Cisco Unified Communications Manager Administration Guide, Release 6.1(1)
Phone NTP Reference Configuration
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Phone NTP Reference Configuration

Table Of Contents

Phone NTP Reference Configuration

Finding the Phone NTP References

Configuring the Phone NTP References

Phone NTP Reference Configuration Settings

Deleting the Phone NTP Reference

Related Topics


Phone NTP Reference Configuration


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 SIP Phone gets its date and time from the NTP server. If all NTP servers do not respond, the SIP phone 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.

Use the following topics to configure phone NTP references:

Finding the Phone NTP References

Configuring the Phone NTP References

Phone NTP Reference Configuration Settings

Deleting the Phone NTP Reference

Finding the Phone NTP References

Because you can configure several phone NTP references in Cisco Unified Communications Manager Administration, Cisco Unified Communications Manager Administration allows you to locate specific phone NTP references. Use the following procedure to locate the phone NTP references that exist in Cisco Unified Communications Manager Administration.


Note During your work in a browser session, the cookies on the client machine store your find/list preferences. If you navigate to other menu items and return to this menu item, or if you close the browser and then reopen a new browser window, the system retains your Cisco Unified Communications Manager search preferences until you modify your search.


Procedure


Step 1 Choose System > Phone NTP Reference.

The Find and List Phone NTP References window displays. Records from an active (prior) query may also display in the window.

Step 2 To find all records in the database, ensure the dialog box is empty; go to Step 3.

To filter or search records

From the first drop-down list box, select a search parameter.

From the second drop-down list box, select a search pattern.

Specify the appropriate search text, if applicable.


Note To add additional search criteria, click the + button. When you add criteria, the system searches for a record that matches all criteria that you specify. To remove criteria, click the - button to remove the last added criterion or click the Clear Filter button to remove all added search criteria.


Step 3 Click Find.

All matching records display. You can change the number of items that display on each page by choosing a different value from the Rows per Page drop-down list box.


Note You can delete multiple records from the database by checking the check boxes next to the appropriate record and clicking Delete Selected. You can delete all configurable records for this selection by clicking Select All and then clicking Delete Selected.


Step 4 From the list of records that display, click the link for the record that you want to view.


Note To reverse the sort order, click the up or down arrow, if available, in the list header.


The window displays the item that you choose.


Additional Information

See the "Related Topics" section.

Configuring the Phone NTP References

This section describes how to add a phone NTP reference to the Cisco Unified Communications Manager database or to update a phone NTP reference that exists in the database.

Procedure


Step 1 Choose System > Phone NTP Reference.

The Find and List window displays.

Step 2 Perform one of the following tasks:

To add the phone NTP reference to the Cisco Unified Communications Manager database, click the Add New button and continue with Step 3.

To update an existing phone NTP reference, locate the existing phone NTP reference as described in the "Finding the Phone NTP References" section and continue with Step 3.

Step 3 Enter the appropriate settings as described in Table 5-1.

Step 4 To save the configuration in the database, click the Save icon that displays in the tool bar in the upper, left corner of the window (or click the Save button that displays at the bottom of the window).


Next Steps

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, refer to the "Configuring a Date/Time Group" section on page 6-3.

Additional Information

See the "Related Topics" section.

Phone NTP Reference Configuration Settings

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 SIP phone 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.



Deleting the Phone NTP Reference

This section describes how to delete a phone NTP reference from the Cisco Unified Communications Manager database.

Before You Begin

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, refer to the "Accessing Dependency Records" section on page A-2.

Procedure


Step 1 By using the procedure in the "Finding the Phone NTP References" section, find the phone NTP reference.

Step 2 To delete multiple phone NTP references, check the check boxes next to the appropriate phone NTP references in the Find and List window; then, click the Delete Selected icon or the Delete Selected button.

Step 3 To delete a single phone NTP reference, perform one of the following tasks:

In the Find and List window, check the check box next to the appropriate phone NTP reference; then, click the Delete Selected icon or the Delete Selected button.

In the Find and List window, click the Name link for the phone NTP reference. After the Phone NTP Reference Configuration window for that specific phone NTP reference displays, click the Delete Selected icon or the Delete Selected button.

Step 4 When prompted to confirm the delete operation, click OK to delete or Cancel to cancel the delete operation.


Additional Information

See the "Related Topics" section.

Related Topics

Phone NTP Reference Configuration

Finding the Phone NTP References

Configuring the Phone NTP References

Phone NTP Reference Configuration Settings

Deleting the Phone NTP Reference

Finding a Date/Time Group, page 6-1

Configuring a Date/Time Group, page 6-3

Date/Time Group Configuration Settings, page 6-4

Deleting a Date/Time Group, page 6-5