FoIP (Fax over IP) refers to the transportation of faxes
over VoIP networks.
Fax was designed to analog networks, so it does not work really well in
VoIP networks. The reason for this is that communication through fax
uses the signals in a different way than the traditional voice
communication. When the analog voice communication is digitalized and
compressed with the help of VoIP technology, it is optimalized to
transmit voice instead of fax. So there are plenty of things to take
into consideration using a VoIP telephone system.
If you want to send faxes over VoIP networks (use FoIP) with your old
fax machine, you need to connect it to the VoIP phone system by using a
VoIP gateway and an ATA that supports T38. T38 is a protocol that is
designed to be able for the fax to forward data on network. Connecting
to computer-based fax (software fax) is also possible, and to choose a
VoIP phone system that supports fax.
In case of switching to a VoIP system, fax can also be used in a way
that fax machine can be connected directly to the existing analog phone
line and bypass the VoIP system.
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