FS-6513 --resolve This function was assuming the app was being run with…

FS-6513 --resolve This function was assuming the app was being run with execute_on_media so it did not properly check for established media.  Now it will use the scheduler method automatically when this state is detected.

src/switch_core_session.c

@@ -1547,11 +1547,11 @@ SWITCH_DECLARE(void) switch_core_session_enable_heartbeat(switch_core_session_t
 
 	session->track_duration = seconds;
 
-	if (switch_channel_test_flag(session->channel, CF_PROXY_MODE) || 
+	if (switch_channel_test_flag(session->channel, CF_PROXY_MODE) || !switch_channel_media_ready(session->channel) ||
 		switch_true(switch_channel_get_variable_dup(session->channel, "heartbeat_use_scheduler", SWITCH_FALSE, -1)) ||
 		switch_true(switch_channel_get_variable_dup(session->channel, "bypass_media", SWITCH_FALSE, -1)) ||
 		switch_true(switch_channel_get_variable_dup(session->channel, "bypass_media_after_bridge", SWITCH_FALSE, -1))) {
-		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_WARNING, "%s using scheduler due to bypass_media mode\n",
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_WARNING, "%s using scheduler due to bypass media or media is not established.\n",
 						  switch_channel_get_name(session->channel));
 		switch_core_session_sched_heartbeat(session, seconds);
 		return;