>thanks for advice.
>
>can i use TAPI in this case?
>it's only a small app where i need this and therefore i don't want to buy a third-party product.

TAPI would address the dialing problem, but it has no concept of file transfer or low-level port manipulation. MSCOMMis actually better suited to the task because there is at least a stream concept implementable with low-level comms.