Samsung SCH-L710RWBXAR - Manual (Page 74)

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Other call settings
Ⅲ From the Call settings screen, under Other call settings,
and configure the following options:
• Auto retry: When enabled, your phone automatically redials a
call if it receives a busy signal from the network.
• TTY mode: Choose a TTY mode to enable TTY mode, for use
with optional TTY equipment.
• DTMF tones: Set the length of Dual-tone Multi-frequency
tones, that play when you use the keypad during a call, such as
when navigating phone menus.
• Voice privacy: When enabled, activates Enhanced voice
privacy (when available), to improve the security of your phone
calls.