[VoiceOps] Grandstream ATAs for Faxing

David Wessell david at ringfree.biz
Wed Sep 10 09:49:53 EDT 2014

Oh god. We've had horrid results with the Faxback platform. We've used it
with two resellers and it's been consistent downtime. That could be the
resellers and not the platform itself.

I agree on T.38 though. We disable it by default and use G711 over
Mediatrix or Adtran ATA's with pretty good results.


On Wed, Sep 10, 2014 at 8:32 AM, Colton Conor <colton.conor at gmail.com>

> For faxing, HTTPS faxing using Audiocodes adapters with Faxback technology
> has been the only reliable solution for us. Not sure about credit cards.
> T38 seems to be a joke.
> On Tue, Sep 9, 2014 at 9:39 AM, Jamey <jamesleo at socket.net> wrote:
>> Hello,
>> We having been utilizing Grandstream ATAs (HT70X and GXW400X) as analog
>> hand offs with our Hosted Services built on the Broadworks platform and
>> Sansay's SBC.  We've had regular trouble when using them with fax and
>> credit card machines.  We support t38 but have often gone to g711
>> pass-through.  Echo cancellation is disabled.  We've tested them with the
>> various jitter buffer lengths, Rx/Tx setting adjustments and various
>> impedance values.  The results seem very inconsistent.  This is site to
>> site as well as inconsistent results at the same site.  The faxing/credit
>> card transmissions will work for a period of time and then begin failing
>> without any changes.
>> We are a CLEC who control the QoS from device out to the PSTN.  We've
>> found that replacing the ATA with a Adtran TA90X usually corrects the
>> issues but this is not a cost effective solution.
>> Anyone have similar experiences with Grandstream ATAs?  Anyone have
>> reliable VoIP faxing with their ATAs? If anyone has been successful
>> integrating the Grandstreams, I would be interested in knowing what config
>> changes you've made from their default.  Which models you've used with
>> which firmware?
>> Anyone have other ATA's that seem to work well for faxing and credit card
>> machines?  We'd like to keep our offering to as few manufacturers as
>> possible that can offer 2, 4, 8+ FXS ports.
>> Thanks for any and all recommendations.
>> Jamey
>> Socket Telecom
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