--- chan_sip.bak	2012-07-16 15:50:00.000000000 -0400
+++ chan_sip.c	2012-09-24 23:01:54.965718570 -0400
@@ -767,6 +767,7 @@ static int apeerobjs = 0;     /*!< Autoc
 static int regobjs = 0;       /*!< Registry objects */
 /* }@ */
 
+static int rtregsonly = 0;    /*!< Realtime registrations only */
 static struct ast_flags global_flags[3] = {{0}};  /*!< global SIP_ flags */
 static int global_t38_maxdatagram;                /*!< global T.38 FaxMaxDatagram override */
 
@@ -4715,7 +4716,7 @@ static void update_peer(struct sip_peer 
 {
 	int rtcachefriends = ast_test_flag(&p->flags[1], SIP_PAGE2_RTCACHEFRIENDS);
 	if (sip_cfg.peer_rtupdate &&
-	    (p->is_realtime || rtcachefriends)) {
+	    (p->is_realtime || rtcachefriends || rtregsonly)) {
 		realtime_update_peer(p->name, &p->addr, p->username, p->fullcontact, p->useragent, expire, p->deprecated_username, p->lastms);
 	}
 }
@@ -30570,6 +30571,7 @@ static const struct ast_data_entry sip_d
 /*! \brief PBX load module - initialization */
 static int load_module(void)
 {
+	int res;
 	ast_verbose("SIP channel loading...\n");
 
 	/* the fact that ao2_containers can't resize automatically is a major worry! */
@@ -30686,7 +30688,7 @@ static int load_module(void)
 	/* And start the monitor for the first time */
 	restart_monitor();
 
-	ast_realtime_require_field(ast_check_realtime("sipregs") ? "sipregs" : "sippeers",
+	res = ast_realtime_require_field(ast_check_realtime("sipregs") ? "sipregs" : "sippeers",
 		"name", RQ_CHAR, 10,
 		"ipaddr", RQ_CHAR, INET6_ADDRSTRLEN - 1,
 		"port", RQ_UINTEGER2, 5,
@@ -30697,7 +30699,9 @@ static int load_module(void)
 		"useragent", RQ_CHAR, 20,
 		"lastms", RQ_INTEGER4, 11,
 		SENTINEL);
-
+	
+	/* Allow realtime registrations without realtime peers */
+	rtregsonly = !res && ast_check_realtime("sipregs") && !ast_check_realtime("sippeers");
 
 	sip_register_tests();
 	network_change_event_subscribe();