[VoiceOps] Dynamic T1 Faxing over IP

[anorexicpoodle]

This is a topic that has been very near and dear to my ulcers for the
last few months. Not necessarily with the Adtran TA900 but with any
residential class ATA as we endeavor to improve the fax experience
across our network as a whole. 

What I've learned so far:

1: If you control the entire path, pass-through works just as well as
T.38, if you don't, T.38 end to end is the only way to fly.

2: Linksys/CISCO are the best behaved ATA's when it comes to fax

3: g711 pass-through seems to work best at 9600 baud with the bells and
whistles turned off and your fax machine as lobotomized as possible

4: T.38 seems to work best with the fax machine left alone at 14.4

5: Most of the big breakdowns occur between the fax machine and the
FXS/SLIC. Strange byes, local CNG not detected, etc etc. 


If anyone has any pearls of wisdom to chime in with I am all ears. 

-anorexicpoodle



On Wed, 2010-12-15 at 15:46 -0800, Jim Gurol wrote:
> 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. 
> 
>  
> 
> Jim
> 
>  
> 
> 
> 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 helpful.
> 
> Any help is greatly appreciated.
> 
> Thanks,
> 
> Jeff
> 
> 
> 
> 
>  
>  
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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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