Is FoIP a good solution for faxing from a Co-location?

I have some customers that want to use Fax Over IP to send faxing from a Colocation where their Exchange server is stored. Is this a good solution? I have heard a lot of bad things about FoIP.

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the usual reason for foip is cost saving.  i assume your customer is thinking to send fax via internet to some sip fax gateway providers for fax termination.  as fax data is sent over internet, idd cost is thus reduced.

in any case, successful rate of foip depends very much on the internet connection from your customer's colocation to the fax gateway.  fax data could not tolerate network latency and jitter  

foip could be carried out in two ways: g711 faxing or t.38

in g711 faxing, fax data is transmitted just like voice udp packets in the uncompressed g711 codec.  it is the simplest implementation, but there are some restrictions:  1)  the fax rate is mostly below 14.4kps, 2) error correction mode is usually not supported, 3) must use uncompressed code g711 that takes up more bandwidth, etc.

t.38 is the protocol designed to handle fax over internet, but not widely implemented because  both end points have to support t.38.      


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