I know this a thorn in everyones flesh, I would like to know of experiences with T38 Voip Faxing. We have had good and bad. Those that don't work just don't and they don't even want to troubleshoot and just switch over to an Analog line for Fax. We mostly use AudioCodes and Sipura T38 ATAs. Any of you folks do T38 and whats the experience like.
Doesn't work. On 01/06/2010 07:00 PM, Ujjval Karihaloo wrote:
I know this a thorn in everyones flesh, I would like to know of experiences with T38 Voip Faxing. We have had good and bad. Those that don?t work just don?t and they don?t even want to troubleshoot and just switch over to an Analog line for Fax. We mostly use AudioCodes and Sipura T38 ATAs.
Any of you folks do T38 and whats the experience like.
_______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops
-- Alex Balashov - Principal Evariste Systems Web : http://www.evaristesys.com/ Tel : (+1) (678) 954-0670 Direct : (+1) (678) 954-0671
It seems to be hit and miss, certainly not 100%, but better than trying to use either PCMU or PCMA over the commodity Internet for FAXing. PCMU/PCMA might work over a local private LAN with QoS enabled and the jitter down to almost nothing. The biggest issue I've seen with T38 is the ATA's inability to properly negotiate a Super-G3 fax down to G3 or slower speeds. In our experience, you need to disable the Super-G3 feature of the FAX machine to slow it down to either 14.4 or 9600 and disable ECM. Many of the newer FAX machines have a "VoIP Compatibility" mode which essentially slows it down to 9600 and disables ECM. We predominantly use Cisco/Linksys/Sipura ATAs, but would like to hear if anyone has better experiences with other ATAs, particularly in business environments where there's potentially a lot of FAXing. Cheers, Gabe On Wed, Jan 6, 2010 at 6:00 PM, Ujjval Karihaloo <ujjval at simplesignal.com> wrote:
I know this a thorn in everyones flesh, I would like to know of experiences with T38 Voip Faxing. We have had good and bad. Those that don?t work just don?t and they don?t even want to troubleshoot and just switch over to an Analog line for Fax. We mostly use AudioCodes and Sipura T38 ATAs.
Any of you folks do T38 and whats the experience like.
_______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops
We are having good luck with the Cisco 2431 and Adtran TA900 series with faxing. We won't touch faxing if the customer is not OnNet with us. The best success is if you have A to Z control of the customer's connection. Richey -----Original Message----- From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org] On Behalf Of Gabriel Kuri Sent: Wednesday, January 06, 2010 7:15 PM To: Ujjval Karihaloo Cc: voiceops at voiceops.org Subject: Re: [VoiceOps] VoIP T38 Fax reliability It seems to be hit and miss, certainly not 100%, but better than trying to use either PCMU or PCMA over the commodity Internet for FAXing. PCMU/PCMA might work over a local private LAN with QoS enabled and the jitter down to almost nothing. The biggest issue I've seen with T38 is the ATA's inability to properly negotiate a Super-G3 fax down to G3 or slower speeds. In our experience, you need to disable the Super-G3 feature of the FAX machine to slow it down to either 14.4 or 9600 and disable ECM. Many of the newer FAX machines have a "VoIP Compatibility" mode which essentially slows it down to 9600 and disables ECM. We predominantly use Cisco/Linksys/Sipura ATAs, but would like to hear if anyone has better experiences with other ATAs, particularly in business environments where there's potentially a lot of FAXing. Cheers, Gabe On Wed, Jan 6, 2010 at 6:00 PM, Ujjval Karihaloo <ujjval at simplesignal.com> wrote:
I know this a thorn in everyones flesh, I would like to know of experiences with T38 Voip Faxing. We have had good and bad. Those that don't work just don't and they don't even want to troubleshoot and just switch over to an Analog line for Fax. We mostly use AudioCodes and Sipura T38 ATAs.
Any of you folks do T38 and whats the experience like.
_______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops
_______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops
On 01/06/2010 07:15 PM, Gabriel Kuri wrote:
It seems to be hit and miss, certainly not 100%, but better than trying to use either PCMU or PCMA over the commodity Internet for FAXing. PCMU/PCMA might work over a local private LAN with QoS enabled and the jitter down to almost nothing.
Agreed about T.38 vs. analog pass-through.
The biggest issue I've seen with T38 is the ATA's inability to properly negotiate a Super-G3 fax down to G3 or slower speeds. In our experience, you need to disable the Super-G3 feature of the FAX machine to slow it down to either 14.4 or 9600 and disable ECM. Many of the newer FAX machines have a "VoIP Compatibility" mode which essentially slows it down to 9600 and disables ECM.
There's been an enormous explosion of Super G3 machines in the last few years; asking users to disable SG3 is not really tenable. Fax over IP is one of those things that, like anything else, can be gotten to work passably with enough spiritual commitment. But it's just not worth it. Hand the customers some resale analog lines or what have you and be done with it. -- Alex Balashov - Principal Evariste Systems Web : http://www.evaristesys.com/ Tel : (+1) (678) 954-0670 Direct : (+1) (678) 954-0671
Anyone used faxback - they do T38 fax over https .... Any experience with them? Their claim is it works 100% of the time On Jan 6, 2010, at 7:37 PM, "Alex Balashov" <abalashov at evaristesys.com> wrote:
On 01/06/2010 07:15 PM, Gabriel Kuri wrote:
It seems to be hit and miss, certainly not 100%, but better than trying to use either PCMU or PCMA over the commodity Internet for FAXing. PCMU/PCMA might work over a local private LAN with QoS enabled and the jitter down to almost nothing.
Agreed about T.38 vs. analog pass-through.
The biggest issue I've seen with T38 is the ATA's inability to properly negotiate a Super-G3 fax down to G3 or slower speeds. In our experience, you need to disable the Super-G3 feature of the FAX machine to slow it down to either 14.4 or 9600 and disable ECM. Many of the newer FAX machines have a "VoIP Compatibility" mode which essentially slows it down to 9600 and disables ECM.
There's been an enormous explosion of Super G3 machines in the last few years; asking users to disable SG3 is not really tenable.
Fax over IP is one of those things that, like anything else, can be gotten to work passably with enough spiritual commitment. But it's just not worth it. Hand the customers some resale analog lines or what have you and be done with it.
-- Alex Balashov - Principal Evariste Systems Web : http://www.evaristesys.com/ Tel : (+1) (678) 954-0670 Direct : (+1) (678) 954-0671 _______________________________________________ VoiceOps mailing list VoiceOps at voiceops.org https://puck.nether.net/mailman/listinfo/voiceops
On 1/6/10 7:36 PM, Alex Balashov wrote:
not worth it. Hand the customers some resale analog lines or what have you and be done with it.
That's usually what we do. Today a customer approached us who is going to be in a unique situation. The telephone poles feeding his location are going to be torn down, and replacing the connection with underground cabling is at their cost ($5k). We're going to serve his voice and data needs with Wi-MAX, but this means zero ability to have an analog line for fax. This discussion seems to be focused around and ATA doing T.38, and we have little experience with that. However T.38 for fax delivery to and from servers works great. -- Carlos Alvarez TelEvolve 602-889-3003 Advanced phone services simplified
On Thu, Jan 7, 2010 at 1:00 AM, Ujjval Karihaloo <ujjval at simplesignal.com> wrote:
I know this a thorn in everyones flesh, I would like to know of experiences with T38 Voip Faxing.
Links that may be of your interest: Fax Over IP Task Group Problem Statement: http://tools.ietf.org/html/draft-jones-sip-forum-fax-problem-statement-00 SIP Forum FAX-OVER-IP (FoIP) TASK GROUP charter: http://www.sipforum.org/content/view/310/252/ Cheers, -- Victor Pascual ?vila
participants (6)
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abalashov＠evaristesys.com -
carlos＠televolve.com -
gkuri＠ieee.org -
mylists＠battleop.com -
ujjval＠simplesignal.com -
victor.pascual.avila＠gmail.com