WHAT IS ISDN?

ISDN stands for Integrated Services Digital Network. ISDN is the basic standard in digital communication and is used by telecom operators to offer different services.

There are two different standards for ISDN lines. ISDN BRI (BRA) is generally used in home and small office applications while ISDN PRI (PRA) is preferred by corporate companies.

The main difference between analog telephones used in homes and ISDN is the following. In analog telephones, telephone information is carried digitally between exchanges, converted to analog signal at the exchange closest to your home and transmitted as an analog signal to your home phone.

In an ISDN system, the information is carried digitally to the end user and converted by the user’s telephone machine or switchboard into an analog signal that our ears can understand. There are two advantages to the digital transmission of information. First, digital information is less affected by noise, so the sound quality is high. Secondly, since the information arrives at the end point digitally, different applications (image internet etc.) can be run on it.

ISDN BRI has lost its popularity with the spread of ADSL, but PRI lines are still widely used.

WHY USE ISDN PRI?

In ISDN PRI signaling, 30 people can make phone calls on a single PRI channel. Maintenance is easier as 30 channels are carried over a single line.
Thanks to the DID feature, users can be accessed directly. Since each personnel can be given a direct number, the need for telephone operators will decrease and this reduces the personnel costs of companies.
Provides infrastructure for unified messaging applications.