SIP and ISDN: The future of your business

Ensure you are prepared for the ISDN shutdown

September 2019 – that’s when Australian ISDN networks begin shutting down.

If you don’t plan for the switch, your phone services could be completely cut off. It doesn’t need to be said how much of a disruption that would be to your business.

Which means you need to plan ahead. Thankfully, there are plenty of reasons to switch from ISDN to SIP technology. They’re more flexible, more redundant and usually cheaper overall. But not every provider is equal.

Let’s show you how to make the most of your switch to SIP.

The Difference between SIP and ISDN

  • ISDN stands for Integrated Services for Digital Network. It’s essentially the older technology used via phone networks.
  • SIP or Session Initiation Protocol is the newer service, and it’s essentially the technology used to deliver Voice over IP Services.

ISDN is an older technology and due to the rollout of the nbn™, it is being decommissioned.

But choosing a SIP service isn’t just as easy as picking a provider. There are plenty of reasons why you should think carefully when you need to switch over your service.

Key reasons why SIP is better than ISDN


Crystal clear call quality

You might hear people say that VoIP call quality isn’t as good as ISDN. Fortunately, that’s just a myth.

It is absolutely true that call quality is affected by the Internet service that you have. But assuming you have a quality service installed and maintained by a provider that specialises in supporting business networks, then you call quality should be just as good or better than ISDN lines.

This is also why you need to work with a provider that securely controls VoIP traffic, giving it the highest priority as opposed to say, data downloads over your network. That means no matter what, your VoIP calls are getting the bandwidth they need – and your call quality will remain crystal clear.

Ability to scale

Unlike traditional ISDN lines, which are sold and distributed in packages, VoIP lines are easily added to your business.

That’s because all VoIP services need are your internet connection. As long as you have a secure, steady and bandwidth-rich connection, then adding new VoIP services is a piece of cake. You never have to worry about technology scaling as you grow.

Enough redundancy to protect your network

One of the problems with ISDN networks is that if your infrastructure goes down, no calls can come through at all. Everything is built into the one system – and damage to physical networks means you’re stuck.

With SIP and VoIP technology, you can use different pieces of hardware in different combinations, meaning your network is never at the mercy of a single point of failure.

A proper provider will assess your needs and build this into your system from the beginning.

Not only that, but VoIP services are far more flexible

When you buy an ISDN service, you get a phone number that’s attached to a particular location.

With VoIP services you still get a phone number – but you don’t need to get a new phone number for every service that you add.

Not only that, but you can direct that phone number regardless of location. So you can have calls distributed across multiple locations – even from the road.

That means whenever you need to adjust business resources or operate your business in flexible ways during busy periods, VoIP helps you – instead of holding you back.

This is also why it’s important to choose a VoIP provider that can guide you through the process of setting up these systems, so you get the most out of them.

Plus, VoIP probably works with your current tech

Most businesses with a PBX system will find they’re already compatible with SIP and VoIP technology, though you can easily add a gateway on-site.

There’s no need to run out and buy an expensive new phone system when your current model will probably work fine.

You’ll be surprised at the price

Every business is unique, but combining data and VoIP packages means you often get better value for money. Plus, you no longer need to pay for the privilege of maintaining and access two separate systems across two separate pieces of technology.


Download our eBook, 6 Key Reasons Why SIP is better than ISDN now.

Simon Utting
by Simon Utting
Communications you can trust.
Enabling business transformation through effective communications.