On-Premise Phone Systems Melbourne
Phone systems built for businesses that simply can’t afford downtime
Some organisations can’t rely solely on the cloud — and shouldn’t have to.
When phones are business-critical, on-premise systems remain the most dependable option.
Internal calls, transfers and extensions keep working even if the internet drops out. Your control, security and uptime stay on site.
Prosum designs, installs and supports business-grade PBX and telephony platforms for teams that need their communications to just work — every day.
Melbourne-Based Engineers
National Coverage
25+ Years Experience
When On-Premises PBX Phone Systems Make Sense
On-site systems aren’t about bells and whistles. They’re about reducing risk and keeping your business running.
They’re ideal when you need:
- Internal communications during internet or WAN outages
- Consistent call quality
- Full control over security and sensitive data
- Reliable site survivability during disruptions
- Seamless integration with your existing infrastructure
Hospitals, contact centres, multi-site operations and 24/7 teams trust on-premise systems because downtime simply isn’t an option.
If your phones go down, your business stops — on-premises is the safer choice.
Designed by Engineers. Supported by Humans.
We’re not a reseller pushing boxes. We’re engineers who design PBX phone systems properly, install them cleanly, and stick around to support them long term. That means:
- Thoughtful system design from day one
- Smooth cutovers with minimal disruption
- Integration with your network and security stack
- Direct access to experienced local engineers
- Ongoing support and lifecycle planning
No ticket ping-pong. No offshore help desks. No blame game.
You call us — we fix it.
Alcatel On-Premises Phone Systems
Modern, reliable business telephony — installed and supported properly
Deploy a proven Alcatel on-site phone system built for reliability, control and long-term stability.
Ideal for organisations that want dependable communications without relying entirely on cloud services.
Engineered for uptime. Supported locally. Built to last.
NEC Phone Systems Support
Keep your existing system running smoothly
Already have NEC?
We no longer sell new NEC systems — but we specialise in keeping them operational, stable and supported.
Maintenance, upgrades and modernisation planning — so you can improve on your timeline, not during a crisis.
Maintain first. Replace strategically.
Why Businesses Choose Prosum
25+ years of communications engineering experience
Hundreds of complex, enterprise deployments
Melbourne-based with national coverage
Specialists in hospitals, contact centres, & critical operations
Direct access to senior engineers
Engineering-first, not sales-driven
We don’t just sell phone systems. We protect business continuity.
Speak With an Engineer
What our customers say about us
I’m very glad and fortunate that I had PROSUM looking after my IT and CCTV. They are trust worthy, reliable and very easy to work with.
Mina Zacharia,
MANAGER | ASTRO MEDICAL IMAGING
Very good and prompt service. Friendly staff.
Paul Bhatti,
WATSONIA VETERINARY CLINIC
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
