Perfect for combining your voice and data into a single, reliable access

ISDN (Integrated Subscriber Digital Network) is a popular connection for combining voice and data networking needs into a single access. We offer a competitively-priced solution that both provide simultaneous, quality connections in any combination of data, voice, video faxes and EFTPOS transactions over a single physical connection.

Our ISDN services give you the flexibility to control the way your ISDN line is used at any one time and it is simple and easy to install.

High-quality data links

Dialed point-to-point data links provide quality connections for internet access and video conferencing.


Choose how your ISDN is used at any one time – use it for data or a combination of data, phone or fax.

Single access

Maintain all of your communication over a single line.

Easy installs

A discreetly-sized Network Terminating Unit (NTU) can be placed on a desk or mounted on a wall.

PBX trunks

Default method for connecting trunks to modern PBXs.

Cost effective

Available at a lower cost than older analogue trunks.


Enables organic growth as your business grows.


A 24/7 help desk and faults team available for any queries regarding change and billing requests.

ISDN is billed on a per connection, per month basis – standard calling rates apply as specified in your Spark contract.  An additional one-off installation fee applies. Minimum 24-month term applies. Contract disconnection fees may apply if your contract ends early. Self-supplied devices or PABX’s must have a Spark Permit To Connect certification.  Spark terms and conditions apply.

Available extras

Get started

Already a Spark customer? Ask your Client Manager about ISDN.