{{tag>Troubleshooting Broadband_Routers SIP_ALG Technicolor}}
====== How to Disable SIP ALG on the Technicolor TG589VAC and and TG588v v2 Router ======
SIP ALG (Application Layer Gateway) is a feature which is enabled by default in most Technicolor routers and inspects VoIP traffic as it passes through and modifies the messages on-the-fly.

In few situations this is useful, but in most situations SIP ALG can cause problems using the service. Very often, SIP ALG is poorly implemented causing VoIP messages to be modified in a harmful way or simply corrupts them. In such cases you may experience issues registering your handset, one-way or no audio, unable to receive calls, and issues with [[features:blf|BLF]] and Message Waiting Indicators.

For our Hosted VoIP service, including out Single User services, SIP ALG must be disabled on your Technicolor router.

This guide explains how to disable //SIP ALG// on the following models:

  * Technicolor TG589vac
  * Technicolor TG589vac v2
  * Technicolor TG588v v2

For other Technicolor router models, such as the [[technicolor|Technicolor TG582n]] and [[technicolor|Technicolor TG589vn V3]], see [[technicolor|this guide]].

====== Step-by-Step Guide  ======
  - Fire up a browser (Firefox, Chrome etc) and go to **192.168.1.1** (this is the default IP address)
  - On the top-right click **Sign in**
      * The default //username// is **admin** and the default //password// is **admin** 
  - Amend the URL so there is **?debug=1** at the end\\ so the URL should be similar to **http://192.168.1.254/?debug=1**
  - Scroll down and click on **NAT Helpers**
  - Toggle the switch for **SIP** to switch it **OFF** and click **Close**
  - Close your browser and restart your handset. SIP ALG is now disabled.

====== Other Technicolor Routers ======
Different Technicolor routers may have different instructions. Please see list below for instructions for your particular device.

{{topic>Technicolor&nodate}}


====== Further Reading ======
For further information please contact the retailer you purchased the Technicolor TG589vac router from.

If you purchased the Technicolor from SureVoIP then SIP ALG will already be disabled.