Aastra Telecom C53I User Guide

Operational Features

41-001160-00, Rev 01  Release 2.0

5-27

Operational IP Phone Features

The following table provides the number of softkeys and programmable keys you 
can configure, and the number of lines available for each type of phone.

*The 536EM expansion module consists of 36 softkeys. You can have up to 3 expansion modules on an IP phone 
totaling 108 softkeys.

IP Phone 

Model

Softkeys 

Additional Softkeys 

with Expansion 

Modules

Programmable 

Keys 

53i

-

-

6

9

-

55i

6

36 to 108*

(Model 536EM)

6

9

-