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64-11
Cisco Unified Communications Manager Administration Guide
OL-18611-01
Chapter 64 Directory Number Configuration
Directory Number Configuration Settings
Forward Busy External The settings in this row of fields specify the forwarding treatment for external calls to this
directory number if the directory number is busy. See
Busy Trigger, page 64-22 for
information on when a line is considered busy. The call forward destination and Calling
Search Space field get used to redirect the call to the forward destination.
Specify the following values:
• Voice Mail—Check this check box to use settings in the Voice Mail Profile Configuration
window for external calls.
Note When this check box is checked, the calling search space of the voice mail pilot gets
used. Cisco Unified Communications Manager ignores the settings in the Destination
box and Calling Search Space.
Note When the Voice Mail check box is checked for internal calls, the system automatically
checks the Voice Mail check box for external calls. If you do not want external calls
to forward to the voice-messaging system, you must uncheck the Voice Mail check box
for external calls.
• Destination—This setting indicates the call forward busy destination for external calls.
Use any dialable phone number, including an outside destination.
Note When you enter a destination value for internal calls, the system automatically copies
this value to the Destination field for external calls. If you want external calls to
forward to a different destination, you must enter a different value in the Destination
field for external calls.
• Calling Search Space—The Forward Busy external Calling Search Space is used to
forward the call to the Forward Busy External destination. It applies to all devices that are
using this directory number.
Note If the system is using partitions and calling search spaces, Cisco recommends that you
configure the forward calling search spaces. When a call is forwarded or redirected to
the call forward destination, the configured call forward calling search space gets used
to forward the call. If the forward calling search space is None, the forward operation
may fail if the system is using partitions and calling search spaces. For example, if you
configure the Forward Busy Destination, you should also configure the Forward Busy
Calling Search Space. If you do not configure the Forward Busy Calling Search Space
and the Forward Busy destination is in a partition, the forward operation may fail.
Note When you choose a Calling Search Space for internal calls, the system automatically
copies this setting to the Calling Search Space setting for external calls. If you want
external calls to forward to a different calling search space, you must choose a
different setting in the Calling Search Space drop-down list box.
Table 64-1 Directory Number Configuration Settings (continued)
Field Description