Toshiba IPT - Manual (Page 100)

Centrex Application
Delayed Ringing
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Strata CTX DKT/IPT Telephone 10/03
Delayed Ringing
Outside line or Centrex line(s) can be programmed for a 12-second and/or 24-second
ring delay at stations to permit alternate answering conditions. Answer the line when
your telephone is ringing.