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Two types of settings parameters can be changed in CUCM globally across a server or
globally across the cluster: enterprise parameters and service parameters.
Enterprise Parameters
Enterprise parameters are used to define cluster-wide system settings, and they apply to all
devices and services in the cluster. After installation, enterprise parameter default values
should be verified and modified if required before deploying endpoints. Some enterprise
parameters will specify initial values of device defaults.
CAUTION Only change enterprise parameters if you are fully aware of the impact of
your modifications or if instructed to do so by Cisco Technical Assistance Center (TAC).
Network and Feature Services 101
Figure 5-10 Control Center
You can modify many enterprise parameters. Table 5-3 displays some frequently modified
enterprise parameters.
Table 5-3 Enterprise Parameters
Parameter Description Default Value
Auto Registration Phone
Protocol
Specifies the protocol that autoregistered
phones should boot
with during initialization
SCCP
Enable Dependency Records Determines whether to display
dependency records
False
continues
Activation status
Current status Service start time and up time
Start, stop, restart, refresh
selected service
Select service to
start, stop, or restart
102 Chapter 5: Initial Configuration Settings
Dependency records are a feature of CUCM that enable an administrator to view
configuration database records that reference the currently displayed record. Dependency
record reports can be run by using the Related Links drop-down menu in most configuration
pages throughout CUCM Administration. Dependency record reports search the database
and return links to all configuration items that include the configuration detail in question.
Dependency record reports are useful when CUCM will not allow a configuration element
to be deleted because it is in use somewhere in the system but should no longer be in use.
Because dependency records could cause a CPU spike in the server platform, it is not
recommended that they be run during high-usage periods.
To modify enterprise parameters, follow these steps in the CUCM Administration web
interface:
Step 1 Navigate to System > Enterprise Parameters.
Step 2 Change the enterprise parameter values as desired and save the changes.
Figure 5-11 shows the procedure to hide configuration elements from the CCMUser
configuration pages. A business might not want end users to be able to change the Call
CCMUser Parameters Display or hide certain userconfigurable
settings from the
CCMUser web page
Not applicable
Phone URL Parameters URLs for IP phone
authentication, Directory
button, Services button, and
so on
Hostnames rather than IP
addresses
User Search Limit Specifies the maximum number
of users to be retrieved from a
search in the Corporate
Directory feature on the phone
64
NOTE To obtain additional information about specific enterprise parameters, click the
? symbol in the upper-right corner of the screen. The same help system is available by
clicking the hyperlink of the enterprise parameter name.
Table 5-3 Enterprise Parameters (Continued)
Parameter Description Default Value
Network and Feature Services 103
Forward All options of their phone in the CCMUser configuration pages, but the option
exists in the page by default. Using the enterprise parameter options shown in Figure 5-11,
the administrator can choose to remove the hyperlink to Call Forward All in the CCMUser
section of the Enterprise Parameters Configuration page. All default settings appear on the
right side of the Enterprise Parameter Configurations page.
Figure 5-11 Enterprise Parameter Configuration
When you are removing DNS reliance, all hostnames within enterprise URL parameters
have to be changed to IP addresses. Phone URL parameters change the website that the
phone launches when the settings, services, or directories buttons are clicked on the Cisco
IP Phone. The phone URL parameters are part of the enterprise parameters. Figure 5-12
shows the configuration of the phone URL parameters.
1. Select the new setting Default setting
2. Save the changes
104 Chapter 5: Initial Configuration Settings
Figure 5-12 Phone URL Parameters
Service Parameters
Service parameters are used to define settings for a specific service (for example, the callprocessing
CallManager service). They can be configured separately for each server in
the cluster. After installation (or activation of feature services), service parameter default
values should be verified and modified if required, before deploying endpoints. The most
important service parameters for the CallManager service are as follows:
■ T302 timer: The T.303 interdigit timeout specifies the interdigit timeout value used to
route calls when there are multiple possible matches in the database. Multiple possible
matches is a condition that will exist when variable-length numbers (international) or
overlapping dial plans are being analyzed by CUCM. Reducing the default T.302 value
will accelerate the call-routing decision of CUCM when users dial international phone
numbers or a phone number that overlaps with another. The default T.302 timer is
15,000-ms (15 seconds). A value of 15 seconds is too long for most environments. Best
practice is to reconfigure this timer to a value of 5000 ms (5 seconds). An example of
an overlapping dial plan is extension 1500 and extension 15001. CUCM would not
know whether it was done receiving digits if the digits of 1500 were received. The user
might dial another 1, which would direct the call to a different extension. In this situation,
CUCM waits for the T.302 timer to expire and then extends the call to extension 1500.
Network and Feature Services 105
■ CDR and CMR: CDRs are the basis for call reporting, accounting, and billing. The
service parameters are used to enable CDRs and CMRs. CMRs report QoS information
related to the phone call (lost packets, average jitter, maximum jitter, and so forth).
■ Cisco Unified Extension Mobility maximum login time: After expiration of this
timer, a user is logged out of Cisco Unified Extension Mobility.
■ Cisco Unified Attendant Console username: Specifies the application username that
is used by the Cisco Unified Attendant Console application when logging in to the
CUCM Computer Telephony Integration (CTI) interface.
By default, not all service parameters display. To see the complete list of service parameters,
click the Advanced button. The Change B-Channel Maintenance Status service parameter
is an example of a CallManager service parameter that does not show by default. Table 5-4
includes some frequently modified service parameters. Hundreds of service parameters are
available to CUCM, many of which you will never encounter. The best way to find one of
the parameters listed in Table 5-4 is to use the Find function of your web browser to locate
the option on the page.
Table 5-4 Service Parameter Examples
Parameter Description Default Value
CDR Enabled Flag This parameter determines whether CDRs are
generated.
False
Station Keepalive Interval This parameter designates the interval between
keepalive messages sent from Cisco IP Phones to the
primary CUCM.
30 seconds
T302 Timer This parameter specifies an interdigit timer for
sending the setup acknowledgment message. When
this timer expires, CUCM routes the dialed digits.
15 seconds
Automated Alternate
Routing Enable
This parameter determines whether to use automated
alternate routing when the system does not have
enough bandwidth.
False
Change B-Channel
Maintenance Status (click
Advanced button first)
This parameter allows CUCM to change individual B
channel maintenance status for PRI and CAS
interfaces in real time for troubleshooting.
No default
106 Chapter 5: Initial Configuration Settings
To modify service parameters, follow these steps in the CUCM Administration web
interface:
Step 1 Navigate to System > Service Parameters.
Step 2 Select the server and the service for which you want to change service
parameters.
Step 3 Change the service parameter values as desired and save the changes.
Step 4 Click Save.
Steps 2 through 4 are illustrated in Figures 5-13 and 5-14.