ISDN: What It Is And How It Works

ISDN: What It Is And How It Works

An introduction to ISDN, the ISDN switch-off, and your options for switching to VoIP or SIP. What is ISDN? ISDN stands for Integrated Services Digital Network. It’s a set of communication standards that uses digital transmission to make phone calls, video calls,...
VoIP Phone Systems: A Buyer’s Guide

VoIP Phone Systems: A Buyer’s Guide

VoIP simply stands for Voice Over Internet Protocol and means the use of the internet for telephony. It’s the basis of many modern phone systems and allows voice calls through well known apps and services. At Gradwell, we’ve had almost 20 years of experience in...