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 ?failure to train?
Any ideas?
-- junaid
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