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3CX PBX • View topic - use 3cx with fax or service
3CX PBX • View topic - use 3cx with fax or service

use 3cx with fax or service

User to User - Answers are provided by the community. 3CX does NOT provide technical support via this forum. Commercial grade support should NOT be expected

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use 3cx with fax or service

Postby mylove4life » Thu Oct 13, 2011 5:01 pm

Hi all, would you use 3CX with a number for fax or just use a fax service and do it that way? I need to allow fax's to come in to opt out of a fax broadcast system, so they have to be 100% reliable for incoming...
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Re: use 3cx with fax or service

Postby KerryG » Thu Oct 13, 2011 5:26 pm

Besides the fact that faxing in and of itself is not 100% reliable no matter how you do it, using 3CX for fax will ONLY work with inbound t.38 fax. If you want something much more reliable, you should look into building a fax server with Brooktrout cards which is probably the most reliable method you can possible available.
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Re: use 3cx with fax or service

Postby mylove4life » Thu Oct 13, 2011 5:37 pm

I new you where going to say that, I think it might be cheaper in the long run to sub this out to a broadcast service.
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Re: use 3cx with fax or service

Postby eagle2 » Thu Oct 13, 2011 11:08 pm

Cisco / Linksys SPA-3102 is working fine with T.38 fax service.
You may receive faxes with built-in fax server (only T.38) and send with traditional fax machine connected to SPA-3102. Other VoIP adapters also should do the job. There is a post how to configure SPA-3102 for T.38 faxes.

If your provider is not supporting T.38 fax (this means G.711a/µ codec or also referred as T.30) you can't use built-in fax server, but still may receive/send faxes via traditional fax machine connected to SPA-3102. The reliability is not so high as with T.38.

Earlier (until version 8 ) the 3CX server was able to send / receive faxes using MS Fax service.

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Re: use 3cx with fax or service

Postby sigma1 » Sun Oct 16, 2011 3:55 pm

KerryG wrote:Besides the fact that faxing in and of itself is not 100% reliable no matter how you do it, using 3CX for fax will ONLY work with inbound t.38 fax. If you want something much more reliable, you should look into building a fax server with Brooktrout cards which is probably the most reliable method you can possible available.


I completely disagree with the above post. It is clearly self-promoting another product that they sell.

Inbound faxing will work only via T38 either using a VoIP provider (FoIP) or if you have a on-network FXO adapter such as the Patton/Grandstream (the linksys spa3102 works well too).

For outbound faxing all you need if you would like to use a traditional fax machine simply use an FXS adapter such as a PAP2T, Grandstream GXW4004. If you need outbound faxing directly using your desktops, deploy Microsoft faxing and invest $15 on a pci moded to put in the server. Works perfectly and will save you a ton of money.
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Re: use 3cx with fax or service

Postby pogue1000 » Mon Oct 24, 2011 3:14 pm

I was never able to get the Grandstream 4004 to work with outbound faxing via Nexvortex. I paid for a support contract to 3CX in hopes that it would happen but they werent able to make it happen, was an expensive venture with the hardware and support costs so I gave up on outbound voip faxing.

I was told it didnt work because the way the public ip was being sent from Nexvortex (or something like that)
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Re: use 3cx with fax or service

Postby pogue1000 » Mon Oct 24, 2011 3:18 pm

So how would you use a pci modem on the server to use windows faxing? I thought you still needed a phone line to dial out?
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Re: use 3cx with fax or service

Postby complex1 » Mon Oct 24, 2011 4:02 pm

pogue1000 wrote:I was told it didnt work because the way the public ip was being sent from Nexvortex (or something like that)
My opinion is, that if you can make and receive VoIP phone calls by Nexvortex, it also must be possible to send faxes by this provider.
Have you you’re fax machine prepared? Switch ECM off and lower the transmitting speed to 9600Bd?
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Re: use 3cx with fax or service

Postby sigma1 » Mon Oct 24, 2011 4:31 pm

Plug the modem in a FXS adapter (PAP2T not the best but the GXW4004 worked very well for us).

On the NexVortex subject, please check your firewall, they indeed handle it with a particular border gateway manner.

Still, T38 outbound is best but 711 works most of the time too.
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Re: use 3cx with fax or service

Postby pogue1000 » Mon Oct 24, 2011 9:53 pm

here is the final response I was given to by 3CX Support. They did remote control of my server and put some time into it but nothing worked.

As per the notes of the config guide, it is not possible to use the 4004 with a provider. This issue will appear with other FXS devices. It is the provider that will need to use the PUBLIC IP in Contact instead of the private in SDP.

Guess I will try and hook up the 4004 to the modem in the server when I have a second.
Do you just configure one of the lines on the 4004 as an extension?
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Re: use 3cx with fax or service

Postby aesteve » Tue Nov 01, 2011 8:28 pm

Hi all,

Under 3CX and Masquevoz as a VoIP provider we can send and receive faxes, via mail or on a machine connected to a gateway.

We test with SPA 3102 without problems.

Regards.
Alejandro Esteve
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Re: use 3cx with fax or service

Postby farsight » Sun Nov 06, 2011 2:03 am

I have a customer with a PRI with DIDs. We route one DID through 3CX to a Grandstream HT503. It was a little odd to setup but works with both incoming and outgoing.

I don't know that it's recommended but it works.

Using a VoIP would be very different.
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Re: use 3cx with fax or service

Postby eagle2 » Sun Nov 06, 2011 9:24 am

It depends what you want and what you expect. Generally any ATA supporting G.711a/µ will and fax passthrough will be able to receive / send fax, probably with up to 50% success rate, depending on provider, etc.

Speaking about T.38 fax (or FoIP) is different story, again depending on adapter and on provider. For reliable faxing (up to 100% success rate) you must stick to T.38

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Re: use 3cx with fax or service

Postby sigma1 » Sat Nov 19, 2011 1:51 am

I am sorry for the delay in getting back to you, I just saw this.

The GXW4004, 4008 and 4024 works perfectly wine with most SIP trunk providers (711 or T38). Don't waste your time with NexVortex. Call Gafachi and you are all set, if you want to receive faxes via 3CX, ask for Dave Campbell, TELL HIM that I sent you there and that you need the special 3CX config we developed. Don't forget to edit the 3CX fax config files.
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