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Telephone exchanges / Telephone switchboard / Automated attendant / Voice-mail / Telephone number / Voice over IP / Metadirectory / Rotary dial / Telephone / Telephony / Technology / Electronic engineering
Date: 2013-04-04 06:52:10
Telephone exchanges
Telephone switchboard
Automated attendant
Voice-mail
Telephone number
Voice over IP
Metadirectory
Rotary dial
Telephone
Telephony
Technology
Electronic engineering

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