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For certain call types (such as fax, modem or transparent data), it is important for both ends to keep time with each other. To make sure a number of gateways are always in sync, you may configure a common clock source here. For this to work well, you should use a device as clock source that has a stable clock itself, e.g. a gateway that is synchronized to a public ISDN interface. Also, make sure the Interval is sufficiently short (that is, you should keep the default of 1 second).

You can use just any NTP server with a stable clock as clock source.

This clock source is not used to set the system time, use the NTP Configuration for this.


Sync Server IP address of clock source
Interval Polling interval in seconds
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