How the System Receives Time
The IP Office control unit contains a battery backed clock which is used to maintain system time during normal operation and when mains power is removed. The time is obtained using Time protocol (RFC868) requests. Note that this is different from Network Time Protocol (NTP).
Following a reboot the IP Office control unit sends out a time request on its LAN1 interface. It first makes the request to the Voicemail Server IP address in its configuration and, if it receives no reply, then makes a broadcast request.
The Voicemail Lite Server, Voicemail Pro Server/Service and the Manager program can all act as Time servers, giving the time as set on their host PC's. If you are running Manager when the Voicemail Server starts, then Voicemail does not start as a time server. It is therefore highly recommended that you have no copy of Manager running when you start or restart the Voicemail Server.
A specific address for the time server that should be used can be set in the IP Office configuration (System | System | Time Server IP Address). Setting this address to 0.0.0.1 also disables the IP Office's time update requests.
When using a time server located in a different time zone from the IP Office, there are two mechanisms for applying an offset to the time. If Manager is acting as the time server, the time offset for each can be specified through the BOOTP entry for the system. Alternatively, the offset can specified in the IP Office configuration (System | System | Time Offset).