diff --git a/src/gb/gprs_ns2_udp.c b/src/gb/gprs_ns2_udp.c
index 36f6a97..3081680 100644
--- a/src/gb/gprs_ns2_udp.c
+++ b/src/gb/gprs_ns2_udp.c
@@ -402,6 +402,10 @@
 		return NULL;
 	}
 
+	/* duplicate */
+	if (gprs_ns2_nsvc_by_sockaddr_bind(bind, remote))
+		return NULL;
+
 	sockaddr_str = (char *)osmo_sockaddr_to_str(remote);
 	osmo_identifier_sanitize_buf(sockaddr_str, NULL, '_');
 	snprintf(idbuf, sizeof(idbuf), "%s-NSE%05u-remote-%s", gprs_ns2_lltype_str(nse->ll),
diff --git a/src/gb/gprs_ns2_vty.c b/src/gb/gprs_ns2_vty.c
index 4bd7cde..6214907 100644
--- a/src/gb/gprs_ns2_vty.c
+++ b/src/gb/gprs_ns2_vty.c
@@ -1093,6 +1093,15 @@
 		goto err;
 	}
 
+	nsvc = gprs_ns2_nsvc_by_sockaddr_bind(bind, &remote);
+	if (nsvc) {
+		if (nsvc->nse == nse)
+			vty_out(vty, "Specified NSVC is already present in this NSE.%s", VTY_NEWLINE);
+		else
+			vty_out(vty, "Specified NSVC is already present in another NSE%05u.%s", nsvc->nse->nsei, VTY_NEWLINE);
+		goto err;
+	}
+
 	nsvc = gprs_ns2_ip_connect(bind, &remote, nse, 0);
 	if (!nsvc) {
 		vty_out(vty, "Can not create NS-VC.%s", VTY_NEWLINE);