TAPI Newbie Struggles, Is TeleTools 3.7 a good buy?

Hello everyone. I have been scouring the net for the last couples of
weeks for TAPI info and it has been hard getting a grasp of things as
it seems like this concept has "died off" of popularity from
development. A lot of the links (Helen Warn's Wrapper, eg) are broken
and most of the source codes have been removed. I did find Andrea's
site and I'm graciously looking over it.

All I need to do is perform a basic dial out (and hang up in ~5
seconds), and retrieve the CallerID information from an incoming call;
I'm using C# to develop. I will always be working with the same modem
and it is known. Because I can't seem to find any guidance for even
performing these two basic operations, I was debating purchasing
ExceleTel TeleTools 3.7 express edition with the TeleScope as well. Is
this a capable development package or am I better off somewhere else?

Any input is greatly appreciated, so thanks in advance.
.