SIP Trunks

Unlock effortless connectivity with Prosum's SIP Trunks

Wave goodbye to line rental hassles and embrace seamless business communication. Explore Prosum’s SIP Trunking solutions 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

From cutting costs to seamless expansion – embrace hassle-free business communication.

Ditch Line Rental Fees

Fed up with those chunky monthly line rental fees? SIP trunking slashes traditional costs, offering reduced rates for local and long-distance calls. Enjoy savings without sacrificing call quality—thanks to our top-notch VoIP-enabled calls.

Grow Effortlessly

Prosum's SIP trunks are like the perfect fit – designed for businesses of all sizes. Whether you're hiring new talent or expanding, scalability is a walk in the park. No need for pricey upgrades – just expand your phone system hassle-free.

Upgrade Without Overhaul

Change is great, but sometimes you want to stick to what clicks. With SIP trunking, keep your trusty PBX phone system. No need for a complete revamp – just amp up your communication game without turning things upside down.

Compatibility Check

Not sure if your PBX phone system is SIP Trunk-ready? Dial us at 1800 007 229, and we'll sort it out for you. Our aim? A silky smooth transition, so you can dive into the perks of SIP trunking worry-free.

No-Nonsense Billing

Embrace the easy life with Prosum's flexible calling plans. Say adieu to confusing bills and surprise charges. Our clear, monthly costs keep you in the driver's seat of your communication expenses.

Help at Your Fingertips

We're all about A-grade support. Got questions or need help? Just give us a call. Let's chat about how SIP trunking can revamp your business communication, keeping it all smooth sailing.

SIP Trunk Plans


Make every call count without breaking the bank.
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Why choose PAYG SIP Trunks?

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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Why choose UNLIMITED SIP Trunks?

Enjoy the freedom of endless communication without the stress of overage charges.


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.

*Number porting is subject to your existing carrier’s number porting arrangement.

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.
Many customers choose us because they are treated poorly by larger carriers. As a small business we are more cost effective, provide better support and genuinely want 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 0396972222. Our help desk is staffed Monday to Friday 9am to 5pm with on call technicians all other times.

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Client Testimonials

What our clients say about us

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 what internet service is available at your business address?

Connect with one of our internet specialists for a free consultation, and we’ll match the best technology available in your area.

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