ZUUL (The Gatekeeper) is intended to operate on a
stack of modems. When an IP packet arrives and the
target is known by the phone table, it connects
one of the modems to the resolved phone number.
This is done by pppd and chat. ZUUL leaves most of
the configuration with the used programs. It is
partly based on diald, and is especially
interesting for people who need to call a large
number of stations (with different phone numbers)
over a modem.