In the MsComm thing, there is an event that happens when the modem rings. In most modems, there is also a ring count register (S1).

When you get the comEvRing event, just look at the ring counter in the modem if you wanna have it ring a couple times first, or just pick it up there.

Look up AT modem commands to control the modem. It's easy. (ATH1 brings the phone off the hook).
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Written using the Dvorak keyboard layout.