Businesses have been warned landline phone and internet telecommunications services will stop if they don't make the switch to the national broadband network (NBN) before the deadline.
Some areas in western Sydney have a deadline of January.
A spokesman for the NBN said checking the roll-out date for your area was easy.
"Just go to www.nbnco.com.au and type in your business address and you will quickly see whether work has begun as well as deadlines for your particular area," he said.
"All the information you will need to keep abreast of what is happening can be found on the site."
The national broadband network is an upgrade to Australia's existing telecommunications network.
It provides access to fast, affordable and reliable landline phone and internet services.
It will replace all existing landline phone, ADSL internet and Telstra cable internet services.
Landline phone, broadband internet including ADSL and Telstra cable, fax machines, medical alarms and emergency call systems, as well as monitored security alarm systems, and monitored fire alarm systems all have to be connected.
The NBN website has a list of service providers.
Details: 1800 687 626.
■ Devices such as eftpos alarms, machines and fax machines can work over the NBN as long as the right kind of phone service is ordered.
There are three easy steps to move to your device to the NBN.
1) Call your device provider and ask about any wiring or service changes required and what you need to do to test it once the NBN is installed.
2) Call your preferred company or internet service provider and tell them your device requirements.
3) Test each device to confirm that it's working once the NBN is installed. If it isn't working contact your device and service provider immediately.