When you choose us, you get expert advice, a smooth setup, and long-term support — no overseas call centres, no generic fixes.
On-Premise PBX Phone Systems For Your Business
Simple, Secure, and Tailored Phone Solutions
Your business needs a phone system that works every time—no hassles, no interruptions. Whether you’re upgrading or starting fresh, our on-premises systems make communication easy and reliable. We’ll get you up and running without the tech headaches.
Why Choose an On-Premises Phone System?
Enjoy More Control, Rock-Solid Reliability, and Built-In Security
An on-premises system is installed directly at your business, giving you full control over how it runs. Unlike cloud-based solutions, it doesn’t rely on your internet connection — so even if your Wi-Fi goes down, your phones keep working.
- Ideal for offices, warehouses, medical clinics, legal practices, and more.
The benefits of on-premises PBX systems
More Control
Tailor the system to suit your team, workflows, and customer experience.
Highly Reliable
No internet dependency means fewer disruptions and more uptime.
Secure by Design
Keep your data and call traffic in-house — under your roof and in your hands.
Need a hand choosing the right setup?
Our Trusted Phone Systems
NEC
See our NEC phone system solutions ideal for small to medium businesses.
- Easy to use.
- Reliable.
- Cost-Effective.
Alcatel Lucent
See our Alcatel-Lucent phone systems perfect for small, medium and large businesses.
- Advanced features.
- Highly scalable.
Scalable, Proven, and Built for Business
We supply and support two of the most trusted names in on-premises phone systems — NEC and Alcatel-Lucent. Key features you’ll love:
- Multi-line & extension support
- Call routing and auto-attendant options
- Voicemail to email functionality
- Built-in conferencing features
- Seamless integration with your network
- Scalable for future growth
Want to see it in action?
Support You Can Count On
Custom Support Plans
Tailored to your needs, your system, and your budget.
On-Demand IT Support
Prefer to manage things in-house? We’re here when you need backup.
What our customers say about us
I recently had a new VC installed from the team at Prosum. David Colletta and his team were not only professional with the installation, but at all times, the communication was second to none from them to see at each step where we were at. The installers were brilliant, and to top it off, they cleaned after the installation leaving us nothing to do. How refreshing this was. Again, I cannot speak highly enough of the team at Prosum; their professionalism was second to none, and their on-time approach was exactly that on time! Please do yourself a favour and get the team out there to look at what your needs are for the business, big or small. They have it all! Well done and thank you.
Yolanda Di Ludovico,
FIRST SUPER
We needed an experienced ICT VoIP provider that could implement a new telephony solution without affecting existing telephony services and business operations. After reviewing other providers, we selected PROSUM who was able to successfully migrate all our users onto the new NEC platform and complete the project in a timely manner. PROSUM continue to provide support for our NEC Telephony and Contact Centre environment and I would recommend their services to other organisations and enterprises.
Andrew Trinh,
ICT INFRASTRUCTURE & SERVICE DELIVERY MANAGER - VICTORIAN CYTOLOGY SERVICE LIMITED
We are constantly looking to continuously improve the way we do business and service our customers and distributors within our customer service operations. This is why we selected PROSUM as our telephony and contact centre provider. Their experience means we have a VoIP provider we can rely on to provide and maintain our telephony and contact centre environment.
Therese Chakour-West,
INFORMATION TECHNOLOGY MANAGER - STIHL
Aitken Real Estate had to move office and sought David Colletta of Prosum advice about switching our telephony to the cloud. Extremely helpful, no-nonsense information and can get the job done. Their tech Antoine was sensational. No delays, no problems. Highly recommend!
Stephen Aitken,
AITKEN REAL ESTATE
Thanks to the PROSUM team for the successful migration of the Brisbane phone system. A great deal of planning and hard work in the preparation resulted in a smooth migration with zero downtime to the business – a reflection on the dedication and preparedness to the project. Thank you.
Raphael Cheah,
Network Administrator - AECOM
A Smart Investment in Your Business
Choosing an on-premises phone system means better performance now — and long-term savings down the track.
- Peace of Mind: Stay connected, even when your internet isn’t.
- Better Security: Keep sensitive communications private.
- Cost-Effective: Save on ongoing fees with a once-off investment.
Curious how an on-premises system could work for your business?
Why Choose Prosum
Expert Guidance
We tailor solutions to fit your business.
Australian-Owned & Operated
Local knowledge, nationwide service.
Real Support, No Call Centres
Speak to experts who know your business.
End-to-End Service
From consultation to installation and ongoing support.
Competitive Pricing
Direct vendor partnerships mean better deals for you.
