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Faxing with VOIP

Last Updated: Jun 20, 2013 05:10PM EDT

 

Faxing over VOIP is not recommended as the VOIP codecs can alter the fax tones/signals and also latency on the network can affect the timing of the fax signals. Here's web page that describes the problem in more detail:
 
http://www.soft-switch.org/foip.html

The Mainpine folks also have an excellent blog post on the problems with VOIP at 

http://www.mainpine.com/blog/fax-voip-and-the-perils-of-poor-audio-quality

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