AASTRA 4425 IP Vision (SIP) for MX-ONE User Guide - Manual (Page 80)

81 Dialog 4425 IP Vision
Group Features
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, enter your own extension number and press.
Note: U.K., dial
* 2 *
No
#
.
Call Press.
To re-enter the group #21#
Dial.
Note: U.K., dial
# 2 #
Call Press.