“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.
Build or grow your VoIP company in hours. Hablaporinternet will provide you all the hardware, software and professional services to put in production a high voice quality service.