SIP Trunking
Reliable connectivity for your onsite phone system
SIP trunking is a service that enables companies to connect their onsite IP PBX (phone system) to an Internet Telephony Service Provider (ITSP) for services such as inbound phone numbers and outbound call termination. It serves as a modern replacement for traditional PSTN phone lines. SIP trunking can be used over both public internet connections and private IP networks.
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SIP trunk rates & plans
SIP Line
- AUSTRALIAN LOCAL & NATIONAL 9c per call
- AUSTRALIAN MOBILES 4.9c per minute (rated per second)
- 13/1300 22c per call
- PURCHASED SEPARATELY:
- ADDITIONAL INBOUND CHANNELS $1.50 per channel / per month
- AUSTRALIAN LOCAL PHONE NUMBER $1.05 per month
SIP Line
- AUSTRALIAN LOCAL & NATIONAL Unlimited*
- AUSTRALIAN MOBILES Unlimited*
- 13/1300 20c per call
- PURCHASED SEPARATELY:
- ADDITIONAL INBOUND CHANNELS $1.50 per channel / per month
- AUSTRALIAN LOCAL PHONE NUMBER $1.05 per month
SIP Line
- AUSTRALIAN LOCAL & NATIONAL
- Unlimited*
- AUSTRALIAN MOBILES
- Unlimited*
- 13/1300
- Unlimited*
- Free unlimited calls to 50+ countries
- PURCHASED SEPARATELY:
- ADDITIONAL INBOUND CHANNELS
- $1.50 per channel / per month
- AUSTRALIAN LOCAL PHONE NUMBER
- $1.05 per month
* Fair use policy applies to
all call plans and services
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Advanced functionality
Our SIP trunk service is fully integrated with our PBX system, allowing you to configure unique features that are typically not available with standard SIP trunk services. This integration enhances functionality and provides added flexibility for your communication needs

SIP trunk object within PBX can be configured in two different modes:
This mode is useful when you want to send a call to a specific SIP address. The SIP URI must follow this format:
<remote_number>@<remote_server>:<port>
For example:61399997999@sipserver.com:5060
or61399997999@111.22.33.44:5060
.
Register your SIP server with us (e.g., connect your PBX to our system) and enjoy low VoIP rates along with full integration between your onsite and hosted PBX systems. This allows your PBX to call users on our system, dial out to the world, and enables PBX users to call extensions on your PBX seamlessly.
Get your FREE account today and try it for yourself
SLA Guaranteed uptime of 99.9% for your mission critical business phone system
Phonecloud provides reliable, high-quality business VoIP services backed by comprehensive system redundancy and Australian-based technical support.
Our servers are independently monitored for uptime by Hyperspin.com, which ensures any service interruptions are detected and addressed immediately through automatic outage notifications. We are committed to delivering exceptional service with minimal downtime, ensuring your business stays connected and productive at all times. Whether you’re scaling your communication needs or integrating with existing systems, VoIPLine Telecom is here to support your business growth with trusted, secure solutions.
Our team will work together with your business to achieve maximum uptime by checking your existing internet connectivity, organising new reliable links and providing expert advice.
Current Service Status
Independently monitored
by Hyperspin.com,
one of the leading independent network
monitoring services with advanced reporting &
notification systems.
SIP trunking
Frequently asked questions
It’s not about the difference between SIP trunking and Hosted PBX, but how these two services work together. SIP trunking connects your VoIP-compatible onsite phone system to the cloud, providing connectivity to the outside world. Hosted PBX, on the other hand, is a fully functional telephony system that operates over the internet. By interconnecting these two services, you can leverage the features of Hosted PBX, such as providing inbound toll-free numbers or call recording, while still utilizing the reliability and flexibility of SIP trunking for your communication needs.
SIP trunking replaces older PSTN and ISDN phone lines by using the Internet to transmit voice data. Key benefits of SIP trunking include:
- Lower cost compared to traditional PSTN and ISDN connections.
- Scalability: Easily scale up or down based on the number of channels or simultaneous calls required.
- Portability: SIP trunking can be used anywhere with Internet access, making it easy to relocate.
- Security and Quality: SIP trunks can be configured to encrypt all voice data and support HD voice codecs, offering significantly better voice quality.
A SIP channel is used for one incoming or outgoing call, similar to a standard phone line. Each SIP trunk can support multiple SIP channels, allowing you to handle multiple simultaneous calls on the same trunk. This scalability ensures that your business can easily accommodate increased call volumes without the need for additional phone lines.
The number of channels supported by a SIP trunk is limited by your internet connection speed. However, most modern broadband connections are capable of supporting dozens of channels. For example, a 25 Mbps connection can typically support around 250+ simultaneous calls, making it a scalable and cost-effective solution for businesses with high call volumes.
The number of channels supported by your SIP trunk also depends on your onsite PBX and the codecs it supports. For example, if your PBX supports the G.729 codec, it requires only 0.03 Mbps per call, including overheads. With a reliable 8 Mbps connection, you could potentially support around 260 simultaneous calls. However, the quality of calls will be highly dependent on the reliability and stability of your internet connection. While speed is important, a stable and consistent connection is crucial for maintaining high call quality. Cheap NBN prices today enable small business to get high grade and high speed internet of above 100Mbps.
Even if your internet connection goes down, you will still be able to receive inbound calls. This is made possible through call diversion to mobile phones or alternative phone numbers. Here’s how it works: typically, an incoming call is routed to your SIP trunking system. If there’s no connection to the SIP device due to an internet outage, the call is automatically diverted to a mobile phone or any other phone number you’ve configured, ensuring you never miss an important call.
We offer discounted rates for accounts with higher call volumes. For services with a minimum monthly spend, we deduct this amount on the 1st of each month, which then becomes call credit on your account. There are no additional charges for calls up to the minimum monthly spend. Calls that exceed the minimum are billed at the standard call plan rates.


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International call rates
International call rates
Only Direct, Premium CLI enabled routes
Enter the phone number you wish to call to find the rate
For example, to find the rate for a call to Barcelona, Spain: you need to enter the country code (34) as well as the area code (932). You can also simply enter the first 3-6 digits of the phone number you intend to call.
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Let’s chat about your needs!
We’ll provide a tailored quotation and create custom call plans, integrations, and setups to match your specific requirements.
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