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.

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Set of advanced call routing features at no additional cost

SIP trunk rates & plans

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Advanced functionality

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

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

Diversion to SIP URI

This mode is useful if you want to send a call to the specified SIP address. SIP URI must be in the following format: @: example: or 61399997999@

Create SIP registration

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 PBX systems. Your PBX will be able to call users on our system or dial out to the world and PBX users will be able to call extensions on your PBX.

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SLA Guaranteed uptime of 99.9% for your mission critical business phone system

VoIPLine Telecom provides business grade VoIP connectivity, complete system redundancy and Australian based technical support. Our servers are independently monitored for uptime by – who also provides us with automatic outage notifications.

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.

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Independently monitored by, 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 them but how these two services cooperate with each other. SIP trunking is a service that allows you to connect your VoIP compatible onsite phone system to the cloud to have a connectivity with the outside world. Hosted PBX is already a telephony system that operates via the Internet but you can interconnect them to use some of the hosted PBX features with SIP trunking, e.g. provide an inbound toll-free number or record calls.

SIP trunkng replaces older PSTN and ISDN phone lines and uses the Internet to transmit voice data. Key benefits of SIP Trunking are:

  • – Lower cost compared to older PSTN and 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 Trunk can be configured to encrypt all voice data before transmission and allow for HD voice codes with significantly better voice quality to be enabled.

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 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. 10 Mbps connection could support about 100 simultaneous calls.

This depends on your onsite PBX and its supported codecs. If your PBX supports G.729, you only require 0.03 Mbps including overheads. Therefore, if you have a reliable connection of even 8 Mbps, you could have about 260 simultaneous calls connected. However, quality of calls will highly depend on the reliability of your internet connection, so it does not have to be very fast but it must be reliable and stable.

Even if your Internet connection goes down, you’ll still continue to receive inbound calls. This is possible thanks to diversion of calls to mobile phones. How it works: commonly a call is coming to the inbound number and then passes to SIP trunking. In case there’s no connection with the SIP device due to lack of internet connection, a call will transfer to mobile phone or any other phone number you will configure.

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./p>

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