Aastra Telecom 57I C53I User Guide

Operational Features

41-001160-00, Rev 01  Release 2.0

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Operational IP Phone Features

You can configure the softkeys and programmable keys (53i has programmable 
keys only) to perform specific functions on the IP phones.

The 55i IP phone has 6 softkeys you can configure to perform specific functions, 
The 57i and 57i CT IP phones have 12 softkeys you can configure. With up to 3 
Expansion Modules attached to the phone, you can get an additional 72 softkeys 
to configure (not all functions apply to Expansion Module softkeys). The 
following table provides the number of softkeys 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. Valid for 55i, 57i, and 57i CT phones.

**The 560EM expansion module consists of 60 softkeys. You can have up to 3 expansion modules on an IP 
phone totaling 180 softkeys. Valid for 57i and 57i CT phones only.

When entering definitions for softkeys, the “#” sign must be 

enclosed in quotes.

IP Phone 

Model

Softkeys 

Additional Softkeys 

with Expansion 

Modules

Programmable 

Keys 

55i

6

36 to 108*

(Model 536EM)

6

9

-

57i

12

36 to 108*

(Model 536EM)

60 to 180**

(Model 560EM)

-

9

-

57i CT

12

36 to 108* on Base 

Station

(Model 536EM)

60 to 180** on Base 

Station

(Model 560EM)

-

9

15