# Putting a digital system phone into operation

Digital system phones do not have to be logged on. A digital system phone is recognised the moment you connect it to a DSI interface of the communication server.

## Expanding system phones with expansion key modules

Depending on the model you can expand a system phone with up to three expansion key modules:

- Connect the expansion key module or modules to the system phone.

- Press any configurable key for at least 2 seconds.

  The communication server detects the newly expansion key modules and you can configure the keys using WebAdmin.

Parent topic: Putting telephones and terminals into operation
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