[VoiceOps] Dynamic T1 Faxing over IP

Jim Gurol jim at californiatelecom.com
Wed Dec 15 18:46:03 EST 2010

We are using this successfully on Adtran TA900 series analog ports. Not even
doing anything special configs. It just works.

I tried using other solutions such as the LINKSYS/CISCO ATA and Handytone
with/without T.38 and it just is not reliable. 

For some reason the Adtran TA900 seems to work (no T.38) consistently. Not
sure what they figured out here, but no complaints for over 2 years.


There is an ATA device called FaxxBochs that works over IP, but it is
expensive and I believe you pay a monthly fee. 




From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
On Behalf Of Lee Riemer
Sent: Wednesday, December 15, 2010 3:21 PM
To: voiceops at voiceops.org
Subject: Re: [VoiceOps] Dynamic T1 Faxing over IP


Connect the FAX to an analog port on the TA900.  Disable echo cancellation,
alc, plc, nls, and lower tx/rx gain as far as it will go.  You shouldn't
need T.38 on a T1 with QoS enabled and no public Internet.  Disable any
(super)G3 capabilities in the fax machine.

On 12/15/2010 4:53 PM, Jeff Anderson wrote: 

We are experiencing a fair amount of heart burn attempting to support faxing
over our Dynamic T1 product. Some customers it works great and others have
frequent problems.

We currently support dynamic T1's using both Adtran TA900 series and Cisco
IAD2400 services routers. The customers fax machines will connect to their
PBX that has a PRI to an IAD/TA. We have the IAD/TA configured for SIP
signaling to an Acme SBC selecting T.38 as the preferred codec with fallback
to g.711 pass-through. We can force a slower speed, disable error
correction, disabled VAD but in the end still have very inconsistent
results. From a network perspective the QoS is matching and queuing
correctly, the circuits are clean and the IP SLA gives us no reason to
believe they are having any network drops or jitter.

I was wondering if others who have experience with faxing over IP could
share what they have learned works best or anything else that may be

Any help is greatly appreciated.



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Lee Riemer
Director of Technical Operations
Bestline Communications, L.P.
Voice: 1+512.328.9095
Fax: 1+512.328.0038
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