Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 113116)
+++ channels/chan_sip.c	(working copy)
@@ -12895,6 +12895,7 @@
 						break;
 					}
 					/* Fall through */
+				case 502: /* Bad gateway */
 				case 503: /* Service Unavailable */
 				case 504: /* Server Timeout */
 					if (owner)