Ericsson 4187 Plus - Manual (Page 20)

Incoming Calls
Dialog 4187 Plus 20
To restore Parallel Ringing u
Lift the handset. #21#
Dial.
Note: U.K., dial
# 2 #
.
d
Replace the handset.
Notes:
If you want to restore Parallel Ringing for all phones defined
in the list, follow the procedure for restoring the feature from
the phone with the main extension number and enter the
number of the answering position.
If you want to restore Parallel Ringing for one specific phone
in the list only, follow the procedure for restoring the feature
from this phone and enter its extension number.