Enable G.729 signaling for Digital Fax

Applies to:

All UCX Suite versions.

Description:

Enable G.729A codec capability for Digital Fax.

How-to:

In order to enable G.729A signaling for Digital Fax please proceed as follow:

1. Edit the file <StonevoiceAS>\Apps\StoneFax\Server\System\StoneFax.ini

2. Add one of the following parameters to the section [Impostazioni]:

    a) To enable only G.729A as audio codec:

     T38_LOG_OPTIONS= --sip-audio G.729  

    b) To enable both G.711 and G.729A as audio codecs:

     T38_LOG_OPTIONS= --sip-audio G.711-Alaw-64k --sip-audio G.711-ulaw-64k --sip-audio G.729

The row should appear similar to the following:

[Impostazioni]
T38_LOG_OPTIONS= --sip-audio G.711-Alaw-64k --sip-audio G.711-ulaw-64k --sip-audio G.729

Save and close the StoneFax.ini file

4. Stop and Start the Digital Fax service in the page Fax Server |  Manage Service [Stop/Start]

5. Perform a test

IMPORTANT NOTE: G.729 cannot be used to send/receive faxes in voice passthrough mode. It can be enabled in certain scenarios to allow the initial call handshake with PBX or voice gateways. Actually, a voice call established in G.729 codec should immediately switch to a T.38 session to allow a proper fax transmission/reception.