Farhat - 2006-02-08

Hi everyone, I want to develop an application which aims to receive voice on PC from telephone. When I compile Outcall or JSoftPhone I get the error of "Can't get provider".
I have gone through every msg on forum to find out the solution but no use. I hv placed everything on the right place.
I hv also checked tht I own a voice modem.
I want to know in which situations this error comes and also is there any server needed to run telephony application ?
Plz help as soon as possible