Cisco Unified Communications Manager Administration Guide, Release 8.6(1)
Phone NTP Reference Configuration
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Phone NTP Reference Configuration

Table Of Contents

Phone NTP Reference Configuration

Phone NTP Reference Configuration Settings

Related Topics


Phone NTP Reference Configuration


Use the following topics to configure phone NTP references:

Phone NTP Reference Configuration Settings

Related Topics

Phone NTP Reference Configuration Settings

In Cisco Unified Communications Manager Administration, use the System > Phone NTP Reference menu path to configure phone NTP references.

If you want to do so, you can configure phone Network Time Protocol (NTP) references in Cisco Unified Communications Manager Administration to ensure that a phone that is running SIP gets its date and time from the NTP server. If all NTP servers do not respond, the phone that is running SIP uses the date header in the 200 OK response to the REGISTER message for the date and time.

After you add the phone NTP reference to Cisco Unified Communications Manager Administration, you must add it to a date/time group. In the date/time group, you prioritize the phone NTP references, starting with the first server that you want the phone to contact.

The date/time group configuration gets specified in the device pool, and the device pool gets specified on the phone page.

Tips About Configuring Phone NTP References

After you add a new phone NTP reference to the Cisco Unified Communications Manager database, assign it to a date/time group. For more information, see the "Date/Time Group Configuration Settings" section.

Tips About Deleting Phone NTP References

Before you can delete the phone NTP reference from Cisco Unified Communications Manager Administration, you must delete the phone NTP reference from the date/time group. To find which date/time groups use the phone NTP reference, choose Dependency Records from the Related Links drop-down list box in the Phone NTP Reference Configuration window and click Go. When you know which date/time groups use the phone NTP reference, you can then remove that phone NTP reference from that group.

If the dependency records feature is not enabled for the system, the dependency records summary window displays a message that shows the action that you can take to enable the dependency records; the message also displays information about high CPU consumption that is related to the dependency records feature. For more information about dependency records, see the "Accessing Dependency Records" section.

Using the GUI

For instructions on how to use the Cisco Unified Communications Manager Administration Graphical User Interface (GUI) to find, delete, configure, or copy records, see the "Navigating the Cisco Unified Communications Manager Administration Application" section and its subsections, which explain how to use the GUI and detail the functions of the buttons and icons.

Configuration Settings Table

Table 5-1 describes the phone NTP reference configuration settings. For related procedures, see the "Related Topics" section.

Table 5-1 Phone NTP Reference Configuration Settings 

Field
Description

IP Address

Enter the IP address of the NTP server that you want the phone that is running SIP to use to get its date and time.

Note Cisco Unified Communications Manager cannot be configured as Phone NTP References.

Description

Enter a description for the phone NTP reference. Cisco Unified Communications Manager Administration automatically propagates the information in the IP Address field to the Description field. If you want to do so, you can change the information.

Mode

From the drop-down list box, choose the mode for the phone NTP reference. The values from which you can choose follow:

Directed Broadcast—If you choose this default NTP mode, the phone accesses date/time information from any NTP server but gives the listed NTP servers (1st = primary, 2nd = secondary) priority. For example, if the phone configuration contains NTP servers where A = primary NTP server and B = secondary/backup NTP server, the phone uses the broadcast packets (derives the date/time) from NTP server A. If NTP server A is not broadcasting, the phone accesses date/time information from NTP server B. If neither NTP server is broadcasting, the phone accesses date/time information from any other NTP server. If no other NTP server is broadcasting, the phone will derive the date/time from the Cisco Unified Communications Manager 200 OK response to the REGISTER message.

Unicast—If you choose this mode, the phone will send an NTP query packet to that particular NTP server. If the phone gets no response, the phone will access date/time information from any other NTP server. If no other NTP servers respond, the phone will derive the date/time from the Cisco Unified Communications Manager 200 OK response to the REGISTER message.

Note Cisco Unified Communications Manager currently does not support the Multicast and Anycast modes. If you choose either of these modes, Cisco Unified Communications Manager will default to the Directed Broadcast mode.


Additional Information

See the "Related Topics" section.

Related Topics

Phone NTP Reference Configuration

Phone NTP Reference Configuration Settings

Date/Time Group Configuration Settings