Setting up faxing (AudioCodes MP1XX series)

This article lists the parameters needed to set up fax support on an AudioCodes MP1XX series ATA (for example, MP124 and MP112).


This article covers:

Prerequisites for setting up fax support for an AudioCodes MP1XX series gateway

Note: This article does not cover setup and provisioning of the MP1XX series ATA. This article assumes analog ports are configured and calls to and from the ports are working. Fax parameters can be assigned to an analog port that is currently configured. See the AudioCodes website for more information on the MP1XX series gateways.

Limitation of fax over Voice Internet Protocol (VOIP)

Faxing has known limitations when implemented as a fax over VoIP service. These limitations are technology-based and industry-wide. Zoom and several VoIP companies use the G.711 standard for sending faxes over the Internet. Although that standard is considered reliable, it is still open to interpretation by various providers and cannot be maintained on an end-to-end basis.

Zoom offers a fax over VoIP service that connects a traditional fax machine to the Internet via an analog terminal adapter (ATA). For occasional faxing, many of our business customers find these best-effort fax services to be cost-effective and more than adequate to serve their needs. We encourage you to assess your faxing needs to select the best option for your business.

Zoom cares about providing you with quality services that meet your business needs. If your business is heavily dependent on regularly faxing large, multi-page documents, then we recommend that you maintain an analog line and a traditional fax machine for reliable and consistent performance.

How to set up faxing on an AudioCodes MP1XX series gateway

  1. Sign in to MP1XX ATA web interface.
  2. Navigate to Configuration > VoIP > Media > Fax/Modem/CID Settings.
  3. Change the following fields to Events Only:
    • Fax Transport Mode
    • V.21 Modem Transport Type
    • V.22 Modem Transport Type
    • V.23 Modem Transport Type
    • V.32 Modem Transport Type
    • V.34 Modem Transport Type
  4. Confirm that Fax/Modem Bypass Coder Type is set to G711Ulaw or G711Alaw, depending on region.
  5. Click Submit for the parameters to take effect to the device.
  6. Click Burn to make settings persistent.