(or cellular phone) function properly? I know there are at least a few
* The scanner must be tuned to the cordless phone being called.
* The owner of the cordless phone must be a Caller ID service subscriber.
* The Caller ID decoder on the cordless phone base transmitter must not
filter out the Caller ID signals or codes.
* The base transmitter must send the ring signal to the phone handset by
radio. I think all handsets do get their ring through the air as opposed
to an electrical connection when resting on the base/charger. (I am
assuming that the Caller ID is embedded in the ring or sent inaudibly
immediately after the ring.)
Of course, nobody in the United States should do this -- unless they
switch to another frequency right before conversation begins. Or is
monitoring ring signals prohibited as well? :-)