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30 Planning
Figure 2
Sample DHCP reservation showing assigned parameters
Another use for the DHCP server is to make code upgrades to the handset
easier. To prevent handsets from checking for code upgrades, assign the
value of 255.255.255.255 for the TFTP server address.
A problem can arise for handset users who travel. For example, the
company employing the handset solution is a retailer with many stores.
Each store has a local call server for the local employees who use various
VoIP devices, so all the attributes are defined at the scope level. What
happens if supervisors, who travel from store to store, want to use their
handsets at each location? The supervisors can be assigned to a signaling
server that does not recognize their phones. The best way to support
these users is to create unique reservations in each remote scope for
each user’s WLAN handset and specify the proper signaling server. This
solution can be cumbersome if there are a large number of users who
travel.
TFTP Server planning
A TFTP Server (RFC1350) holds the software images for updating the
handsets and the WLAN IP Telephony Manager 2245. After the IP
address of the TFTP server is configured on a wireless handset, each
time the wireless handset is powered on, the wireless handset checks
its version of firmware against the firmware on the TFTP Server, and if
the version is different, the wireless handset downloads the new firmware
from the TFTP Server. Similarly, when a WLAN IP Telephony Manager
2245 reboots, or is manually reset by the operator, it checks its version
of software against the version on the TFTP Server. If the versions are
different, the WLAN IP Telephony Manager 2245 downloads the new
software.
The WLAN Handsets 2210/2211/2212 and WLAN Handsets 6120/6140
share the same configuration file that provides firmware version
information for the TFTP process. The actual software files are specific to
either the WLAN Handset 2200 series or the WLAN Handset 6100 series.
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.