Cygnion CG 2400 - Manual (Page 227)

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Refer to the handset manual for additional
information.
I cannot subscribe a
new handset
Action Make sure that the handset is first
unsubscribed while PC software is running. (See
“Unsubscribing a Handset” on page 104 for full
procedures.)
The handsets do not
ring on an incoming call
Actions Ensure that the external line’s incoming
routing option under system configuration indicates
that you want incoming calls to ring through to the
handsets.
Try to re-power the handset.
Make sure that the current time is correct, and that
business hours/non-business hours are set correctly.