Modern VoIP Features Explained – CTI

A standard telephone or a PSTN telephone works through a telephone exchange that is housed in a telephone company premise. From there, the company provides a link to your phone device, in most cases through a single cable per device. If you had ten phone lines, there would be ten cable pairs from the phone company to your office. As companies grew, they would install an EPBAX within the office that would give intercom capabilities, and direct dialling from each extension. But, at the other end, you still had 10 lines connecting you to the phone company. These lines were called trunk lines. Even if you had 100 extensions within office, your connection to the outside world was through those trunk lines. Continue reading...