Calling From A Remote Phone - Sony IT-A300: Operating Instructions Manual

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@ Using the toll-saver feature (TS)
When the RINGER SELECT switch is set to TS, if any new
messages are recorded in box 1, the phone answers after 3 rings; if
not, it answers after 5 rings. When you call from a pushbutton
phone and hear more than 3 rings, you know that there are no new
messages in box 1. (If there is no new message in box 1, but some
in box 2 or 3, the phone will still answer only after 5 rings.) For
more information, see also "Adjusting the ringer mode" (page 18)
section.
42 | Remote contro! functions