FS-4729 try this patch clean

src/include/switch_types.h

@@ -1249,6 +1249,7 @@ typedef enum {
 	CF_TRACKABLE,
 	CF_NO_CDR,
 	CF_EARLY_OK,
+	CF_MEDIA_TRANS,
 	/* WARNING: DO NOT ADD ANY FLAGS BELOW THIS LINE */
 	/* IF YOU ADD NEW ONES CHECK IF THEY SHOULD PERSIST OR ZERO THEM IN switch_core_session.c switch_core_session_request_xml() */
 	CF_FLAG_MAX

src/switch_ivr.c

@@ -1476,6 +1476,13 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_media(const char *uuid, switch_media_
 
 	if ((session = switch_core_session_locate(uuid))) {
 		channel = switch_core_session_get_channel(session);
+		
+		if (switch_channel_test_flag(channel, CF_MEDIA_TRANS)) {
+			switch_core_session_rwunlock(session);
+			return SWITCH_STATUS_INUSE;
+		}
+
+		switch_channel_set_flag(channel, CF_MEDIA_TRANS);
 
 		if ((flags & SMF_REBRIDGE) && !switch_channel_test_flag(channel, CF_BRIDGE_ORIGINATOR)) {
 			swap = 1;
@@ -1527,6 +1534,7 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_media(const char *uuid, switch_media_
 			}
 		}
 
+		switch_channel_clear_flag(channel, CF_MEDIA_TRANS);
 		switch_core_session_rwunlock(session);
 
 		if (other_channel) {
@@ -1559,6 +1567,13 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_nomedia(const char *uuid, switch_medi
 		status = SWITCH_STATUS_SUCCESS;
 		channel = switch_core_session_get_channel(session);
 
+		if (switch_channel_test_flag(channel, CF_MEDIA_TRANS)) {
+			switch_core_session_rwunlock(session);
+			return SWITCH_STATUS_INUSE;
+		}
+
+		switch_channel_set_flag(channel, CF_MEDIA_TRANS);
+
 		if ((flags & SMF_REBRIDGE) && !switch_channel_test_flag(channel, CF_BRIDGE_ORIGINATOR)) {
 			swap = 1;
 		}
@@ -1617,9 +1632,12 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_nomedia(const char *uuid, switch_medi
 				switch_core_session_rwunlock(other_session);
 			}
 		}
-		switch_core_session_rwunlock(session);
+
+		switch_channel_clear_flag(channel, CF_MEDIA_TRANS);
 	}
 
+
+
 	return status;
 }