SIP User's Manual
620
Document #: LTRT-12804
Mediant 800 MSBG
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 uses is configurable using the
ini
file parameter NTPServerUTCOffset, or via an
SNMP MIB object (refer to the
Product Reference Manual
).
If required, the clock update is performed by the client as the final step of the update
process. The update is performed 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 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.
9.5
Network Configuration
The device allows you to configure up to 12 different IP addresses with associated VLANs
for the VoIP network, using the Multiple Interface table. Complementing this table is the
Routing table, which allows you to define VoIP network static routing rules for non-local
hosts/subnets. This section describes the various network configuration options offered by
the device.
This section covers the VoIP network configuration (interfaces, static routing rules, and
QoS definitions). For configuring the data-routing network (interfaces, routing, firewall,
NAT, etc.), see Data Settings on page
9.5.1
Multiple Network Interfaces and VLANs
A need often arises to have logically separated network segments for various applications
(for administrative and security reasons). This can be achieved by employing Layer-2
VLANs and Layer-3 subnets.
Figure
9-1: Multiple Network Interfaces
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