Adjusting The Ringer Volume Level Of The Base Phone - Sony SPP-N1025 Operating Instructions Manual

Setting the ringer type (continued)
To turn the ringer on again
Follow the instructions described in "Setting the ringer type" above.
Adjusting the ringer volume level of the
base phone
Set the RINGER switch on the base phone to HIGH or LOW. To turn
the ringer off, set it to OFF.
RINGER switch
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Telephone Features