[VoiceOps] Grandstream ATAs for Faxing

Tim Jackson jackson.tim at gmail.com
Tue Sep 9 11:23:20 EDT 2014

We've had "OK" success with Cisco SPA112 ATAs.. I only say OK because
there are a ton of caveats to it.. Any re-invite towards the ATA
results in a momentary audio pause (just silence in the RTP, no RTP
loss, awesome).. Provisioning? Need a signed cert from Cisco to
support HTTPs.. LLDP-MED support seems to still be broken even in the
latest releases..

Other than the annoyances there, they're actually not too bad. Good
success with T.38 (but we generally just use 711u), and no real issues
with credit card machines, etc..


On Tue, Sep 9, 2014 at 7:39 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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