Your Wish:

"Power on my PC remotely and have it dial me back"

K-RRC Key-Based Remote Reboot Controller

Control AC Power or press the reset button on remote equipment out-of-band, over ordinary telephone lines. Other calls pass through transparently.

SP-RRC Single Port Remote ReBoot Controller

Remote control of a single port (AC power or reset button reboots) over a shared dial line.

MODEM SELECTOR SWITCH (2C)

Caller can select either of two alternate modems on the same line securely.