Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 112128)
+++ channels/chan_sip.c	(working copy)
@@ -2531,7 +2531,11 @@
 		var = ast_load_realtime("sippeers", "name", newpeername, "host", "dynamic", NULL);
 		if (!var && sin)
 			var = ast_load_realtime("sippeers", "name", newpeername, "host", ast_inet_ntoa(sin->sin_addr), NULL);
-		if (!var) {
+		/* checking for the existence of sin here is an optimization since below, there is a
+		 * comparison made using it. If it is non-existent, then we can skip the next realtime
+		 * and dns lookups since they will end up not being useful.
+		 */
+		if (!var && sin) {
 			var = ast_load_realtime("sippeers", "name", newpeername, NULL);
 			/*!\note
 			 * If this one loaded something, then we need to ensure that the host