[asterisk-users] t38 ATA

[Jeff Brower]

Steve-

> On 03/13/2010 12:00 AM, Alexandru Oniciuc wrote:
> >
> > Hello,
> >
> > I need a hand in choosing a small ATA, even with one FXS port, that
> > should do only fax with T38.
> >
> > I’ve tried Grandstream (ht286 model) but the faxes go out without ECM,
> > even if the Fax machine has ECM enabled.
> >
> > Is there anyone that can recommend an ATA that might do the trick?
> >
> > Thanks,
> >
> > Alex
> >
> The Grandstreams do T.38 quite well, and they do support ECM. It is
> probably your service provider which is blocking ECM. Many of them do.

I've heard that Grandstream uses TI Telogy DSP devices, which might help explain
their reliable operation at T.38 data level.  Telogy got started in early 1990s and
was one of the first outfits to make it big in VoIP.  They were acquired by TI in
1998 for about 850m.  During the late 1990s period, Telogy did a lot of work on FoIP,
including helping to write RFCs, contributions to ITU study groups, etc.

-Jeff