Which type of landline is right for you?

We understand that you don’t have the time (or interest) in learning all about landlines, so we’re going to try to make understanding the difference between PSTN and ISDN as easy and painless as possible.

There are two types of landlines available: PSTN and ISDN. And Alltel can help you with both (or either).

A typical business often requires an ISDN service for employee phones, plus one or two PSTN lines for dedicated services such as EFTPOS machines and security systems.

PSTN (Public Switched Telephone Network)

PSTN provides a single phone number and a single phone line. (That is what most of us have at home.) A PSTN service is ideal for smaller businesses that require one or two lines. It is also recommended for any service where a dedicated line is required, such as fax and EFTPOS machines, back to base alarm systems, and ADSL connections.

ISDN (Integrated Services Digital Network)

This is a digital service that enables multiple simultaneous phone calls on shared phone lines. It is ideal for businesses with 5 or more employees.

In most businesses, it’s common for only 30% of phone lines to be in use at any one time. That means that in an office with 30 people, you need either 30 PSTN lines or only 10 ISDN lines. With ISDN, everyone can still have a unique phone number, plus it’s easy to add more lines as your business grows. You make and receive calls in the usual way, and the network works out all of the line sharing for you.