Disable SIP ALG on a Technicolor TG582n – 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 Busy Lamp Field (BLF) and Message Waiting Indicators (MWI).

  1. Press the Windows Start button and in the search box type in cmd and hit Enter
  2. Type in

    telnet 192.168.1.254

    and hit Enter
    Note Windows Vista/7 may not have Telnet installed by default. Please click on Start → Control Panel → Programs → Programs and Features → Turn Windows Features on or off → Ensure TELNET CLIENT is checked and click OK.

  3. When prompted, the default username is Administrator and the default password is the serial number
    Note that no symbols may appear when typing in the password, but continue anyway.
    Also note that the username and password is case-sensitive.
  4. Type in

    connection unbind application=SIP port=5060

    and hit Enter

    Disable SIP ALG on a Technicolor TG582n

  5. Type in

    saveall

    and hit Enter to apply and make this setting permanent.

  6. Type in

    exit

    and hit Enter to exit.

     

Now turning this off doesn’t mean it will work. I would always try the VoIP phone on another router to be sure your configuration is correct. You should also contact your SIP provider to ensure you are using a recommend/supported router. I would never try and use a home router with VoIP as the functionality isn’t available on most due to them being basic. That being said, it should still work.

You can also take a look at my UBNT Amplifi HD Router Review.

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