Ericsson 4187 Plus - Manual (Page 90)

Settings
Dialog 4187 Plus 90
Message Waiting indication
Your incoming messages can be indicated by a flashing Message
key. It is possible that the line leads to the phone could be twisted
after installation (the Message Waiting LED will be on when there is
no Message Waiting signal and will go off when there is a Message
Waiting signal). To solve this problem there are three possible
settings for the Message Waiting indication:
•
STD This setting should be used when no Message Waiting
indication is required. This is also the default setting upon
delivery.
• MW+. Use this position when Message Waiting indication is
required and the line cabling is straight.
• MW-. Use this position when Message Waiting indication is
required and the line cabling is twisted.
On the bottom side of your phone:
Slide the switch to the required position.
Enable/Disable function key
programming
It is possible to enable or disable programming of the function keys
using a switch. When the switch is set in the Off position,
programming is not possible (i.e. the memory content is locked).
On the bottom side of your phone:
Slide the switch to the required position.