[VoiceOps] Grandstream ATAs for Faxing

Victor Chukalovskiy victor.chukalovskiy at gmail.com
Tue Sep 9 11:33:27 EDT 2014

An alternate route is to put you fax DIDs on a centralized fax-2-email 
platform. Thereby avoiding any ATA-related hassles.

If done properly, will give you very satisfactory fax success rates

On 14-09-09 10:39 AM, Jamey 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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