[Freeswitch-users] Fax Issues with Cisco SPA112 and T.38

Wed May 16 07:51:52 MSD 2012

I will look into this, and I am testing it with an older fax right now
because I brought the ATA home from the office to work on. I think the test
fax at the office supports newer standards.

Thanks for correcting the spelling errors, I had started digging through
some boxes for my Atari 2600 to fit into the equation. Lol.

Much appreciated Brian.

Thanks,

-Chris

___________________
Mobile Reply

On May 15, 2012, at 10:14 PM, Brian Foster <bdfoster at endigotech.com> wrote:

s/Atari/ATA/g
s/pro ably/probably/

Probably other mistakes in there. Gotta love android spell check.

-BDF
On May 15, 2012 10:10 PM, "Brian Foster" <bdfoster at endigotech.com> wrote:

> I think your problem is probably the fact that your FAX machine doesn't
> support t.38. In that case you'd have to have freeswitch transcode from
> pcmu to t.38. It doesn't give good results when your server isn't on the
> LAN that your ATA is on. The point really of transmitting to flowroute as
> t.38 is to get better results when transmitting a FAX via VoIP. You would
> essentially be taking a detour to get a transcode and it really doesn't
> help because like I said your server is somewhere out in cyberspace. Also
> mix in that it is indeed a VPS, and that's pro ably what you are seeing the
> result of. Maybe the Atari actually transcodes to t.38 locally, I'm not
> sure and I don't have enough experience with that device to be able to tell
> you. If the ATA is indeed locally trandcoding to t.38 then my suggestion
> would be to bypass media on the server and sent it straight to flowroute.
>
> I hope this helps. If you have any questions let us know!
>
> -BDF
> On May 15, 2012 6:52 PM, "Chris Ferreira" <chris at gonumina.com> wrote:
>
>> Hello Brian and Everyone,
>>
>>
>> Here is a link to the siptrace output. Sorry for the delay, it was my
>> birthday and I was away for the weekend.
>>
>>
>> http://pastebin.freeswitch.org/19057
>>
>>
>> Thanks,
>>
>> -Chris
>>
>>
>>
>>
>> On Thu, May 10, 2012 at 10:16 PM, Brian Foster <bdfoster at endigotech.com>wrote:
>>
>>> 1. Run fs_cli and do 'sofia global siptrace on' without quotes. Stay in
>>> the cli and run a call in an instance where it would fail. Make sure your
>>> scroll buffer on your SSH terminal (PuTTY or what ever you have) to
>>> unlimited or something bog like 20K lines. Copy the logs out and put them
>>> on http://pastebin.freeswitch.org. If prompted for a username/password,
>>> please read the dialog box. SpanDSP doesn't have a great ability to be
>>> degugged on the click but it will give is something to go on.
>>>
>>> 2. There usually isn't much you can do as far as ensuring the VPS is
>>> capable of keeping the timing right. VoIP is reliant heavily on a good
>>> timing source. Faxing is even more dependent.
>>>
>>> I'm not really sure what the MOS score is useful for, maybe someone else
>>> can chime in on that.
>>>
>>> Something you need to make sure you are doing (specifically with
>>> flowroute) is making sure you are doing a t.38 reinvite. Flowroute does not
>>> auto detect t.38. Also freeswitch might have to transcode from audio
>>> ulaw/alaw to t.38 if your FAX machine doesn't actually support t.38.
>>>
>>> I don't really know much about the new SPA 112/122's but usually the ATA
>>> has a t.38 passthru mode that is auto detected. That might be what you are
>>> referring to.
>>>
>>> -BDF
>>> On May 10, 2012 2:35 PM, "Chris Ferreira" <chris at gonumina.com> wrote:
>>>
>>>> Hi Bryan,
>>>>
>>>>
>>>> Thanks for your response, much appreciated.
>>>>
>>>>
>>>> 1. I have never had to do a debug other than analyze fs_cli output and
>>>> iv'e never done a sip trace. I have started reading up on how to do these
>>>> on the Wiki and will generate some files to take a look at.
>>>>
>>>>
>>>> 2. I have heard this before about VPS's and even VMWare servers running
>>>> on local physical hardware. I hope to be able to overcome these issues.
>>>>
>>>>
>>>> 3. Other calls work fine throughout the switch and between carriers.
>>>>
>>>>
>>>>
>>>> I don't know if this is a good actual measure of anything, but
>>>> VoIPSpear.com says that the servers MOS Score is a 4.0 .
>>>>
>>>>
>>>> Other than the server running on a VPS, is my setup with the ATA
>>>> registering to FreeSWITCH as an intermediary between Flowroute.com a
>>>> correct practice? Or is there something else I could be doing?
>>>>
>>>>
>>>> I know that if I was not needing to use an Analog Fax machine for
>>>> sending/receiving that I would have other options. But unfortunately the
>>>> Dinosaur must have it's Dial Tone.
>>>>
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> -Chris
>>>>
>>>>
>>>>
>>>>
>>>> On Thu, May 10, 2012 at 2:03 PM, Brian Foster <bdfoster at endigotech.com>wrote:
>>>>
>>>>> 1. Debug tells all. We need the siptrace as well.
>>>>>
>>>>> 2. VPS's are usually bad at sending/receiving faxes even if the media
>>>>> is just being routed through it.
>>>>>
>>>>> 3. You could also look at session timers. Are other calls working?
>>>>>
>>>>> The only real way to know is if we have number 1 in our possession,
>>>>> otherwise we just start guessing.
>>>>>
>>>>> -BDF
>>>>>
>>>>> On Thu, May 10, 2012 at 1:30 PM, Chris Ferreira <chris at gonumina.com>wrote:
>>>>>
>>>>>> Hello All,
>>>>>>
>>>>>>
>>>>>>
>>>>>> I have a FreeSWITCH install running on CentOS 5.6 on a Linode VPS. I
>>>>>> am trying to get my SPA112 (Version 1.1 Firmware) to send faxes (and
>>>>>> eventually receive) successfully. I have the ATA registered as an extension
>>>>>> and it's primary outgoing route is through Flowroute. I have T.38 enabled
>>>>>> on the ATA and I have diabled ECM on the analog fax machine. All of the
>>>>>> CDR's in Flowroute show that the test faxes are all ending their calls at
>>>>>> 39 seconds.
>>>>>>
>>>>>>
>>>>>> I can post screen shots of the ATA config or provide any other config
>>>>>> info.
>>>>>>
>>>>>>
>>>>>> Is there something I am missing, or should this setup work?
>>>>>>
>>>>>> I have poked around for a while for info, but unlike the PAP2T there
>>>>>> is little info on these SPA112's. This is my first post asking for help as
>>>>>> I usually try to resolve things on my own. But for this, I will defer
>>>>>> to everyone's experience.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> -Chris
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
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>>>>>>
>>>>>> 
>>>>>> 
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>>>>>
>>>>>
>>>>> --
>>>>> Brian D. Foster
>>>>> Endigo Computer LLC
>>>>> Email: bdfoster at endigotech.com
>>>>> Phone: 317-800-7876
>>>>> Indianapolis, Indiana, USA
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