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

[Brian Foster]

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
>>>
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
>>> 
>>> 
>>>
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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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>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
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>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
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>
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