Free or Open Source Telephone Software

Anyone know of a good free or open source Telephone Software? I mean something that you can make voice calls on your computer through your modem? I am not looking for a phone service, just a way to use the computer as a telephone. My client had an older computer which came with such software. She bought a new one and it doesn't come with such software.
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smetterdAuthor Commented:
To make an actual local telephone call using skype costs money. I am looking for a free one.
Windows Phone Diler is a built-in application you can use to make phone calls and it amazes me how people use to forget that they can use  their computers as telephones.
I remember six-seven years ago Gateway computers use to come with BVRP Megaphone - phone tools but the application has never been free I think.  BVRP still has probably the best of the breea phone tools.
No wonder its tools are approx $80 :
Then some modern modems use to coem with Communicate telephony tools

My favourite is Willowpond  WillowPhone unlimitted free PC to phone dialer.  Remember their Media-Rack player which was default install on many Hewlett-Packard computers back in Windows 9x era ? I'M NOT SURE WHETHER IT'S COMPATIBLE WITH WINDOWS XP AND MOST RECENT SOFTWARE MODEMS THOUGH !
WillowPHONE WEB page is still there more like and sing of past times and cannot be downloaded fromthere .Fortunately PC WORLD magazine has an archived file here:

some other considerations:
PalTalk :

good luck

good luck


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