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

Fri May 11 09:07:28 MSD 2012

Check this out  http://wiki.freeswitch.org/wiki/Fs_logger.pl This is very
useful tool. Very handy.

Also, paste here your dialplan snippet. First, i will try passthru mode

<extension name="t38_passthru">
 <condition field="destination_number" expression="^1236$">
   <action application="export" data="t38_passthru=true"/>
   <action application="bridge" data="sofia/<profile>/<extension>"/>
 </condition>
</extension>

to catch re-invite from your ITSP try

ngrep -d -qt -W byline -i t38 -o t38_debug.pcap

2012/5/11 Brian Foster <bdfoster at endigotech.com>

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