Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 193954)
+++ channels/chan_sip.c	(working copy)
@@ -8083,12 +8083,15 @@
 /*! \brief Remove registration data from realtime database or AST/DB when registration expires */
 static void destroy_association(struct sip_peer *peer)
 {
-	if (!ast_test_flag(&global_flags[1], SIP_PAGE2_IGNOREREGEXPIRE)) {
-		if (ast_test_flag(&peer->flags[1], SIP_PAGE2_RT_FROMCONTACT) && ast_test_flag(&global_flags[1], SIP_PAGE2_RTUPDATE)) {
-			ast_update_realtime("sippeers", "name", peer->name, "fullcontact", "", "ipaddr", "", "port", "", "regseconds", "0", "username", "", "regserver", "", NULL);
-			ast_update_realtime("sippeers", "name", peer->name, "lastms", "", NULL);
-		} else 
-			ast_db_del("SIP/Registry", peer->name);
+	/* Do not check for ignoreregexpire here or we will loop constantly and
+	 * take down the server.  Instead, check prior to calling this function
+	 * and avoid in-memory destruction of the peer.  Realtime MUST remain
+	 * consistent with in-memory structs. */
+	if (ast_test_flag(&peer->flags[1], SIP_PAGE2_RT_FROMCONTACT) && ast_test_flag(&global_flags[1], SIP_PAGE2_RTUPDATE)) {
+		ast_update_realtime("sippeers", "name", peer->name, "fullcontact", "", "ipaddr", "", "port", "", "regseconds", "0", "username", "", "regserver", "", NULL);
+		ast_update_realtime("sippeers", "name", peer->name, "lastms", "", NULL);
+	} else {
+		ast_db_del("SIP/Registry", peer->name);
 	}
 }