title: how to make call from pc using local landline phone services
body: <p>I have a desktop application of address diary, developed in C# .Net.</p>
  
  <p>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.</p>
  
  <p>how to connect phone lines to pc. i have more then 8 phone lines </p>
  
  <p>is it possible ? if yes then how and which hardware i need for this.</p>