Do all telecommunications products have to have an A-Tick?

Telecommunications products must have an A-Tick or display the labels of previous labelling
schemes such as the Telecom Authorisation or AUSTEL permit. Products without an A-Tick or
 the previously accepted labels may be unsafe and cause damage when connected to the
network.

You should be also aware that it is illegal to connect equipment that does not carry a
compliance label and penalties can be imposed.