The connection-oriented service process for networking is same to the manner in which telephones are used. This is shown as follows:

A caller dials a number of the receiver. The telephone at the receiver end signals the arrival of a connection request. If the called person does not accept; the caller provides up after waiting for a timeout. If the called person does accept, then the connection is created.

In data communication, as binary number identifier is known to each of the two parties to active identification of the connection.