Request for supplementary services:
They allow you to enjoy additional services on your phone line. They are available only to subscribers of digital exchanges.
CALLS IDENTIFIER: It is the service that facilitates you to know the telephone number of where they call you.
CALL WAITING IDENTIFIER: Allows you to identify the other call waiting to be answered.
SHORT NUMBER (NB): Allows you to program a two-digit code on your phone to quickly dial a frequently used telephone number.