PBX Systems

Our on-premise PBX systems are best-suited to businesses with many staff who each need a phone handset to make and receive calls, but don’t always use the phone.

In this situation, a business may require 20 handsets, but only 3 or 4 phone lines for concurrent use. Although there is an initial cost to install an on-premise system, significant cost savings are made over time by not paying for licences for 20 different lines.

Unlike a cloud-based system, an on-premise PBX system is installed in your IT room. Our IP communication systems are ideal for your move to the NBN, and accommodate future business growth and new technologies as they emerge.

Key features of our on-premise phone systems include:
● Unified communications are supported
● Hybrid system supporting digital and SIP trunks
● NBN-ready
● Mobile integrations and apps at each extension – desktop and mobile
● IP-based handsets – digital, cordless, SIP, doorbells
● Auto attendant and IVR

Our most popular systems

Panasonic KX-NS700

Our biggest seller for smart hybrid PBX systems, the Panasonic KX-NS700 is the best choice for small to medium-sized businesses with 1 to 30 phone lines and up to 250 internal extensions in a single site.

  • Smart hybrid PBX system for small and medium-sized businesses
  • Expand from 6 extensions, up to 288 extensions with Expansion Units
  • Cost-effective installation and operation
  • Built-in applications include call centre solution, mobile solution and voicemail

Panasonic KX-NS1000

Best suited for up to 8,000 users, the KX-NS1000’s modular architecture can be tailored to suit your business needs – whether for a small office with 2 people, or a large organisation with several locations.

  • IP and SIP network communication server.
  • Integrated unified messaging with up to 24 ports per unit
  • Build systems for up to 8,000 users
  • Reliable backup system to survive system failures
  • Call centre solution with voice guidance for customers

Our most popular handsets

Standard IP phone


  • 3-line display with backlighting (KX-NT543)
  • Plantronics wireless headset (EHS)-compatible
  • 24 freely programmable function keys
  • 2 Ethernet ports (100 Base-T)
  • Power-over-Ethernet (PoE)
  • Eco mode


Business communication at your fingertips


  • Up to 4 SIP accounts
  • 4.3” colour TFT LCD touch panel
  • Built-in Bluetooth®
  • 24 flexible function keys with optional
    expansion to up to 224 keys
  • Full duplex speakerphone
  • HD sound with wideband audio
  • BroadSoft UC-One/uaCSTA

The Cloud PBX system that Comsource supplied when we moved to NBN has worked seamlessly and saved us some 30% a month on costs

Alex, IT Manager, Brunswick

Moving to Comsource has made our lives easier. We deal with our Account Manager directly and all our issues get resolved on the same day

Dr. Wayne, Family Doctor, Hervey Bay

Comsource really understands our business needs. We had an urgent fault and they even managed to send a technician on a Saturday

Dr. Julie, Vet, Port Melbourne

I just like speaking to the same person every time I call - and consolidating our different phone, mobile and Internet into one account just made sense

Marti, Business Manager, South Melbourne

We’ve dealt with the same guy for 4 years, they understand our day to day needs and are always very prompt in helping us out

Nikki, Practice Manager, Glen Iris

Phones are a critical part of our interface with clients and we wouldn’t entrust this to anybody else

Kathryn, Architect, Brighton

We love to talk and our team is here to help!