Cortelco 8012 - Manual (Page 26)

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Volume Control
During a conversation, pressing or will adjust the handset receiver or
speakerphone volume level. Volume can be adjusted in 5 steps.
Message Waiting
If a voice message is received, the display will show the icon and “MSG WTG
ON “
To deactivate the icon, press the key in standby mode, then press and
hold the 4 key. Finally, press to return to standby mode.
Ringer Settings
Perform the following steps to change the ringer tone or volume. These settings can
apply to either external calls (from the telephone company) or internal calls (from
other handsets registered to the same base).
1. Press the Menu soft key.
2. Press or to choose HS Settings.