diff --git a/apps/app_dial.c b/apps/app_dial.c
index a1522a81a..581a88170 100644
--- a/apps/app_dial.c
+++ b/apps/app_dial.c
@@ -1944,7 +1944,7 @@ static int dial_exec_full(struct ast_channel *chan, const char *data, struct ast
 		struct ast_dialed_interface *di;
 		AST_LIST_HEAD(, ast_dialed_interface) *dialed_interfaces;
 		num_dialed++;
-		if (!number) {
+		if (ast_strlen_zero(number)) {
 			ast_log(LOG_WARNING, "Dial argument takes format (technology/[device:]number1)\n");
 			goto out;
 		}
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index d0c0fffa3..a33a0ddd1 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -25347,6 +25347,12 @@ static struct ast_channel *sip_request_call(const char *type, format_t format, c
 	}
 	ast_debug(1, "Asked to create a SIP channel with formats: %s\n", ast_getformatname_multiple(tmp, sizeof(tmp), oldformat));
 
+	if (ast_strlen_zero(dest)) {
+		ast_log(LOG_ERROR, "Unable to create channel with empty destination.\n");
+		*cause = AST_CAUSE_CHANNEL_UNACCEPTABLE;
+		return NULL;
+	}
+
 	if (!(p = sip_alloc(NULL, NULL, 0, SIP_INVITE, NULL))) {
 		ast_log(LOG_ERROR, "Unable to build sip pvt data for '%s' (Out of memory or socket error)\n", dest);
 		*cause = AST_CAUSE_SWITCH_CONGESTION;