diff --git a/lib/call-session.js b/lib/call-session.js
index 4b41305..8310482 100644
--- a/lib/call-session.js
+++ b/lib/call-session.js
@@ -273,12 +273,20 @@ class CallSession extends Emitter {
       }
 
       if (this.req.canceled) throw new Error('call canceled');
+      const {gateway} = this.req.locals;
 
       // now send the INVITE in towards the feature servers
       debug(`sending INVITE to ${proxy} with ${uri}`);
       const {uas, uac} = await this.srf.createB2BUA(this.req, this.res, uri, {
         proxy,
         headers,
+        // passing gateway outbound auth that sbc-inbound can send RE-INVITE with authentication process on UAS side
+        ...(gateway.register_username && gateway.register_password && {
+          auth: {
+            username: gateway.register_username,
+            password: gateway.register_password
+          }
+        }),
         responseHeaders,
         proxyRequestHeaders: [
           'all',
diff --git a/lib/db-utils.js b/lib/db-utils.js
index 5f2d415..03986dd 100644
--- a/lib/db-utils.js
+++ b/lib/db-utils.js
@@ -7,7 +7,8 @@ const sqlSelectSPForAccount = 'SELECT service_provider_sid FROM accounts WHERE a
 
 const sqlSelectAllCarriersForAccountByRealm =
 `SELECT sg.sip_gateway_sid, sg.voip_carrier_sid, vc.name, vc.account_sid,  
-vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto
+vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto,
+vc.register_username, vc.register_password
 FROM sip_gateways sg, voip_carriers vc, accounts acc 
 WHERE acc.sip_realm = ? 
 AND vc.account_sid = acc.account_sid 
@@ -17,7 +18,8 @@ AND sg.voip_carrier_sid = vc.voip_carrier_sid`;
 
 const sqlSelectAllCarriersForSPByRealm =
 `SELECT sg.sip_gateway_sid, sg.voip_carrier_sid, vc.name, vc.account_sid,  
-vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto
+vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto,
+vc.register_username, vc.register_password
 FROM sip_gateways sg, voip_carriers vc, accounts acc 
 WHERE acc.sip_realm = ? 
 AND vc.service_provider_sid = acc.service_provider_sid  
@@ -28,7 +30,8 @@ AND sg.voip_carrier_sid = vc.voip_carrier_sid`;
 
 const sqlSelectAllGatewaysForSP =
 `SELECT sg.sip_gateway_sid, sg.voip_carrier_sid, vc.name, vc.service_provider_sid,  
-vc.account_sid, vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto
+vc.account_sid, vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto,
+vc.register_username, vc.register_password
 FROM sip_gateways sg, voip_carriers vc
 WHERE sg.voip_carrier_sid = vc.voip_carrier_sid 
 AND vc.service_provider_sid IS NOT NULL 
@@ -57,7 +60,8 @@ AND outbound = 1`;
 
 const sqlSelectCarrierRequiringRegistration = `
 SELECT sg.sip_gateway_sid, sg.voip_carrier_sid, vc.name, vc.service_provider_sid, vc.account_sid,
-vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto
+vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto,
+vc.register_username, vc.register_password
 FROM sip_gateways sg, voip_carriers vc
 WHERE sg.voip_carrier_sid = vc.voip_carrier_sid
 AND vc.requires_register = 1
@@ -77,7 +81,8 @@ AND (
 
 const sqlSelectGatewaysByVoipCarrierSids = `
 SELECT sg.sip_gateway_sid, sg.voip_carrier_sid, vc.name, vc.service_provider_sid,
-vc.account_sid, vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto
+vc.account_sid, vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto,
+vc.register_username, vc.register_password
 FROM sip_gateways sg, voip_carriers vc
 WHERE sg.voip_carrier_sid IN (?)
 AND sg.voip_carrier_sid = vc.voip_carrier_sid