diff --git a/openbsc/src/nat/bsc_mgcp_utils.c b/openbsc/src/nat/bsc_mgcp_utils.c
index d814f0d..f002926 100644
--- a/openbsc/src/nat/bsc_mgcp_utils.c
+++ b/openbsc/src/nat/bsc_mgcp_utils.c
@@ -48,6 +48,7 @@
 	if (!con->cfg)
 		return -1;
 
+	con->number_endpoints = 31 * con->cfg->number_multiplexes;
 	con->_endpoint_status = talloc_zero_array(con, char,
 						  (32 * con->cfg->number_multiplexes) + 1);
 	return con->_endpoint_status == NULL;
@@ -55,7 +56,7 @@
 
 static int bsc_assign_endpoint(struct bsc_connection *bsc, struct sccp_connections *con)
 {
-	const int number_endpoints = 31 * bsc->cfg->number_multiplexes;
+	const int number_endpoints = bsc->number_endpoints;
 	int i;
 
 	for (i = 1; i <= number_endpoints; ++i) {