[WXC/VFX] fax over vfx and trixbox

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icepicknz

309 posts

Ultimate Geek

Trusted

#29570 12-Jan-2009 09:58

Anyone had luck receiving faxes with trixbox and VFX service.
I'm using g711 codec, have less than 2ms delay to the vfx server from my asterisk server.

Just doesnt seem to receive, I'm not sure if the issue is trixbox or VFX?

thanks
Barry

Barry Murphy
ISPMap - New Zealand ISP map
Vibe Communications LTD - Business ISP and Wholesale Carrier

Any comments made by myself don't reflect the views of my employer, they are mine and mine alone

bender

220 posts

Master Geek

#189054 12-Jan-2009 18:07

It will be something related to your settings - I have lots of trixbox customers out there who use faxing fine. Your first step is to upgrade Trixbox to the latest version, as older versions have severe issues with faxing. You won't be able to use t.38 either because that's not supported properly until Asterisk 1.6 (currently Trixbox is on Asterisk 1.4). Following that, are you trying to receive into PDF's in trixbox, or pass through to an ATA connected to a regular fax machine?
You also need to set an option on the trunk or the incoming route (can't remember sorry and I'm not at work so I can't check) but it enables a delay on incoming calls to detect fax tones - this needs to be turned on so that trixbox will recognise a fax and start to receive it instead of processing it as a voice call.

icepicknz

309 posts

Ultimate Geek

Trusted

#189064 12-Jan-2009 19:02

Yeah I have it set right in trixbox, it answers the call as it detects fax, NvFax then kicks in, and it hangs up like 3 seconds after.
I'm just trying to update to asterisk-1.4.22-3, will see if that fixes it.

Barry Murphy
ISPMap - New Zealand ISP map
Vibe Communications LTD - Business ISP and Wholesale Carrier

Any comments made by myself don't reflect the views of my employer, they are mine and mine alone

icepicknz

309 posts

Ultimate Geek

Trusted

#189074 12-Jan-2009 20:38

Unfortunately I believe the issue may be from the trixbox running inside a VMWARE instance, even though the box is not doing anything at all I'm getting this:

Opened pseudo zap interface, measuring accuracy...
99.916206% 99.982521% 99.891403% 99.974121% 99.913185% 99.994232% 99.989151%
99.926956% 99.981934% 99.911041% 99.969231% 99.915237% 99.986137% 99.993469% 99.904884%
99.974808% 99.914055% 99.995712% 99.997757% 99.933105% 99.994827% 99.928413% 99.990143%
99.921677% 99.997757% 99.982712% 99.913765% 99.977242% 99.872360% 99.986137% 99.929688%
100.000000% 99.985550% 99.932327% 99.859764% 99.786034% 99.974510% 99.906738% 99.979691%
99.994827% 99.900970% 99.974998% 99.905762% 99.993645% 99.936035% 99.996773%
--- Results after 46 passes ---
Best: 100.000 -- Worst: 99.786 -- Average: 99.949728, Difference: 99.968257

It's suggested the average should not be below 99.98, though I have no echo issues, no load issues or issues with anything other than FAX. I was originally running trixbox on this system before I thought it was a waste and then setup vmware. When the system was souly trixbox fax didnt work and did the same sort of thing.

If I snoop the PABX I hear fax tone for about 3 seconds then it hangs up, so I can only assume they not talking the same language or something

Barry Murphy
ISPMap - New Zealand ISP map
Vibe Communications LTD - Business ISP and Wholesale Carrier

Any comments made by myself don't reflect the views of my employer, they are mine and mine alone

bender

220 posts

Master Geek

#189076 12-Jan-2009 20:53

Trixbox will have issues running in a Virtual Machine as it doesn't get a true hardware clock for timing - it's only recommended for demonstration purposes. This is likely to be the problem as when you are connecting remote phones to Trixbox it is only proxying traffic, but faxing is being processed locally on the machine so it needs a reliable timing source.

icepicknz

309 posts

Ultimate Geek

Trusted

#189080 12-Jan-2009 21:04

Yeh, I may setup another box to see if this is the case because i have another few machines of hte same spec, dual xeon 2.4ghz with 4 gb ram... It's handling g729 etc with no issues, though it's a very quite node, 3 VPS's, 2 test platforms for pre-production and a small pabx with 10 lines.

Barry Murphy
ISPMap - New Zealand ISP map
Vibe Communications LTD - Business ISP and Wholesale Carrier

Any comments made by myself don't reflect the views of my employer, they are mine and mine alone