New Zealand's Preferred SIP Trunk Provider

The reliable, cost effective solution for your business telecommunications
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SIP Trunking for businesses across NZ

Businesses of all sizes benefit from the cost savings and additional features that switching to SIP trunking brings.

Our enterprise-grade SIP trunks are configured to work with all major IP PBXs, and we are proudly a certified 3CX SIP trunk provider.

When you parter with Aatrox Communications, you parter with a local New Zealand brand with a friendly team always ready to help.

Ready to find out more? Get in touch with us today!

SIP phone

What is SIP Trunking?

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

SIP essentially removes the need for physical phone lines, and instead uses IP (Internet Protocol – or – the internet) instead. 

Cost Effective

Competitive SIP trunk pricing 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.
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.

Frequently Asked Questions

How do I use a SIP Trunk?

When you order a SIP Trunk from Aatrox Communications you receive a URL, number, and authentication information.

On your PABX or device you enter these details, which allows the SIP trunk to be “registered” to you.

That’s it!

Calls made to the numbers assigned to your SIP Trunk will be routed over your SIP Trunk, and you can choose where and how they are treated from there (for example ringing a single handset, going to voicemail, or using something like a call queue, hunt group, or IVR).

Note: To get the most out of your PABX and SIP trunks you may choose to configure plenty of different options for routing, codec usage, number masking, and so on.

We’re more than happy to have a chat with you about your specific requirements.

How many calls can a SIP trunk handle?

A SIP trunk is made up of a number of SIP lines or SIP channels. Each SIP line can handle one call at a time, either incoming or outgoing and including calls placed on hold. 

Learn more about how many SIP trunks your business may need.

Are Aatrox Communications SIP Trunks expensive to implement?

Every deployment is different, but with Aatrox Communications SIP Trunks we’ve helped many companies reduce their phone bills by up to 60%.

Our SIP Trunks should reduce both the fixed infrastructure portion of your bill, and the call cost portion.

How do Aatrox Communications SIP Trunks compare to others?

We believe that our SIP Trunks represent the best value available in Australia.

We have worked hard and invested in our infrastructure to ensure that our call quality is excellent and extremely reliable, and in our team to make sure that there is always a highly skilled engineer available to answer your call.

All of our infrastructure is in Tier 1 data centres within Australia to provide the lowest possible latency (learn more about our infrastructure) and all of our team is located in Melbourne and Sydney.

We’re consistently told that the support we provide is second to none.

Feel free to stop by for a visit!

How much expertise do I need to get started with VoIP?

You need to be comfortable setting up and managing your PABX.

Aatrox Communications can provide assistance with SIP Trunk registration and compatibility – but ultimately you are responsible for running and configuring your PABX.

If this is not something you’re comfortable with, give us a call – we work with some great Hosted PABX providers that we’re more than happy to put you in touch with.


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

3CX partner
3CX advanced certified
3CX certified engineer

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