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


    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 password is admin
    Note that no symbols may appear when typing in the password, but continue anyway.
  4. Type in

    ip nat service sip sw off

    and hit Enter
    If successful, it should say Nat SIP v2 switch off!

:!: NOTE The settings are temporary and the SIP ALG service will be turned back on if your router reboots for any reason.

We suggest purchasing a router more suitable for business use