[VoiceOps] T38 over Sip

[Gabriel Kuri]

In our experience, FAXing via T.38 over IP works fairly reliably, as 
long as V.34 (aka Super-G3) is disabled on the FAX machine connected to 
the VoIP adapter/gateway. We use Cisco/Linksys adapters, so I can't 
speak for other brands, perhaps there are some out there that don't have 
a problem with Super-G3 FAX machines, but the Cisco/Linksys ATAs are 
extremely unreliable if V.34 is supported and/or enabled on the FAX 
machine connected to the ATA.

I'd definitely like to hear if anyone else has experience with other 
T.38 capable ATAs that work reliably with Super-G3 FAX machines?

Gabe

Sorensen, Marty wrote:
> Weve had some good luck with fax machines (newer models) that state that they are voip compatible.  The model was a Lexmark X5650...I believe it was under $200. We also used a Quintum ATA instead of the crappy Cisco ones.
> 
> -----Original Message-----
> From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org] On Behalf Of Scott Berkman
> Sent: Friday, August 28, 2009 8:53 AM
> To: 'Kevork Belian'; 'Junaid Hattia'; 'Alex Balashov'
> Cc: voiceops at voiceops.org
> Subject: Re: [VoiceOps] T38 over Sip
> 
> This isn't a great work around because it's almost impossible to tell your
> customers "Oh just have the other side turn off ECM on their fax machine and
> force the transmit speed to the lowest possible setting".  If they even
> understand what that means, which they won't, they probably don't have
> access/permissions to make the settings change on the machine.
> 
> Every time I have fax issues with a customer I am tempted to tell them just
> how well Email works over IP :).  I know, faxes are legal documents and
> emails are not (in GA anyway), but that just doesn't make any sense to me
> logically.
> 
> 	-Scott
> 
> -----Original Message-----
> From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
> On Behalf Of Kevork Belian
> Sent: Friday, August 28, 2009 10:20 AM
> To: Junaid Hattia; Alex Balashov
> Cc: voiceops at voiceops.org
> Subject: Re: [VoiceOps] T38 over Sip
> 
> Disable ECM on Cisco gear (AS5400 and the exit gateway of PGW). 
> You can disable ECM on the fax machine also.
> 
> 
> -----Original Message-----
> From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
> On Behalf Of Junaid Hattia
> Sent: Friday, August 28, 2009 3:03 PM
> To: Alex Balashov
> Cc: voiceops at voiceops.org
> Subject: Re: [VoiceOps] T38 over Sip
> 
> Attached is a call flow....
> 
> The basic prolem is that a fax call cannot be completed...
> 
> 
> On 2009/08/28 1:29 PM, "Alex Balashov" <abalashov at evaristesys.com> wrote:
> 
>> There are many things that could be wrong there.  Problem description 
>> is not sufficient.
>>
>> Junaid Hattia wrote:
>>
>>> Howdy
>>>
>>> Ok so im trying to t38 over sip working with no luck
>>>
>>> My test lab is as follows:
>>>
>>> Pangea box connecting to a AS5400 via PRI, which then traverses an 
>>> Acme Session director, broadsoft and then exits via PGW(SS7)
>>>
>>> The sniffer capture says ³failure to train²
>>>
>>>
>>> Any ideas?
>>>
>>> --
>>>  junaid
>>>
>>>
>>>
>>>
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