Encryption Check; Environment Muting - NEC DECT G355 Administrator's Manual

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Encryption Check

This is used to determine whether or not the handset can be used
to make encrypted calls only. It is strongly advised not to set this
check to as that increases the risk of unauthorized listening in
Off
to calls being made to and from the handset.
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Open the Service Menu
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Environment Muting

This is used to adjust the muting behavior of the handset with
respect to dealing with so called "bit errors" in the voice RTP
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:
Or
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Or
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Service Menu
Select the required Central
Directory
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