I would like to set up a fax server. The problem is that there must be a user friendly gui client that would allow bulk faxing. Any suggestions? Any other solutions maybe?

Hylafax is pretty much the 'standard' Linux fax solution. There are MANY GUI based clients for it.

However, the term 'bulk faxing' makes me not want to point you to any, since I get enough spam as it is now, and that's just a bit suspicious (sorry). Google can point you to things.

I use Hylafax for several years (CentOS release 5) and it's very powerful. The Front End system allows users to create fax requests which placed into Queue (ORACLE TABLE). My program process this queue and generates PDF files which are sent by Hylafax. Generally the system process tens and hudreds faxes daily. I also keep track of what was sent and what was failed and update proper ORACLE tables, so the front end users can get almost "real time" feedback regarding the request status.

If you need more info you can contact me.

This has nothing to do with spam. It has to do with an industry that wants to inform their clients (also industries) for product updates etc. You may not believe it but almost half of the clients dont have an email adress or they think that emails are not a reliable method!!!

Ok. Lets say that i set up a Hylafax server. My first option is to connect the server with a fax machine. Can i do the same thing with an internal fax/modem? Which method is more reliable? Are there any other options provided by hylafax?

Look at http://www.hylafax.org/content/Hardw...atibility_List to see the list of supported modems.
We are using MT5634ZBA-V.92-NAM internal modem card with 4 ports. We tested it on CentOS/RedHat 5. If the hardware is supported by OS you will see the following device files:

crw------- 1 uucp uucp 4, 64 Nov 22 09:39 /dev/ttyS0
crw------- 1 uucp uucp 4, 65 Nov 22 09:42 /dev/ttyS1
crw------- 1 uucp uucp 4, 66 Nov 22 09:35 /dev/ttyS2
crw-rw---- 1 root uucp 4, 67 Nov 6 15:00 /dev/ttyS3

Then you can go ahead and install the Hylafax. The part of the installation is the setup of each port where you assign the phone number. See Hylafax installation manual for details.

I absolutely do believe it....and I also believe that my fax machine has pages on it almost every morning, of crap that I don't want. Ads for travel agencies, carpet cleaning, etc.

I'm not doubting what you say, but I can't KNOW that you're only going to use it for contact with existing clients, and not to blanket-fax ads to people. Hylafax does work with internal fax modems...their website can tell you which ones, and how to set it up.

I would recommend a T.38 Solution ICTFAX, http://www.ictfax.org .rather than old IAX Modem technology

If someone knows the advantage of IAX Modem technology over T.38 / G.711 based FOIP Solution, please share

Regards