Startup
A31003-O1010-M100-17-76A9, 09/09/2010
2-10
OpenScape Voice - OpenStage Family, Administration Manual
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Quick Start
2.3.4
DHCP Resilience (V2R1)
With firmware version V2R1, it is possible to sustain network connectivity in case of DHCP
server failure. If
DHCP lease reuse
is activated, the phone will keep its DHCP-based IP ad-
dress even if the lease expires. To prevent address conflicts, the phone will send ARP requests
in 5 second intervals. Additionally, it will send discovery messages periodically to obtain a new
DHCP lease.
2.3.5
Date and Time / SNTP
An SNTP (Simple Network Time Protocol) server provides the current date and time for net-
work clients. The IP address of an SNTP server can be given by DHCP.
In order to provide the correct time, it is required to give the timezone offset, i.e. the shift in
hours to be added to the UTC time provided by the SNTP server.
The following DHCP options are required:
•
SNTP IP Address (option #42 "NTP Servers")
: IP Address or hostname of the SNTP
server to be used by the phone.
•
Timezone offset (option #2 "Time Offset")
: Offset in seconds in relationship to the UTC
time provided by the SNTP server.
For manual configuration of date and time see Section 3.5.4, “Date and Time”.