diff --git a/lib/routes/api/sip-gateways.js b/lib/routes/api/sip-gateways.js
index 3c92a09..16162f3 100644
--- a/lib/routes/api/sip-gateways.js
+++ b/lib/routes/api/sip-gateways.js
@@ -4,6 +4,7 @@ const {DbErrorBadRequest, DbErrorForbidden} = require('../../utils/errors');
 //const {parseSipGatewaySid} = require('./utils');
 const decorate = require('./decorate');
 const sysError = require('../error');
+const net = require('net');
 
 const checkUserScope = async(req, voip_carrier_sid) => {
   const {lookupCarrierBySid} = req.app.locals;
@@ -41,7 +42,7 @@ const checkUserScope = async(req, voip_carrier_sid) => {
 
 const validate = async(req, sid) => {
   const {lookupSipGatewayBySid} = req.app.locals;
-  const {netmask} = req.body;
+  const {netmask, ipv4, inbound, outbound} = req.body;
   let voip_carrier_sid;
 
   if (sid) {
@@ -59,6 +60,12 @@ const validate = async(req, sid) => {
     throw new DbErrorBadRequest(
       `netmask required to have value equal or greater than ${process.env.JAMBONZ_MIN_GATEWAY_NETMASK}`);
   }
+  if (inbound && !net.isIPv4(ipv4)) {
+    throw new DbErrorBadRequest('Inbound gateway must be IPv4 address');
+  }
+  if (!inbound && outbound && (netmask && netmask != 32)) {
+    throw new DbErrorBadRequest('For outbound only gateway netmask can only be 32');
+  }
   await checkUserScope(req, voip_carrier_sid);
 };