FS-6226Prevent DTMF from traversing bridged channels, but still allow me to send…

FS-6226Prevent DTMF from traversing bridged channels, but still allow me to send DTMF via API or dp app (uuid_send_dtmf or send_dtmf)

src/switch_ivr_bridge.c

@@ -214,7 +214,7 @@ static void *audio_bridge_thread(switch_thread_t *thread, void *obj)
 	const char *silence_var;
 	int silence_val = 0, bypass_media_after_bridge = 0;
 	const char *bridge_answer_timeout = NULL;
-	int answer_timeout, sent_update = 0;
+	int bridge_filter_dtmf, answer_timeout, sent_update = 0;
 	time_t answer_limit = 0;
 	const char *exec_app = NULL;
 	const char *exec_data = NULL;
@@ -331,6 +331,8 @@ static void *audio_bridge_thread(switch_thread_t *thread, void *obj)
 		}
 	}
 
+	bridge_filter_dtmf = switch_true(switch_channel_get_variable(chan_a, "bridge_filter_dtmf"));
+
 	for (;;) {
 		switch_channel_state_t b_state;
 		switch_status_t status;
@@ -449,6 +451,11 @@ static void *audio_bridge_thread(switch_thread_t *thread, void *obj)
 					}
 				}
 
+				if (bridge_filter_dtmf) {
+					send_dtmf = 0;
+					switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session_a), SWITCH_LOG_DEBUG, "Dropping filtered DTMF received on %s\n", switch_channel_get_name(chan_a));
+				}
+
 				if (send_dtmf) {
 					switch_core_session_send_dtmf(session_b, &dtmf);
 					switch_core_session_kill_channel(session_b, SWITCH_SIG_BREAK);