
 				modem_set_state(modem, MODEM_STATE_HANGUP);
 			
+
 				if (!zstr(modem->uuid_str)) {
 					switch_core_session_t *session;
 					
 					if ((session = switch_core_session_force_locate(modem->uuid_str))) {
 						switch_channel_t *channel = switch_core_session_get_channel(session);
 						
-					if (switch_channel_up(channel) && 
-						(switch_channel_test_flag(channel, CF_ANSWERED) || switch_channel_direction(channel) == SWITCH_CALL_DIRECTION_INBOUND)) {
+						if (switch_channel_up(channel)) {
 							switch_channel_hangup(channel, SWITCH_CAUSE_NORMAL_CLEARING);
 							set_state = 0;
 						}
@@ -1077,10 +1079,12 @@ static int control_handler(modem_t *modem, const char *num, int op)
 					}
 				}
 				
+
 				if (set_state) {
 					modem_set_state(modem, MODEM_STATE_ONHOOK);
 				}
 			}
+		}
         break;
     case AT_MODEM_CONTROL_DTR:
         switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG,