ISPhone are the ones to turn to for complete communication solutions. They specialise in IP telephony, fixed lines, mobile, and data services, along with a range of other communication services that will get your business operating more effectively.
“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.