[Asterisk-Users] Modem and Fax over VoIP

[Steven Critchfield]

On Mon, 2003-10-06 at 15:12, Andrew Joakimsen wrote:
> Fax with G711 works fine. Modem will be slow, but if you really need
> to
> use it slown them down to 28.8 or 33.6

This depends on if you have consistent latency and otherwise no jitter.

On my 12 hop link with the office over a cable modem, it is iffy to get
a modem connection up. The connection occasionally claimed 14400, but
never was over 1200 in actual output. So again, this is chancy at best
and in the end will result in longer calls between fax machines. A cheap
modem, and a $10 scanner will solve the problem and keep you faxes going
out fast.

> > Steven Critchfield <critch at basesys.com> wrote:
> > 
> > > On Mon, 2003-10-06 at 10:12, Eduardo Goncalves wrote:
> > > > Hello,
> > > >
> > > > 	I have the fowling scenario:
> > > >
> > > > fxs[asterisk1]-----iax-----[asterisk2]e1----e&m---PSTN
> > 
> > >
> > > If asterisk2 is your only access to the PSTN, then it doesn't make a
> lot
> > > of sense to do fax over VoIP. Put a couple of modems on asterisk2
> with
> > > matching FXS ports and learn to use Hylafax.
> > 
> > 	I can't. Because asterisk1 is at a remote site. And the only
> access
> > to PSTN at this remote site is trough asterisk2.
> > 
> > > performance out of the faxing and potentially lower bills. Also it
> is
> > > more flexible. Not to mention that the bandwidth over VoIP to make
> data
> > > quality calls is around 80k of VoIP to get flakey 9.6k. Do you need
> to
> > > waste 10x bandwidth for sub par functionality?
> > 
> > 	Is it possible to config asterisk1 to change to g.711 only when
> a
> > fax transmission is detected?
> > 
> > Thanks
> > Eduardo
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> 
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-- 
Steven Critchfield  <critch at basesys.com>