Cisco® Unified CallManager systems and gateways provide multiple ways to synchronize time. Using lab test results, this document compares the advantages of the two primary options, explains how to mitigate risks, and describes the benefits of synchronization with an external network time server such as the Symmetricom Network Time Protocol (NTP) SyncServer S200. The test findings also apply to other IP telephony platforms, such as Cisco Conference Connection, Cisco Customer Response Solutions, Cisco Unity® Voice Connector, Cisco Personal Assistant, and Cisco IP Phone Productivity Services (PPS).
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