Dial out from a mode.

I need to use vb .net 2005 to create a software that will dial out a phone number, can some one help me out where I can find some information about it? And if there is any good book about that.

Thank you.

ps. The application will dial a number, say a msg and the user will need to press 1 to confirm.

But since I never did anything like this before, I'm going by section, first try to get the modem to dial, than to say something, and latter to get the response back.