Cisco Unified Communications Manager enables you to configure the following
features for directory numbers: call waiting and call forward.
For information about features that relate to phones, see
The following features get configured for phones: barge, privacy release, call
back, call park, call pickup, immediate divert, malicious call identification,
quality report tool, service URL, and speed dial and abbreviated dial
Call forward allows a user to configure a
Cisco Unified IP Phone, so all calls that are destined for it ring another phone. The
following types of call forward exist:
Call forward all-Forwards all calls.
Call forward busy-Forwards calls only when the line is in use and
busy trigger setting is reached.
Call forward no answer-Forwards calls when the phone is not
answered after the configured no answer ring duration, or if the destination is
Call forward no coverage-Forwards calls when call either exhausts
or times out, and the associated hunt-pilot for coverage specifies Use Personal
Preferences for its final forwarding.
You can configure each call forward type for internal and
external calls that can be forwarded to voice-messaging system, dialed
destination number, or calling search space.
Cisco Unified Communications Manager supports a secondary Calling Search
Space (CSS) for Call Forward All (CFA) field. The secondary CSS for CFA
combines with the existing CSS for CFA to allow the support of the alternate
CSS system configuration. When CFA is activated, only the primary and secondary
CSS for CFA get used to validate the CFA destination and redirect the call to
the CFA destination. If these fields are empty, the null CSS gets used. The
combination of the line CSS and device CSS no longer gets used when the CSS for
CFA is None. Only the CSS fields that are configured in the primary CSS for CFA
and secondary CSS for CFA fields get used. If CFA is activated from the phone,
the CFA destination gets validated by using the CSS for CFA and the secondary
CSS for CFA, and the CFA destination gets written to the database. When the CFA
is activated, the CFA destination always gets validated against the CSS for CFA
and the secondary CSS for CFA.
The administrator can configure call-forward information
display options to the original dialed number or the redirected dialed number
or both. The administrator can enable or disable the calling line ID (CLID) and
calling name ID (CNID). The display option gets configured for each line
The call forward busy trigger gets configured for each line
appearance and cannot exceed the maximum number of calls that are configured
for a line appearance. The call forward busy trigger determines how many active
calls exist on a line before the call forward busy setting gets activated (for
example, 10 calls).
The call forward no answer ring duration gets configured for
each line appearance, and the default specifies 12 seconds. The call forward no
answer ring duration determines how long a phone rings before the call forward
no answer setting gets activated.
Keep the busy trigger slightly lower than the maximum number of
calls, so users can make outgoing calls and perform transfers.
Configure call forward in the Directory Number Configuration
Cisco Unified Communications Manager Administration.
Cisco Unified Communications Manager provides a service parameter (CFA
Destination Override) that allows the administrator to override Call Forward
All (CFA) when the target of the CFA calls the initiator of the CFA, so the CFA
target can reach the initiator for important calls. In other words, when the
user to whom calls are being forwarded (the target) calls the user whose calls
are being forwarded (the initiator), the phone of the initiator rings instead
of call forwarding back to the target. The override works whether the CFA
target phone number is internal or external.
When the CFA Destination Override service parameter is set
to False (the default value), no override occurs. Ensure the service parameter
is set to True for CFA override to work.
CFA override only takes place if the CFA destination matches the
calling party and the CFA Destination Override service parameter is set to
True. If the service parameter is set to True and the calling party does not
match the CFA destination, CFA override does not take place, and the CFA
remains in effect.
Call waiting lets users receive a second incoming call on
the same line without disconnecting the first call. When the second call
arrives, the user receives a brief call-waiting indicator tone, which is
configured with the Ring Setting (Phone Active) in the Directory Number
Configure call waiting in the Directory Number Configuration
Cisco Unified Communications Manager Administration by setting the busy trigger
(greater than 2) and maximum number of calls.
To configure call waiting for phones with no display (such as the
Cisco IP Phone 30 VIP), set the busy trigger to 2 and the maximum number of
calls to 2.
The user can invoke the Cancel Call Waiting feature, which enables
the user to block the operation of call waiting for one call. During this call,
the Call Waiting service is rendered inactive, so that anyone calling the user
receives the normal busy treatment, and no call waiting tones interrupt the
call. For more information on the cancel call waiting feature, see the
Cancel Call Waiting.