Avaya 3810 Installation And Use Manual page 45

Installation and Use
No dial tone.
Handset does
not ring.
An underscore
replaces a
character in the
handset display.
Move closer to the base unit.
The battery could be weak. Charge the battery
for 16 to 20 hours.
Check the Ringer Switch; it could be turned
off.
Make sure the base unit antenna is fully
vertical.
Move closer to the base unit.
The telephone does not recognize special
characters (for example, punctuation marks)
that are provided from the communications
system.
A Troubleshooting
45