SIP Trunking

C2comm SIP Trunks Are Tier 1 Carried

C2comm SIP Trunks are provisioned on Tier 1 carriage to provide fast provisioning of new services, excellent quality of service, and direct routing to the Australian telco network.

Our services ensure your telephony bill from a traditional carrier will reduce by 50% on call costs, and line and number rental.

3CX  Supported VoIP Provider

C2comm SIP Trunks were the first 3CX supported SIP services in Australia. We have maintained our record for excellent service delivery and commitment to the platform since then, our efforts have continued to be recognised with our unbroken record of consecutive years as a 3CX Titanium Partner and Preferred VoIP Provider.

Pricing Guide

Our full rate card available here.


SIP Line $10 per month

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National Calls $0.10 per call

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Local Calls $0.10 per call

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Mobile Calls $0.22 per min billed per second no minimum

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How it Works

C2comm SIP Trunks are provisioned per request on our Tier 1 carriage Softswitch. Our SIP Trunks register onto our network using 3-way authentication from your 3CX Phone System. As a Preferred VoIP Partner, C2comm’s authentication templates can be found in the VoIP registration field of the PBX. To see how to authenticate a C2comm SIP Trunk in detail follow our guide.

Signing Up

To sign up to our SIP Trunking service you will be required to meet our pre-requisites.

  • Have or planning to have a 3CX Phone System or a similar IP-based PBX
  • A business-grade broadband connection – this does not include NBN services


SIP trunking australia

Our Customers

Benefit from a strong relationship with a service provider that delivers.

What Our Clients Say

  • Fantastic support and staff, they truly understand what it means to be a business partner.


  • We’ve had these guys looking after our phone and I.T. needs at work since 2010 and they’ve always been fantastic. Service is always spot on and they’ve never let us down. I won’t even speak to any other company trying to poach our business.


  • The technical and professional staff at C2 Communications have been extremely helpful in getting our entire IT&T networks to work smoothly and effectively across several Melbourne offices. With the high volume of telephone calls made, we have certainly benefited economically with the decision to install 3CX. The IT team has been highly responsive and we would not hesitate in recommending both their IT services and VoIP solutions.


  • C2 Communications installed our 3CX phone system and it works seamlessly between our several sites. The changeover to using SIP lines has proven to be extremely cost effective. After the installation, our staff were trained on how to manage the system internally and we are particularly impressed with its reliability and functionality. It’s definitely been a positive move for our business.