Tried and tested SIP trunk solutions

A SIP trunk is a direct replacement for a traditional PSTN or ISDN line, made essential by the NBN rollout. SIP trunks are the next generation of phone lines and can be run over a variety of different networks, the most common being the public Internet (i.e., the NBN). SIP trunks connect to existing phone systems, either at a client’s premises, in one of our secure data centres, or elsewhere on the public internet.

We set-up and configure correctly:

A SIP trunk is a direct replacement for a traditional PSTN or ISDN line. The rollout of the NBN in Australia means that most of the PSTN and ISDN network in the country will be shutdown, and will need to be replaced by IP telephony solutions instead.

However, if a SIP trunk is not setup and configured correctly, phone call quality will most likely suffer. This is why VoIP and SIP services have had bad wrap over the last few years – not because the technology itself is flawed – but the way inexperienced IT administrators deploy the IP telephony services gives users the impression the fault is with the technology.

When implemented correctly, SIP trunks can be more reliable than traditional phone services. These solutions can also result in call quality that is superior to PSTN and ISDN.

NetVault SIP trunks have been thoroughly tested with a range of third party PBX vendors. Let us show you the right way of deploying SIP trunk, with our time and tested solutions. 

NetVault SIP Trunk attributes


A SIP trunk is the easiest, fastest way to keep using the existing PBX at a business premises. It allows for existing investments in PBX hardware (that a client might have already made) to be fully utilised.

Remote offices with local numbers

Choose numbers from geographic regions that match your physical location. Consolidate remote workers and outsourced branches with a universal business phone number.

Caller ID over stamping

Caller ID over stamping is available to show a single phone number for all your office calls. This is a great way to ensure that when a customer’s call is returned, it can be answered by a central receptionist or call group.

Disaster recovery

All SIP plans come with 2 redundant SIP servers with separate sessions to ensure maximum service uptime.

Consolidated network management

Multiple offices, with multiple difference PBXs can be billed as a single entity bill to make accounts processes seamless and efficient.

Multiple DID options

Choose as many DIDs as you need for your business’s needs. You only need 1 for a working SIP trunk, but if you would like to create advanced call routing rules, choose as many numbers as you need.

Local and toll-free numbers

Pair your ISP trunk with 1300/1800 numbers to give your client’s and their business the professional touch.

Fully compatible

NetVault SIP trunks have been thoroughly tested with a range of third party PBX vendors. If it’s out there — it most likely works!


Start with as few as two SIP trunks/channels and scale up to an unlimited number of trunks/channels when your needs grow.


SIP trunks are typically half the overall costs of similar solutions form larger carriers like Telstra and Optus.

Automatic failover and built-in redundancy

Should your PBX be unavailable, calls can be automatically re-routed to an alternate number, like a mobile phone. This is so that your calls are always answered.