Time synchronization
From Zenitel Wiki
Synchronizing using a NTP server on the IP network
The AlphaCom can syncronize its real time clock with Network Time Protocol (NTP) time servers on the IP network. In AlphaWeb you need to define the IP address of the NTP server.
If your AlphaCom is connected to the internet, you'll find a list of NTP servers here: http://support.microsoft.com/kb/262680
Synchronizing using GPS network
The AlphaCom can syncronize its real time clock with a Master Clock which receives its time from GPS (Global Positioning System) satelittes.