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SIP Trunking Australia
Keep Your PBX, Cut Your Call Costs

Connect your existing PBX to our modern VoIP network with SIP trunking from NW Networks. Australian businesses use SIP trunks to replace ageing ISDN and copper lines  without throwing out phone hardware that still works. Lower call costs, flexible channels, and genuine local support.

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How SIP Trunking Works in Australia — Three Simple Steps

  • 1
    Connect Your Existing PBX
    We link your current on-premise PBX system to our VoIP network no need to replace hardware that still works.
  • 2
    Choose Your Channels
    Select how many concurrent calls your business needs. Need 5 channels today and 20 next year? No problem — scale at anytime.
  • 3
    Select a Plan
    Pick the plan that matches your call volume and feature requirements. Our local support team can walk you through which option fits best.
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how SIP trunking works diagram — Australia
Real Cost Savings

Businesses moving from ISDN or traditional lines to SIP trunking typically cut their call costs significantly — with predictable monthly pricing and no line rental surprises.

Works With Your Existing PBX

Full compatibility with Yealink, Cisco, Avaya, 3CX, FreePBX and most SIP-compliant systems. Keep the hardware you've already paid for.

Australian-Hosted Network

Your calls run on secure, redundant Australian infrastructure — lower latency, better call quality, and your data stays onshore.

ISDN Replacement Ready

With ISDN being phased out across Australia, SIP trunking is the natural replacement. We manage the whole migration — including number porting with zero disruption.

Why Australian Businesses Choose NW Networks for SIP Trunking

What’s Included in Every SIP Trunk Plan

Every NW Networks SIP trunk is built on secure, Australian-hosted infrastructure — with everything a business needs to modernise its phone system.

01

Core Inclusions

  • Inbound and outbound calling
  • Flexible channel scaling
  • Smart call routing and forwarding
  • Full VoIP and PBX compatibility (Yealink, Cisco, Avaya, 3CX, and more)
  • Secure, encrypted infrastructure
  • Australian-hosted platform

02

Optional Add-ons

  • Call recording (compliance and quality)
  • Advanced analytics and reporting
  • Additional local, national, or 1300/1800 numbers
  • International calling packs
Common Questions

SIP Trunking Australia — Frequently Asked Questions

SIP trunking connects your existing on-premise PBX to a VoIP network over the internet, replacing traditional phone lines like ISDN or copper. Your phones and PBX keep working exactly as before — only the line behind them changes, at a much lower cost.

Yes — this is the most common reason Australian businesses switch. With ISDN being phased out across Australia, SIP trunking is the direct replacement, typically at a significantly lower monthly cost. We handle the full migration for you.

Almost certainly. Our SIP trunks are compatible with all major PBX systems including Yealink, Cisco, Avaya, 3CX, and FreePBX. We confirm compatibility before you commit.

A general rule is one channel per 3–4 staff who actively use the phone. We analyse your real call patterns and recommend the right count — and you can scale up or down anytime.

Yes. We manage the full number porting process as part of setup, so your customers keep calling the same numbers with no disruption.

Yes. While we're based in Karratha, WA, our SIP trunking is delivered entirely over the internet — we support businesses across Australia with remote provisioning and ongoing local support.

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Upgrade Your
Business Communication Today

Switch to NW Networks SIP trunking and modernise your communication system without replacing your existing infrastructure. Don’t have a PBX yet? See our business phone systems or fully managed hosted PBX instead.

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