central
telephone exchange
exchange ***

You are on the local telephone exchange, is that right?

The telephone exchange was asked not to accept press calls.

James suggests him to take the help of a telephone exchange to find from where the calls are coming.

A telephone exchange was opened there on 3 June 1913.

The pair in many cases goes through the local telephone exchange.

Maybe a telephone exchange or some kind of social identification.

The reason he hadn't was simple: the man had more leads than a telephone exchange!

The telephone exchange was handling up to 2.5 million calls in 1918.

In March 1913 the town's first telephone exchange was installed here.

This action can signal the telephone exchange to do something.