An operator of a switchboard is a telephonist.

Yes a virtual phone service can eliminate a need for a switchboard operator, though make sure that the virtual service offers everything, that a switchboard operator would.

The switchboard operator placed the call for the angry executive. All of the messages were taken at the switchboard.

A hotel switchboard operator is a person who answers call that come into the hotel. They the re-route the call to the department or room that the caller requests.

the purpose of a switch board is a connection for