AASTRA DT4x2 for MD Evolution User Guide EN - Manual (Page 154)

Troubleshooting
MD Evolution – Cordless DT412 / DT422 / DT432 154
Keys locked
Unlock
The key pad is
locked.
Press Menu key
followed by
*
.
No system Cannot connect to
the network, the
phone is not
registered or out of
range.
Contact system
administrator.
Fault / Display Probable cause Action or
comment