FS-3358 please test and close if it works

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -929,6 +929,8 @@ static switch_status_t sofia_read_frame(switch_core_session_t *session, switch_f
 	}
 
 	while (!(tech_pvt->read_codec.implementation && switch_rtp_ready(tech_pvt->rtp_session) && !switch_channel_test_flag(channel, CF_REQ_MEDIA))) {
+		switch_ivr_parse_all_messages(tech_pvt->session);
+
 		if (--sanity && switch_channel_up(channel)) {
 			switch_yield(10000);
 		} else {

src/switch_channel.c

@@ -1693,6 +1693,8 @@ SWITCH_DECLARE(int) switch_channel_test_ready(switch_channel_t *channel, switch_
 
 	switch_assert(channel != NULL);
 
+	switch_ivr_parse_all_messages(channel->session);
+
 	if (check_media) {
 		ret = ((switch_channel_test_flag(channel, CF_ANSWERED) ||
 				switch_channel_test_flag(channel, CF_EARLY_MEDIA)) && !switch_channel_test_flag(channel, CF_PROXY_MODE) &&

src/switch_core_session.c

@@ -809,7 +809,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_dequeue_message(switch_core_
 
 	switch_assert(session != NULL);
 
-	if (session->message_queue) {
+	if (session->message_queue && switch_queue_size(session->message_queue)) {
 		if ((status = (switch_status_t) switch_queue_trypop(session->message_queue, &pop)) == SWITCH_STATUS_SUCCESS) {
 			*message = (switch_core_session_message_t *) pop;
 			if ((*message)->delivery_time && (*message)->delivery_time > switch_epoch_time_now(NULL)) {