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

["Bruce Whittaker" <bwhittak@xxxxxxxxxxxxx>]

Hmm...

I'm new to both FoIP and VoIP. A quick question for you.

The implementation they are looking at putting in here will be VoIP, should they have a network issue, 
they intend to flip faxes over to the normal phone lines. If I migrate to T.38, will it work over the normal phone lines as well ?

Cheers,

Bruce Whittaker,
CASS Support,
Extension  34193
External     (02) 9269 4193.
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Lee Howard <faxguy@xxxxxxxxxxxxxxxx> Sent by: hylafax-users-bounce@xxxxxxxxxxx 31/01/2005 20:33

To:        Alexandre Aractingi <aaractingi@xxxxxxxxxxxxxx>         cc:        awilliam@xxxxxxxxxxxxx, Scott Bishop - Personal <scott@xxxxxxxxx>, Liste Hylafax <hylafax-users@xxxxxxxxxxx>         Subject:        Re: [hylafax-users] Fax across VoIP lines working for anyone?

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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