NEC DS1000 - Manual (Page 89)

5. Press one key of the type you selected above. You see
(example for Line Key 01 shown below):
– Dial to select Ring Type A.
– Dial to select Ring Type B.
– Dial to select Ring Type C.
– Dial select Standard (i.e., normal ringing for this
type of call).
6. Press another key to program it, or exit.
81
Distinctive Ringing
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