AT&T Z812 User Manual page 35

Choose a TTY mode after connecting the
TTY device to the phone's headset port.
TTY mode
A TTY device can allow people who
have hearing or speech disabilities
to communicate by telephone.
Turn on/off hearing aid compatibility.
When you turn on the hearing aid
Hearing aids
compatibility and use a hearing aid with a
Telecoil to answer the phone, it will help
you hear more clearly during the phone
call.
Speed dial Set speed dialing keys.
Set the length of dual-tone multi-frequency
DTMF tones
(DTMF) signal tones: Normal or Long.
Call ended operation
Check this option to show operation tips
tips
when the call is ended.
Call Barring Settings Forbid certain types of calls.
Phone Calls 35