“Extension” - is the extension of the telephone line (PBX) or the Centrex system. It works as an association and allows calling to certain telephone sets without the necessity of dialing the telephone number, but only by dialing a short combination of digits, reaching the desired subscriber.
Trisun Communications Corporation
Trisun Communications is a leading international carrier and provider of wholesale services to carriers and resellers throughout the world. Our network bridges the horizons between traditional circuit based communications to the next generation `Voice ove
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