Aastra Telecom 9480i Series - Manual (Page 423)

Operational Features
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Configuring Operational Features
Note: If the "Do Not Disturb" (DND) or the "Call Forward" (CFWD)
feature is enabled on the server-side, and the user is still waiting for a call,
the "Bellcore-dr5" is a ring splash tone that reminds the user that these are
enabled.
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