Phonelinesoftware

Hi, I am trying to use ModemTest to test two Notebooks using the master 
and slave configuration.
Both notebooks connected to Analog phone lines, dialing one another.
I would like to do this without using Phone lines. Can you recommend a 
phone Line Simulator product? Or are you aware of any Phone Line 
Simulator that works with your software? I know they are expensive.

The Modems I am trying to test are :
Motorola SM56 data Fax Modem (ModemTest Loopback test not working)
Connexant HDAUDIO Soft data Fax Modem with SmartCP(Loopback test works)

Thanks