AASTRA 4225 for MX-ONE Telephony Switch - Manual (Page 86)

Group features
Dialog 4223 Professional/Dialog 4225 Vision 86
Group Hunting
An internal Group Hunting number is a common directory number for a
group of extensions. Calls to the group will be indicated at a free
extension in the group.
When you leave the group temporarily, you make your phone
unavailable for incoming calls.
To leave the group temporarily
*21* z
Dial and enter your own extension number.
Note: U.K., dial
* 2 *
No.
# í
Press.
To re-enter the group
#21#
Dial.
Note: U.K., dial
# 2 #
í
Press.