SIP Trunks

Upgrade Your On-Site Phone System with Prosum's SIP Trunks

Enhance your on-site communication with Prosum’s SIP Trunks. Bid farewell to the complexities of line rentals, enjoy budget-friendly call rates, and embrace seamless business communication. Explore the benefits of Prosum’s SIP Trunk plans today.

Why Prosum For SIP Trunks?

100 +

Years of combined IT and telco experience

1500 +

Happy customers, and the numbers keep growing

100 %

Friendly support from our local Australian team

96 %

Customers have been with us for 5+ years

Experience the Benefits of SIP Trunking with Prosum

No More Line Fees

Tired of hefty line rental fees? SIP trunking cuts costs for calls without sacrificing quality.

Grow with Ease

Our SIP trunks fit any business size effortlessly. Expand your phone system hassle-free without pricey upgrades.

Upgrade Without Hassel

Keep your PBX phone system. Enhance communication without a complete overhaul.

Compatibility Check

Not sure if your system is SIP Trunk-ready? Call us for a smooth transition with no worries.

No-Nonsense Billing

Simplify with our clear, monthly costs. No confusing bills or surprises.

Help at Your Fingertips

Questions or need help? Call us. Let's discuss how SIP trunking can boost your business communication with ease.

SIP Trunk Plans


Make every call count without breaking the bank.
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There are no hidden fees, just crystal-clear communication on your terms.


What’s included:

  • Pay as you go for all your monthly calls in Australia.
  • Low call rates with per-second billing.
  • No lock-in contracts.
  • Cancel your plan anytime.
  • 24/7 local Australian support.


Optional add-ons for your tailored communication experience:

  • DID Numbers
  • Number Porting


Nevery worry about call limits again.
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Enjoy unlimited communication without overage worries.


What’s included:

  • Predictable monthly payment plan.
  • Unlimited calls to local, national, and mobile within Australia.
  • No lock-in contracts.
  • Cancel your plan anytime.
  • 24/7 local Australian support.


Optional add-ons for your tailored communication experience:

  • DID Numbers
  • Number Porting

Ready to find your perfect SIP Trunk plan? Talk to us about our unbeatable pricing options.

Client Testimonials

What our clients 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,


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,


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,


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,


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

Not sure if your PBX phone system will work with our SIP Trunk service?

Contact our team; we’re happy to check for you.

SIP Trunking FAQs

We are not a volume business that needs to capture continuous sales. We pride our business on providing our customers with the best value technology and support.
Rest assured, Prosum's SIP trunks seamlessly integrate with a variety of IP-PBX systems. Don't hesitate to get in touch with us – we'd be delighted to check for you.
Choose Prosum for a seamless communication experience tailored to your needs. If you're familiar with an on-prem PBX, stick with it. Our cost-effective SIP guarantees a better ROI, outperforming legacy ISDN rates. Easily connect to on-premises UC and modern PABX systems, or utilize gateways for older PABX models. Beyond the technology, our commitment sets us apart – we're a small business that prioritizes your success. Unlike larger carriers, we offer cost-effectiveness, superior support, and a genuine desire for the very best for your business.
The easiest and quickest way to get support is emailing our support team at If it’s urgent please call (03) 9697 2222. Our help desk is staffed Monday to Friday 9am to 5pm with on call technicians all other times.

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Talk to us today about how Prosum can help you with all your business tech and communication solutions.