SIP Trunk

Say goodbye to ISDN

SIP trunks offer a more flexible and lower cost alternative to ISDN for inbound and outbound voice calls. SIP trunking is a standards-based replacement for traditional ISDN. It connects your PBX to the PSTN via broadband, ethernet or private circuit into our national network.

Compared to ISDN our SIP trunking service is less costly per channel and more flexible in how and where geographic telephone numbers can be used. It’s also quicker to install and provision and, as standard, it delivers extremely robust business continuity.

The service can support connections ranging from two channels for small PBX-equipped businesses to an unlimited number of channels for large enterprises.

Any business with a PBX can switch to our SIP trunking service and immediately benefit from a more flexible, less expensive and more resilient phone service.

Save money on call costs and line rental

SIP delivers less costly, more reliable connectivity than ISDN over an IP connection. It can save up to 50% on line rentals and 25% or more on call costs.

Flexible call tariffs

Whether your calls are constant, seasonal, local, long distance or international, Fibre2air can build flexible and cost-effective solutions to match your business' unique calling patterns.

Scale up and down when you want

SIP trunks are ideal if you are moving, upsizing or downsizing and want to keep your existing numbers. Scale up lines during busy periods and back down again afterwards. You can add lines, take them away, split calls at any time. You are always in control.

Built-in Business Continuity

SIP trunks can handle emergencies easily. They are inherently disaster recovery / business continuity ready, letting you reroute calls to an alternative location quickly and easily.

Simple management

Get one provider with one bill and one point of contact; receive 24/7 support to minimise hassles and improve business continuity.


Parameter Specifications
Configuration5 channels to thousands
Access Networks Fibre400
Mid-Band Ethernet
Ethernet over SDH
Ethernet over Fibre
Third party Ethernet
PABX Support All major vendors. Contact Fibre2air for the full list.
Local Number PortabilityYes with participating carriers
Site RequirementsRack space (1RU) and 240V AC 50Hz power to be provided by the Customer
ReportingSummary invoice and individual call details
Contract TermsMinimum contract term is 12 months. Longer contract terms (e.g. 24 months, 36 months and
longer) are available and attract term discounts.
Provisioning TargetsFibre2air infrastructure: 25 working days (metro), 30 working days (regional) or as advised (third party).
Fibre2air infrastructure physical modifications: 10 working days (metro), 15 working days (regional)
or as advised (third party).
Fibre2air infrastructure logical modifications: 5 working days.
Outage Restoration Targets
(Access network dependent)
Fibre2air infrastructure: 4 hours (metro) or 4 hours + 1 business day where a site visit is required (regional).
Third party: 8 hours (metro) or 8 hours + 1 business day where a site visit is required (regional).
RequirementsAn IP enabled PBX or SIP Gateway device so you can connect to Fibre2air via Ethernet

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