On 03/13/2010 02:03 AM, Jeff Brower wrote: > 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. > I think you will find Grandstream uses TI silicon, but all their own software. T.38 is an awful loose spec, so different implementations tend to behave quite differently. The flavour of a Grandstream packet exchange doesn't appear to be the same as a Telogy exchange.
Steve -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
