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Exchange user services (examples)
nAbsent-subscriber services as the answering machine
nCall booking: connection at the desired
time
nPerson-to-person call: ensures that call goes
to a right
person
nSerial call: setting up several calls
nTelephone conferencing: several persons participate to
call in real-time (compare: tele-conferencing)
nDirectory inquiries:
also speech recognition, recorded messages
(many of these nowadays available in terminals)
(many of these nowadays available in terminals)