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408 Chapter 16: User Features
The call park feature works within a CUCM cluster. Each CUCM in a cluster must have its
own call park extension numbers defined, because the call park configuration is done on a
CUCM, not per cluster. Either a single directory number (DN) or a range of DNs can be
defined for use as call park extension numbers, up to 100 call park numbers per CUCM
cluster. call park numbers cannot overlap between CUCM servers.
CUCM can park only one call at each call park extension number.
Figure 16-1 shows how to use the Call Park feature, as follows:
1. The user on Phone A calls Phone B.
2. The user on Phone A wants to take the call in a conference room for privacy. The Phone
A user presses the Park softkey.
3. The CUCM server to which Phone A is registered sends the first available call park
number, which displays on Phone A. The user on Phone A watches the display for the
call park DN (so that he can dial that DN on Phone C).
4. The user on Phone A leaves the office and walks to an available conference room where
the phone is designated as Phone C. The user goes off-hook on Phone C and dials 1234
to retrieve the parked call.
5. The system establishes the call between Phones C and B.
The call park feature can also be used across CUCM clusters.
Figure 16-1 Call Park
CUCM
“1234”
A B
C
IP
IP 1 IP
2 Call Park
Sends Call Park
Code to Display
on Phone
3
Dial “1234” to
Pick Up Call
4
5
Initial Stream Call Park Code Final Stream
Call Park 409
The call park feature is configured by navigating to Call Routing > Call Park in CUCM
Administration. A maximum of 100 call park extension numbers can be provisioned per
CUCM cluster. Each CUCM server must have its own portion of call park numbers carved
out of the cluster wide maximum of 100 call park numbers. When a call gets parked,
CUCM chooses the next call park extension number that is available and displays that
number on the phone. The call park configuration is illustrated in Figure 16-2.
Figure 16-2 Call Park Configuration
Directed call park numbers can be configured in the CUCM Directed Call Park Configuration
window. Directed call park numbers exist cluster-wide. Phones that support the
directed call park Busy Lamp Field (BLF) can be configured to monitor the busy/idle status
of specific directed call park numbers. Users can also use the BLF to speed dial a directed
call park number. The directed call park feature enables users to point the call to a number
they use, whereas call park automatically assigns a DN.
CUCM can park only one call at each directed call park number. To retrieve a parked call,
a user must dial a configured retrieval prefix followed by the directed call park number at
which the call is parked. Configure the retrieval prefix in the Directed Call Park
Configuration window.
Figure 16-3 shows the directed call park process explained in the list that follows:
1. Users A and B connect in a call.
2. To park the call, A presses the Transfer softkey and dials the directed call park
number 80.
3. User A presses the Transfer softkey again to complete the directed call park transfer.
This action parks A2 on directed call park number 80.
4. Phone C dials the directed call park prefix (21) followed by the directed call park
number 80 to retrieve the call. After dialing the pattern of 2180, C connects to B.
5. If the call is not retrieved before expiration of the call park reversion timer configured
in the service parameter, the call reverts to the configured reversion number.
410 Chapter 16: User Features
Figure 16-3 Directed Call Park
Any phone that can perform a transfer can use directed call park. The directed call park
feature does not require special installation. To configure directed call park, define a unique
directed call park number or a range of directed call park numbers. 40XX configures a
range of directed call parks (4000 to 4099).
Directed call park is configured by navigating to Call Routing > Directed Call Park in
CUCM Administration. The directed call park configuration is illustrated in Figure 16-4.