diff -u -r asterisk-1.4.28-untouched/main/pbx.c asterisk-1.4.28/main/pbx.c
--- asterisk-1.4.28-untouched/main/pbx.c	2009-12-01 17:14:31.000000000 -0400
+++ asterisk-1.4.28/main/pbx.c	2010-01-07 13:15:36.000000000 -0400
@@ -5768,7 +5768,7 @@
 	 * gone immediately to the "i" extension, but will now need to wait for a
 	 * timeout.
 	 */
-	if ((exten[0] = res) && !ast_matchmore_extension(chan, args.context, exten, 1, chan->cid.cid_num)) {
+	if ((res != -1) && (exten[0] = res) && !ast_matchmore_extension(chan, args.context, exten, 1, chan->cid.cid_num)) {
 		snprintf(chan->exten, sizeof(chan->exten), "%c", res);
 		ast_copy_string(chan->context, args.context, sizeof(chan->context));
 		chan->priority = 0;