A dialer (US) or dialler (UK)
is an electronic device that is connected to
atelephoneline to monitor the dialed
numbers and alter them to seamlessly provide services that
otherwise require lengthy access codes to be dialed. A dialer
automatically inserts and modifies the numbers depending on the
time of day, country or area code dialed, allowing the user to
subscribe to the service providers who offer the best rates. For
example, a dialer could be programmed to use one service provider
for international calls and another for cellular calls. This
process is known as prefix insertion orleast cost
routing. A line powered dialer does not need any
external power but instead takes the power it needs from the
telephone line.
