Re: [hylafax-users] Fax across VoIP lines working for anyone?

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2005.01.31 01:18 Alexandre Aractingi wrote:
> > On Sat, 2005-01-29 at 11:50 -0700, Scott Bishop - Personal wrote:

> > Fax, like data-over-analog, is simply too time and encoding
> sensitive to work reliably over VOIP.
>
> Well you may want to discuss that on the t38 mailing list, the guys
> there seem to think otherwise :-)

Generally speaking T.38 is not considered *VoIP*, but rather is called 
*FoIP*.  There is a difference, the difference being the codec being 
used.  VoIP implies that the raw audio is packetized and transmitted 
over IP (e.g. ulaw/alaw).  With FoIP the data of the fax call is 
relayed over IP (T.38).  There is no "audio" per-se in a T.38 channel.

So you're right, and he's right.

Some environments can, to their perception, have reliable faxing with 
VoIP (ulaw) as Steve Underwood mentioned, although such tends to 
require a fairly limited use of VoIP.  FoIP (T.38) solves the problems 
that VoIP technology introduces for faxing, and is to be considered the 
"right" way to do faxing over IP networks.

Lee.

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