User`s manual

MediaPack SIP User’s Manual 9. Networking Capabilities
Version 4.6 195 June 2005
restarted. The NTP server identity (as an IP address) and the update interval are configurable
parameters that can be specified either in the ini file (NTPServerIP, NTPUpdateInterval
respectively) or via an SNMP MIB object.
When the client receives a response to its request from the identified NTP server it must be
interpreted based on time zone, or location, offset that the system is to a standard point of
reference called the Universal Time Coordinate (UTC). The time offset that the NTP client should
use is a configurable parameter that can be specified either in the ini file (NTPServerUTCOffset)
or via an SNMP MIB object.
If required, the clock update is performed by the client as the final step of the update process.
The update is done in such a way as to be transparent to the end users. For instance, the
response of the server may indicate that the clock is running too fast on the client. The client
slowly robs bits from the clock counter in order to update the clock to the correct time. If the clock
is running too slow, then in an effort to catch the clock up, bits are added to the counter, causing
the clock to update quicker and catch up to the correct time. The advantage of this method is that
it does not introduce any disparity in the system time, that is noticeable to an end user, or that
could corrupt call timeouts and timestamps.