Aastra Telecom 6753I - Manual (Page 116)

None Key
You can set a key to force a blank entry on the IP phone display for a specific key. You do this by
setting the key to "none". If a particular key is not defined, it is ignored.
Setting a None Key
Use the following procedure to configure a None key on the 6753i IP Phone.
1. Click on Operation->Programmable Keys.
or
Click on Operation->Expansion Module <N>.
Programmable Keys and Expansion Module Keys
2. Select from "Key 3" through "Key 6".
or
Select from “Key 1” through “Key 36” (M670i).
3. In the "Type" field, select None.
4. Click to save your changes.
Aastra Web UI
Note: Keys 1 and 2 (SAVE and DELETE keys) can be made configurable ONLY
by your System Administrator.