Samsung ITP-5121D 用户手册

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The system provides several tones to assist you. Some of these tones are already
familiar to you.

Intercom Dial Tone—A steady tone that indicates you can begin dialing.

DIAL TONE

CONTINUOUS

Ringback Tone—Indicates the station you dialed is ringing.

RINGBACK TONE—1000 ms ON/3000 ms OFF

CONTINUOUS

Busy Tone—Indicates the station you dialed is busy.

BUSY TONE—500 ms ON/500 ms OFF

CONTINUOUS

DND/No More Calls Tone—Fast busy tone indicates the station you dialed
is in the Do Not Disturb mode or cannot receive any more calls.

DND/NO MORE CALLS TONE—250 ms ON/250 ms OFF

FOR TEN SECONDS

Transfer/Conference Tone—Indicates your call is being held and you
can dial another party.

TRANSFER/CONF TONE—100 ms ON/100 ms OFF

CONTINUOUS

Confirmation Tone—Very short beeps followed by dial tone indicate you
have correctly set or canceled a system feature.

CONFIRMATION TONE—50 ms ON/50 ms OFF

FOR ONE SECOND
(programmable)

Error Tone—A distinctive two level beeping tone indicates you have done
something incorrectly. Try again.

ERROR TONE—50 ms of tone 1/50 ms of tone 2

FOR THREE  SECONDS