In versions earlier
than Cisco Unified CME 7.1, BLF monitoring does not provide notification of
status changes when a monitored directory number becomes DND-enabled, and the
Busy Lamp Field (BLF) indicators for directory numbers configured as call-park
slots, paging numbers, or ad hoc or meet-me conference numbers display only the
Cisco Unified CME 7.1 and later versions support idle, in-use,
and unknown BLF status indicators for monitored ephone-dns configured as
call-park slots, paging numbers, and ad hoc or meet-me conference numbers. This
allows an administrator (watcher) to monitor a call-park slot to see if calls
are parked and not yet retrieved, which paging number is available for paging,
or which conference number is available for a conference.
configured as a park-slot is not registered with any phone. In
Cisco Unified CME 7.1 and later versions, if a monitored park-slot is idle, the
BLF status shows idle on the watcher. If there is a call parked on the
monitored park-slot, the BLF status indicates in-use. If the monitored
park-slot is not enabled for BLF monitoring with the
command, the BLF indicator for unknown status displays on the watcher.
configured for paging or conferencing is also not registered with any phone.
The indicators for the idle, in-use, and unknown BLF status are displayed for
the monitored paging number and ad hoc or meet-me conference numbers, as with
the call-park slots.
Cisco Unified CME 7.1 and later versions support the Do Not
Disturb (DnD) BLF status indicator for ephone-dns in the DnD state. When a user
presses the DnD softkey on an SCCP phone, all directory numbers assigned to the
phone become DnD-enabled and a silent-ring is played for all calls to any
directory number on the phone. If a monitored ephone-dn becomes DnD-enabled,
the corresponding BLF speed-dial lamp (if available) on the watcher displays
solid red with the DnD icon for both the idle and in-use BLF status.
The BLF status
notification occurs if the monitored ephone-dn is:
directory number on only one SCCP phone
number that is not shared
directory number and all associated phones are DnD-enabled
No new configuration
is required to support these enhancements. For information on configuring BLF
monitoring of directory numbers, see
Monitoring for Speed-Dials and Call Lists.
compares the different BLF monitoring features that can be configured in
Cisco Unified CME.
Table 1. Feature
Comparison of Directory Number BLF Monitoring
single ephone-dn instance.
If there are
multiple ephone-dns with the same extension (such as in an overlay), this mode
watches only a single ephone-dn (specified with the
indicate DND state of the phone.
activity on the phone for which the designated ephone-dn is the primary
ephone-dn is “primary” for a phone if the extension appears on button 1 or on
the button indicated by the
can be shared but cannot be the primary extension on any other phone.
DND state of the phone.
SCCP and SIP
ephone-dn instances with the same (primary) extension number. The BLF lamp is
on if any instance of the monitored extension is in use.
DND state of the phone.
distinguish which phone is using the ephone-dn if the DN is shared across
cases where ephone-dns are shared across multiple phones.
must have a unique primary ephone-dn.
indicate that a specific phone is in use as opposed (button m) to indicating
that a specific ephone-dn is in use.
distinguish which phone is using the ephone-dn, if the DN is shared across
Local vs. Remote
only DNs on the local Cisco Unified CME system.
monitor DNs that are on the local Cisco Unified CME system
extension numbers on a remote Cisco Unified CME using SIP Subscribe and Notify.
Cannot monitor local and remote at the same time.