Make Telephone Phone Call from ASP.Net Application

Hi,

I have sql server database in which I have lot of contact person and their telephone numbers. these contact numbers is viewed by user on asp.net form in gridview control, its working fine. User filter the numbers dial the numbers to client through telephone set.

Now I am thinking to merge the call dial and receive funcationality through asp.net form like user have asp.net form have some telephone dial up control, search the number and dial the call on button click event. To talk with client user has headphone.

Please guide how can i do it.

Thanks in advance