“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.
Bisatel terminaison voip sip iax.
bisatel callshop, call center.
Distribution de minutes voip à prix ultra discount.
Bisatel switch, solution de gestion de services voip pour clients.