---
title: "Fax - Plug MasterFax ATA"
slug: "fax-plug-masterfax-ata"
tags: ["calltower", "public"]
updated: 2026-07-27T12:59:28Z
published: 2026-07-27T12:59:28Z
canonical: "learn.calltower.com/fax-plug-masterfax-ata"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://learn.calltower.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Fax - Plug MasterFax ATA

Your Masterfax ATA will arrive from CallTower preconfigured with the fax DID that you indicated was needed for the device.

The device will have several ports in the back. Plug your ethernet cable into the WAN port. Plug your fax line (phone cord) into phone port 1. Plug in the power cord to the outlet, and your Masterfax should come online and be operational for your preprogrammed fax number.

![Screen Shot 2022-08-24 at 4.42.02 PM.png](https://cdn.us.document360.io/4662144b-ab1f-4796-8b7b-e9f9c609894f/Images/Documentation/Screen_Shot_2022-08-24_at_4.42.02_PM.png?sv=2026-02-06&spr=https&st=2026-11-05T04%3A46%3A37Z&se=2026-11-05T05%3A46%3A37Z&sr=c&sp=r&sig=9G4td8fCH770sONcFsjlZ27CSLjZApp3C5DQV%2FGtI7A%3D)

Analog Telephone Adapter (ATA) is a device that allows traditional telephones to connect to a digital phone service.

Direct Inward Dialing (DID) is a telecommunication service that allows a phone number to be assigned to a specific phone line within a private branch exchange (PBX), enabling direct calls to that line without going through a receptionist.