Calling from landline using c#.net

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C#

I want to make call from software throw land line phone service, in my office we have 8 phone lines, so i want to select line before call, i want to use headphone and mic in place of phone instrument.

how to connect phone lines to pc. i have more then 8 phone lines

is it possible ? if yes then how and which hardware i need for this.


Thank u..