Tones

Tones are audible in the handset.

Dial tone (System ready to accept digits)
Special dial tone (System ready to accept digits, active diversion on telephone)
Ringing tone (Ringing signal to called party)				- repeated after 4 s
Special ringing tone (Ringing signal to Line 2)				- repeated after 4 s
Busy tone (Called party is busy)
Number unobtainable tone (Called number not accessible or vacant)
Call Waiting tone
Blocking tone (Call cannot be executed due to congestion or called party blocked)
Verification tone (Verification that ordered function is accessed)
Intrusion tone (Sent to all parties during Intrusion)
Conference tone (Sent to all participants in a Conference)				- repeated after 15 s

Signals

Ringing signals are emitted from the phone.

Internal ringing signal				- repeated after 4 s
External ringing signal				- repeated after 4 s
Automatic Callback signal

Note:

The tones and ringing signals in this guide refer to the standard system but may vary between countries.