freetdm: ignore fax events for now

libs/freetdm/src/ftmod/ftmod_wanpipe/ftmod_wanpipe.c

@@ -1166,6 +1166,11 @@ FIO_SPAN_NEXT_EVENT_FUNCTION(wanpipe_next_event)
 					char tmp_dtmf[2] = { tdm_api.wp_tdm_cmd.event.wp_tdm_api_event_dtmf_digit, 0 };
 					event_id = FTDM_OOB_NOOP;
 
+					if (tmp_dtmf[0] == 'f') {
+						ftdm_log_chan(ftdmchan, FTDM_LOG_DEBUG, "Ignoring wanpipe DTMF: %c, fax tones will be passed through!\n", tmp_dtmf[0]);
+						break;
+					}
+
 					if (tdm_api.wp_tdm_cmd.event.wp_tdm_api_event_dtmf_type == WAN_EC_TONE_PRESENT) {
 						ftdm_set_flag_locked(ftdmchan, FTDM_CHANNEL_MUTE);
 					}