How to Disable SIP ALG on Netgear Routers

Introduction

SIP ALG is used to try and avoid configuring Static NAT on a router. Its implementation, however, varies from one router to another, often making it difficult to inter-operate a router with SIP ALG enabled with a PBX. In general, you would want to disable SIP ALG and configure one to one port mapping on the router.

In this article, we will show you how to disable SIP ALG on a Netgear router. SIP ALG on this router is known to cause problems with VoIP calls.

Follow this step-by-step guide:

Option 1

  1. Open the Netgear router configuration by browsing to its LAN Address (http://192.168.0.1 by default).
  2. Log in to the router’s configuration. The default username is “admin” and the default password is “password”.

Netgear WAN Setup

  1. In the main menu, select “Advanced” → “WAN Setup”.
  2. Enable the option “Disable SIP ALG”.
  3. Click “Apply”.

Option 2

  1. Open the Netgear router configuration by browsing to its LAN Address (http://192.168.0.1 by default).
  2. Log in to the router’s configuration. The default username is “admin” and the default password is “password”.

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  1. In the main menu, select “Security” → “Firewall” → “Advanced”.
  2. Uncheck the option “Enable SIP ALG”.
  3. Click “Apply”.

Notes

  • The SIP phones behind this router should be configured not to use STUN.
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