Call waiting with “Caller ID” uses a special signal in
order to warn you about an incoming call, during another call there are shown the
name and number of the calling subscriber on the display. The function also
allows switching between two calls.
A feature allowing sending calls to queues or extensions based on set criteria. In example, a skill based routing where calls are directed to an agent or person, who has the most appropriate skill set in order to address the problem.