Hi EveryOne! I know very well that this is not the right group to ask BUT there is now way, yeah I have been searching and searching since last week to locate any appropriate useNet , E-Forum or mailing list , but no luck so far;-) We are working for general solution like call center , voice conference , call diverting-forwarding-recording etc on windows platform. I'll appreciate any useful tips and hints for this from design to implementation phase. I need to know if any one here can help me interfacing the Hardware Switch CSP 2000 [ [URL]http://www.excelswitching.com/ProductCSP2090.asp[/URL] ] for implementing SS7 [[URL]http://www.pt.com/tutorials/ss7/index.html[/URL] ] protocol. SDK shipped with hardware switch provides high level interface of hardware switch with C/C++ syntax. But the issue is lack of proper documentation , documents given with switchKit is neither sufficient and nor detailed. Any www , usenet group and article will be appreciated. And let me know if anyone here familiar with SimpleTandem sample code which is shiped with SwitchKit. I expect some development related pointers;-) -ali