Australia's Preferred SIP Trunk Provider

The reliable, cost effective solution for your business telecommunications
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Aatrox Communications SIP trunks are a great addition to your company’s unified communications strategy, and are configured and tested to work with 3CX IP PBX, as well as other popular PBX systems.

By specialising in providing flexible and reliable VoIP services to partners and end users, we have differentiated ourselves by being able to advise how to implement the solution from the ground up.

SIP Trunking and your business

SIP, an acronym for session initiation protocol is a signalling protocol, responsible for initiating, maintaining and ending multimedia sessions.

SIP Trunking enables you to connect your pre-existing IP PBX to your clients, operating over the IP network.

In fact, you can essentially think of it as a digital phone line replacing the traditional PSTN lines, allowing for both voice and video calls.

SIP phone

What is SIP Trunking?

While “SIP trunk” sounds like a technical term, the concept itself is rather simple:

“SIP”¬†refers to Session Initiation Protocol, responsible for sending and receiving calls, and “trunk” simply refers to a connection between two points.

SIP trunk rerouting

Simple Rerouting

A SIP phone number isn’t attached to any physical location, therefore allows for simple rerouting to different geographic locations.

SIP channels can be added or removed quickly and easily, making them a very flexible choice for telecommunications.

Cost Effective

Competitive call rates and free calling between remote offices make the change to SIP from traditional telephony a sure way to slash your phone bill.


SIP Trunking allows for the setup of a number of reliability measures including mobile failovers and hosting the SIP trunks across multiple servers.

No Physical Infrastructure

Expanding existing infrastructure no longer needs to be a costly and long process as SIP trunking removes the need for physical phone lines.


SIP Trunking opens up the possibility of fully utilizing the extensive features available in unified communications suites.


Learn more about SIP trunking and PBX technologies at our FAQ and Definitions pages

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3CX certified engineer

Aatrox Communications is an Australian owned and operated full service SIP trunk provider. We specialise in connecting the traditional telephony network to the internet for small and large businesses.