What is ISDN?
ISDN is a business-only digital line (delivered in multiples of two lines or in a 30-line option), which interconnects a traditional phone system (PBX) to the phone network, improving clarity and quality of calls. Before ISDN, it was not possible for ordinary telephone lines to provide fast transportation over a single line.
Benefits of an ISDN line
The basic advantage of ISDN is to facilitate the user with multiple digital channels, which can work simultaneously. ISDN network lines are able to switch multiple devices on the single line such as faxes, computers, cash registers, credit cards readers. All these devices can work together and directly be connected to a single line.
However, while ISDN is very resilient, it has some limitations in terms of portability and flexibility.