[asterisk-users] R: t38 ATA

[Klaus Darilion]

Am 12.03.2010 19:05, schrieb Alexandru Oniciuc:
> Hi Steve,
>
> the remote device is an Hylafax Server that does ECM.

How is Hylafax connected to VoIP?

regards
Klaus

> The sending fax
> device, that's attached to the ATA, is a Philips fax machine with ECM
> enabled. If I send with the same machine but attached to a Patton
> 4114 with T38 enabled my faxes go to the other end with ECM enabled
> and with no errors.

It would be interesting how the T.38 SDP differs between Grandstream and 
Patton.

regards
klaus

>
> I've also tested the Grandstream ATA with analog fax machines
> attached to the PSTN and the results are the same: bad quality faxes
> or no faxes at all. Again, tested with the Patton device I get no
> errors.
>
> In this case I think it's the Grandstream.
>
> Best Regards, Alex
>
> ________________________________________ Da:
> asterisk-users-bounces at lists.digium.com
> [asterisk-users-bounces at lists.digium.com] per conto di Steve
> Underwood [steveu at coppice.org] Inviato: venerdì 12 marzo 2010 18.01
> A: Asterisk Users Mailing List - Non-Commercial Discussion Oggetto:
> Re: [asterisk-users] t38 ATA
>
> 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.
>
> People complain a lot about Grandstream, but its mostly their
> phones. Their ATA are amongst the better ones. Sadly, that doesn't
> mean an awful lot, as most ATAs are quite nasty.
>
> Steve
>
>
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