---
title: What is Grandstream's Dual-Network?
description: Dual Network, Mode, Grandstream, Network Configuration, Router, Dual, Switch, LAN, WAN
---

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# What is Grandstream's Dual-Network?

1. Dual-Network ConfigurationIn this scenario, you use Route Mode on the UCM to separate your internal phone traffic from the external ISP SIP network:WAN Port: Connects directly to the ISP’s handoff (modem/ONT).
2. This port is configured with the static IP, subnet, and gateway provided by the ISP for the SIP trunk.
3. LAN Port: Connects to your internal office switch. Your IP phones will register to the UCM via this port.
4. Key Setup StepsNetwork Method: Go to System Settings \> Network Settings and set the Network Method to Route.
5. WAN Settings: Enter the static IP details provided in your 3Rivers commissioning document.Static Routes:
6. You must often add a Static Route (under Network Settings \> Static Routes) to tell the UCM to send all SIP traffic (the ISP’s SBC IP) specifically out of the WAN interface, while keeping local traffic on the LAN.
7. SIP Trunk: Create a Peer SIP Trunk under Extension/Trunk \> VoIP Trunks using the IP address of the SBC SIP server.
8. Why use the WAN port?Using the dedicated WAN port for the handoff avoids "Double NAT" issues and ensures that voice traffic is physically and logically isolated from your general internet traffic, which is critical for call quality and security

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