Re: [hylafax-users] Faxing over VOIP?

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

andrea.lanza@xxxxxxxxxxx wrote:

> My scenario involves 2 server on the same private Lan, so we have in
> general no problem at all about latency, delay and bandwith.

It is certainly possible to have a LAN where there will be no problem 
with jitter.  However, not all private LANs will be so lucky.  So it's 
important to point out that just because passing fax audio over a LAN 
VoIP connection works okay for one person it may not necessarily work 
for another.

For an example, I've ran a few iaxmodems over a LAN connection before, 
and as I started adding additional iaxmodems I noticed a corresponding 
increase in network jitter.  These iaxmodems are constantly busy, and so 
network traffic by them is guaranteed.  And it appeared fairly clear 
that as I was adding iaxmodems I was also increasing network traffic and 
thus the likelihood that some collission would occur on the switch/hub 
and cause jitter.  So while one or two iaxmodems in that scenario seemed 
to work very well with very, very little noticeable jitter... as I 
increased the iaxmodems to, say, five ... that's when I started noticing 
more problems (not constant problems, but more noticeable than before).

Thanks,

Lee.

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