IBM 4 LINE TELEPHONE WITH CALLER ID -412CID - Manual (Page 36)

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TECHNICAL SPECIFICATIONS
Flash Rate for Lights
On Steady Solid light.
Flashing Slowly 1 sec on, 1 sec off, repeatedly.
Flashing Rapidly: 0.125 sec on, 0.125 sec off, repeatedly.
Blink 1: 1.875 sec on, 0.125 sec off, repeatedly.
Blink 2: 0.875 sec on, 0.125 sec off, repeatedly.
Blink 3: 0.125 sec on, 0.875 sec off, repeatedly.
Sound Rate of Intercom Buzzer
Ring: 0.25 sec on.
Double ring: 0.25 sec on, 0.25 sec off, 0.25 sec on, 0.25 sec off.
ICM ring: 0.25 sec on, 0.25 sec off, 0.25 sec on, 1.25 sec off, repeatedly
Transfer ring: 1 sec on, 1 sec off, repeatedly.
ID-error ring: 0.25 sec on, 0.25 sec off, repeatedly.
Tones
Dial tone: Continuous tone.
Busy tone: 0.25 sec on, 0.25 sec off, repeatedly.
DND tone: 0.5 sec on, 0.5 sec off, repeatedly.
Ring back tone 1 sec on, 1 sec off, repeatedly