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Basic Rate Interface (BRI) Feature

Considerations and Constraints

A Directory Number (DN) is busy when no extension is available to answer or cover the call. An extension may be unavailable when one of the following conditions applies: no SA button (aside from Originate Only buttons) is available; Do Not Disturb is activated; the extension is being programmed; the extension is forced idle; or the extension alarm clock is being set. The caller hears a busy tone, or the call receives coverage, if programmed.

For BRI lines, the SMDR format should be set to ISDN format.

With the SMDR Talk Time option enabled, call timing for incoming calls to Auto Logout or Auto Logout Calling Groups begins when the system detects the call.

Topics
	Description
	Terminology Clock Synchronization Clock Switching Timers and Counters Call Processing
	At a Glance
	Considerations & Constraints
	System Programming
	Feature Interactions