How to Disable SIP ALG on Netgear Routers

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:

  1. Open the Netgear router’s configuration by browsing to its LAN Address ( by default).
  2. Log on to the router’s configuration. The default username is ‘admin’ and the default password is ‘password’
    Netgear WAN Setup
  3. In the main menu, select Advanced and then WAN Setup
  4. Enable the option Disable SIP ALG
  5. Click Apply to apply this setting.


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

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