Aastra Telecom IP Phone - Manual (Page 113)

Model 57i IP Phone User Guide 105
Line Keys and Softkeys
Intercom Key
By default, the 57i has an Intercom key configured on key 4 of the top set of keys.
However, using the Aastra Web UI, you can assign the Intercom key to any softkey
on the top or bottom keys on the phone..
You can use the Intercom key to automatically connect with a remote extension for
outgoing calls, and to answer an incoming intercom call.
Reference
For more information about the Intercom key, see "Using Intercom" on page 116 .
Intercom
Key