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Use the following guide to disable call waiting and the call waiting tone on Cisco SPA 112.

  1. Log in to the phone adapter configuration utility by navigating to the device's IP address. Use the username "admin" and password "8675309" at the login screen.
  2. Navigate to Voice and then to the user you want to change, either User 1 or User 2. The users correspond with line 1 and line 2 on the device. 
  3. Scroll down to the "Supplementary Service Settings" area.

  4. Set the CW setting to NO using the dropdown box.
  5. Click Submit to save your changes. The device will reboot.