Powered by VoIPCloud Wholesale & Aussie Broadband

SIP Trunking

Reliable connectivity for your onsite phone system

 SIP trunking is a service that allows companies to connect their onsite IP PBX (Phone system) to the Internet Telephony Service Provider (ITSP) and use its services; inbound phone numbers and outbound call termination. It is effectively a replacement of old PSTN phone lines. A SIP Trunk service can be used via public internet as well as via private IP connections.

Rates & Plans

SIP Trunk with

Unlimited* calls to Australian numbers

*Fair use policy applies

per channel /
per month



SIP Trunk with

Low monthly fee and rated calls

per channel /
per month



Call Plans

SIP Basic Business SIP 50 Business SIP 250 Business SIP 500 Business
Australian landlines
Price per call
Local and National
0c p/call 9c p/call 8c p/call 6.6 p/call
Australian mobiles
Price per minute
Rated per second
13.9c p/min 8.8c p/min 7.7c p/min 5.5c p/min
13/1300 numbers
Price per call
25 p/call 24c p/call 23c p/call 22c p/call
Minimum monthly spend
to Australian destinations
$0.00 $50.00 $250.00 $500.00

Advanced functionality

SIP trunk service is part of our mPBX system. This enables some unique features to be configured that are not normally available for SIP trunk services.

SIP trunk object within mPBX can be configured in two different modes:

This mode is useful if you want to send a call to the specified SIP address. SIP URI must be in the following format: <remote_number>@<remote_server>:<port>
example: 61399997999@sipserver.com:5060 or 61399997999@

Register your SIP Server with us (e.g. connect your PBX to us).  Enjoy low VoIP rates and complete integration between your onsite and hosted mPBX systems.
Your PBX will be able to call users on our system or dial out to the world and mPBX users will be able to call extensions on your PBX.

Try it for 14 days

Fully featured trial, no credit card required.
Configure your system
Check out the platform
Order phone numbers
Microsoft Teams Direct Routing

Frequently asked questions

SIP trunking is a way to deliver voice services over the internet. It works with a SIP enabled communication systems and handsets. SIP trunking is used to replace standard phone carrier services like ISDN, PRI and PSTN. SIP Trunk is mostly used if you have VoIP/SIP enabled onsite phone system.
VoIP is a broad term which refers to any call made over the internet rather than over a standard phone line. VoIP depends on IP (data connectivity) to transmit voice packets. SIP is a protocol used to initiate, maintain, and terminate voice communication sessions in VoIP applications. SIP protocols support the signalling and management of voice, video, and electronic messaging applications. SIP (Session initiation protocol) is used in VoIP (Voice over IP) technology.
SIP Trunks is a way of getting your onsite phone system connected to the outside world. SIP trunk replaces older PSTN and ISDN phone lines and uses the Internet to transmit voice data. Key benefits of SIP Trunks is lower cost compared to older PSTN / ISDN connections, ability to easily scale up or down with the number of channels (or simultaneous calls required). It is also easy to relocate as you could use your SIP Trunk anywhere you can get access to the internet. SIP Trunks can be configured to encrypt all voice data before transmission and allow for HD voice codes with significantly better voice quality to be enabled. SIP Trunks are also significantly cheaper compared to older PSTN or ISDN lines.
A SIP channel is used for one incoming or outgoing call. You can think about it as a sort of a standard phone line. Every SIP trunk can support multiple SIP channels. Number of channels is limited by your Internet connection speed, but most of the modern broadband connections are capable of supporting dozens of channels. E.g. 10Mbps connection could support about 100 simultaneous calls.
SIP trunking was designed to effectively replace older T1 or PRI lines. They allow you to connect your onsite IP phone system to the outside world. Rather than routing voice calls over copper lines and dedicated circuit-switched networks, SIP trunking involves sending the voice calls over data networks like the Internet or enterprise local area network.
Number of channels supported by SIP Trunk is limited by your Internet connection speed, but most of the modern broadband connections are capable of supporting dozens of channels. E.g. 10Mbps connection could support about 100 simultaneous calls. You would also need to order required number of SIP channels via customer billing portal.

VoIP (Voice over IP) requires data connection between your premises and our servers. In most cases it would be public internet. However you only need a tiny amount of bandwidth – connection speed in order to use VoIP. Each channel requires 80Kbps (0.08 Mbps), or using compressed codec even smaller – 0.03Mbps. Quality of VoIP will highly depend on the reliability of your internet connection. It does not have to be very fast, but it must be reliable and stable. We also recommend using dedicated internet link for setups with over 5 phones.

We have multiple solutions that can make sure you can continue to receive calls even when your internet goes down. You can have calls diverted to your mobile phone if you are offline, this way you can continue to receive calls without any internet. You can also have multiple internet connections for redundancy so if one connection fails you can continue to use the other.
Simply speaking – it is better than using traditional phone lines. We use G722 (High Definition Voice Codec). Connection will be crystal clear and better compared to normal PSTN services. Also, unlike many other services, all our equipment is hosted locally, meaning that there will be no delays in voice transmission.
Our systems are optimized for reliability, not price. We guarantee 99.9% SLA backed uptime on all our systems. All parts of the system are fully redundant, meaning that there is no single point of failure. This is not just words. We use independent monitoring company called hyperspin.com to monitor our server uptime. Visit our system uptime page.
We offer lower rates for larger call volume accounts. For services with minimum monthly spend we deduct the minimum monthly spend amount on the 1st of each month and this amount becomes call credit on your account. There are no extra charges for calls up to the minimum monthly spend, calls over are charged at the call plan rates.
We have client testimonials on our testimonials page.
Our head office is in Melbourne Australia with our servers located in Equinix ME1 data centre. All sales and support is handled by our highly trained staff.
Almost all Australian telephone numbers can be ported into our system. Any Australian numbers that we provide or are ported into our service can be ported to another provider as long as that provider is willing to take on the number.

Happy Customers

Great Customer Service
25+ Awesome Features
24/7 Australian Support

    5 star review  VoIPSmart went above and beyond to keep my business connected when no one else could. Excellent service and a pleasure to deal with.

    thumb Phillip Miles

    5 star review  I cannot rate the service highly enough. Damien went above and beyond assisting me and our business with our full phone system upgrade onto voip platform. He was very trustworthy, to the point and very well priced. Any question I had, he was onto it within minutes. Damien set every phone up and changed the call settings exactly as we needed them to work, all remotely. I am a little OCD and nothing was any trouble. Don't look anywhere else. Highly recommend. Kylie - Pacific Security Group Brisbane

    thumb Kylie B

    5 star review  Damien has been extremely helpful in guiding our business through to process of setting a PBx phone system. I'd highly recommend him to any new clients that are running simplified phone systems without any decent features. It's worth the investment, and by that it is small!

    thumb Kevin Tran

    5 star review  We contacted Damien to help us with our small business VOIP set up and found him to be excellent. He is incredibly knowledgeable, helpful, patient and diligent. He was willing to go the extra distance to get our system set up. I would not hesitate to recommend Damien.

    thumb Craig Sutton

    5 star review  Damien is a true professional! He assisted with the transition to our new services, and it was seamless and easy to deal with him. We had a technical issue with the intercom, and the diligence Damien showed during this process was second to none... He keeps us informed, updated along the way, and always delivers what he said he would. Really great to have experienced this service from Damien! Thank you again Damien.

    thumb Kim Wethmar

    5 star review  VoIPSmart has helped us to track and monitor our phone calls and to provide a unique number for another business. Great service & product. Highly recommended.

    thumb Omega Digital

Get In Touch

We can create custom call plans, integrate with third party systems and customise the setup to create a custom solution based on your requirements.