Your Wish:

"Get something to answer if my maintenance modems don't"

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.

RRU Remote Reset Unit

Resets a remote PC over dial connections using a dedicated or a shared telephone line.

MODEM SELECTOR SWITCH (2C)

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