[VoiceOps] FAX over VOIP networks

Scott Berkman scott at sberkman.net
Fri Aug 28 13:03:03 EDT 2009



The key really is g.711 (usually u-law) and low (read no) latency/jitter
unless you can fully interop T.38 across the network.  Most fax machines
will auto-negotiate to the lower speeds when needed, but low to middle end
Brother machines may be a major exception as they often have a poor T.30




From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
On Behalf Of Kenny Sallee
Sent: Friday, August 28, 2009 12:06 PM
To: voiceops at voiceops.org
Subject: [VoiceOps] FAX over VOIP networks


So the last thread on T38 made me want to start a thread on FAX over IP via
an ATA or something like the Adtran TA900 series.


>From our experience, to be most successful w/ FAX over IP of any sort we've
found that if you:


1.) Set baud to lowest setting fax can handle

2.) Lower print quality settings if possible

3.) Make sure to force G711

4.) Disable ECM and VAD on fax/modem tone detection


And then cross your fingers fax's are successful and consistent.  Anyone
else have other experiences or suggestions?


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