diff -urN asterisk-1.2.20.orig/apps/app_dial.c asterisk-1.2.20/apps/app_dial.c
--- asterisk-1.2.20.orig/apps/app_dial.c	2007-06-21 04:25:54.000000000 +0900
+++ asterisk-1.2.20/apps/app_dial.c	2007-07-03 15:09:46.556793536 +0900
@@ -1682,7 +1682,7 @@
 
 static int retrydial_exec(struct ast_channel *chan, void *data)
 {
-	char *announce = NULL, *context = NULL, *dialdata = NULL;
+	char *announce = NULL, *context = NULL, *dialdata = NULL, *endptr = NULL;
 	int sleep = 0, loops = 0, res = 0;
 	struct localuser *u;
 	struct ast_flags peerflags;
@@ -1716,7 +1716,8 @@
 		if ((dialdata = strchr(dialdata, '|'))) {
 			*dialdata = '\0';
 			dialdata++;
-			if (!(loops = atoi(dialdata))) {
+			loops = strtol(dialdata, &endptr, 10);
+			if (errno == EINVAL || errno == ERANGE || dialdata == endptr) {
 				ast_log(LOG_ERROR, "%s requires the numerical argument <loops>\n",rapp);
 				LOCAL_USER_REMOVE(u);
 				return -1;