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Avaya IP Office

The Avaya IP Office platform is the ultimate in converged voice and data technology. IP Office brings a combination of voice and data applications formerly reserved for only the largest corporations. Cutting edge customer service with easy to use tools is now available to the smallest of businesses.

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Global IP Office Technical Tip
117: IP Office to ACM Fax over IP Interoperation
*Release Date: 20 Jan 2006



The trialling of Fax-over-IP (FoIP) interoperation between IP Office and the Avaya Communication Manager (ACM) commenced with the release of IP Office V2.1 core software (refer to the 2.1 Release TB). During the trial stages changes were made to the way in which the ACM platform supported FoIP. As a result this functionality was never formally released.

Since the introduction of ACM release 2.1.1, the implementation of FoIP on the ACM has evolved from a proprietary implementation to the industry standard T.38 model. More recently, with the introduction of ACM release 3.0 it has evolved further, with the ACM
supporting additional features on top of T.38 support (please refer to latest ACM documentation for further information).

Due to these on-going changes in the method of operation of the ACM, FoIP interoperability between IP Office and ACM can only be guaranteed between IP Office V2.1 and ACM 2.1.

Fax over voice over IP will continue to be supported between IP Office and ACM, as will FoIP between multiple IP Office systems.

For T.38 support between IP Office 3.0 and higher releases and ACM, 3rd party T.38 gateways should be used in order to ensure compatibility.

Fax Relay Mode is not supported by IP Office. It should also be remembered that the Fax over IP that is used by the IP Office is a proprietary version of the T.38 standard and not compatible with all of the T.38 Features.

FoIP configuration between IP Office and ACM 2.1

IP Office End

The IP Office IP Trunk to the Definity should be configured as follows:-


Please note that the "Fax Transport Support" option MUST be turned off and the Compression mode MUST be set to either G.711 ALaw or G.711 ULaw (the Definity IP Trunk should be set for the same Codec set).

An entry must be correctly configured for the "Gateway IP Address".

Definity Hardware and Software Configuration

Hardware requirements

The following components are required:

CM 2.1 or Greater
Medpro TN2302AP HW11 or greater with FW95
CLAN TN799DP with FW12

This will not work with a Medpro TN2302AP HW3.

In our tests we used an IP Connect S8700 Running CM2.1 - 411.7

Software Configuration
Add a Node Name for the IP Office:


Now add the signalling group:

Then add the trunk group as follows:


Once the trunk is up, the codec set that is being used by the Medpro resource needs to be changed. In the example below everything is using network region 1.

As network region 1 is being used, the codec set being used needs to be checked:


In this example codec set 1 is being used. Next, check that the G.711 codec is also being used:


On the next page FAX support and Modem support needs to be turned off. If this is not done then the Medpro TN2302AP will detect fax tones and then request that the fax is sent in Relay mode. This is not supported by IP Office.


It should now be possible to send a test fax between your Definity and IP Office.


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