Sip Trunks

Prosum’s SIP Trunks are a cost-effective way to connect your business to the PSTN (Public Switched Telephone Network).


    Fill out our online form or call us on 1800 007 229 to find out more about Prosum's SIP Trunks for your business communication needs.

Your smartest business choice is to save money when you switch to Prosum SIP trunks for your business communication needs.

Prosum SIP trunks are high quality, reliable telephone lines that replace traditional PSTN/ISDN telephone lines reducing line rental fees and call charges, saving you a fortune in ongoing costs.

They integrate seamlessly with a wide range of PBX systems and are easily scalable, so they grow along with your business.

Sip trunks

Benefits of Prosum SIP Trunks for your business

  • Save on call costs and line rental.
  • Keep and use your existing phone system.
  • Enjoy crystal clear voice calls.
  • Carry-over your number from other providers.
  • Scale your telephone lines quickly & easily.
  • Flexible pricing & 24/7 Australian based support.

Prosum SIP Trunking Plans & Pricing

We offer the flexibility of two plans. Pay-as-you-go SIP trunks & only pay for what you use and nothing more, or unlimited monthly call plans.

(All pricing is ex.GST)

Pay-As-You-Go Plan

Pay-as-you-go for all the calls you make every month within Australia using our LOW call rates with per-second billing.

  • 5  SIP Lines – $15.00 month

  • 10 SIP Lines – $30.00 month

  • 20 SIP Lines – $60.00 month

  • 30 SIP Lines – $90.00 month

Call Rates

  • Local Calls: $0.10 per call
  • National Calls: $0.05 per minute
  • Fixed to Mobile: $0.13 per minute
  • 13/1300 Outbound: $0.30 per call

Unlimited Call Plan

Our predictable monthly payment plan includes UNLIMITED calls to local, national & fixed to mobiles within Australia.

  • 5  SIP Lines – $265.00 month

  • 10 SIP Lines – $530.00 month

  • 20 SIP Lines – $1060.00 month

  • 30 SIP Lines – $1590.00 month

Call Rates

  • 13/1300 Outbound: $0.30 per call

Optional Add-Ons

DID Numbers

  • Single Number – $1.00/month
  • 100 Numbers – $39.00/month
(All pricing is ex.GST)

Number Porting

$195.00 – once-off cost.

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

(All pricing is ex.GST)


Need a custom quote? Talk to a SIP expert on 1800 007 229.


Is your business still using traditional phone lines?

Starting from the end of September, ISDN services will begin disconnection.

The clock is ticking for companies relying on  ISDN to find an alternative solution. Don’t wait to be cut off, act now. Upgrade to SIP Trunks today and beat the rush to ensure no loss of phone service.

Why Prosum for SIP Trunks?

  • Backed by Australian Tier 1 Carriers

  • Highly Redundant & Secure Service

  • 99.95% SLA’s on SIP Trunks

  • Flexible Call Plans

  • No Lock-in Contracts

  • 24/7 Australian Based Support

What our customers say about us

  • Thank you to Dino, Chris & the Prosum team. Your team is amazing, extremely helpful and have delivered a product that is second to none. We had previously dealt with other providers and their communications team, network and equipment do not compare to what we have received through Prosum. Elite Property Management highly recommends you. Thank you again.