Polycom 1725-31424-001 - Manual (Page 12)

Deployment Guide for the Polycom CX700 IP Phone
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Although the actual operations of these two providers are closely related, they
appear independent to the time service. By default, when a computer that is
running Windows Server 2003 is connected to a network, it is configured as an
NTP client.
The Polycom CX700 phone searches for a NTP server in DNS as follows:
• NTP SRV record (UDP port 123)
— _ntp._udp.<SIP domain> pointing to NTP server
If it cannot find the NTP SRV record, it will try to use windows.com as an NTP
server:
• NTP A record
— time.windows.com
To set Group Policy for Windows Time Service global configuration settings:
1. From the MMC, click Active Directory Users and Computers.
2. Right-click the domain that contains the NTP server, and then select
Properties.
3. Click the Group Policy tab, make sure that the Default Domain Policy is
highlighted, and then click Edit.
4. Click Computer Configuration, click Administrative Templates, click
System, and then click Windows Time Service.
5. Click Time Providers and in the right pane, double-click Enable
Windows NTP Server, select the Enabled button, and then click OK.
6. From the Group Policy Object Editor menu, select File, and then click
Exit.
Server Security Framework Overview
The following section summarizes the elements that form the security
framework for Microsoft Office Communications Server 2007 R2. It is helpful
to understand how these elements work together when you deploy the
Polycom CX700 phone in your organization.
These security elements are as follows:
• Active Directory Domain Services (AD DS) provides a single trusted,
back-end repository for user accounts and network resources.
• PKI (Public Key Infrastructure) uses certificates that are issued by trusted
CAs (certificate authorities) to authenticate servers and to help ensure data
integrity.