Avaya 9608 - Administering the DHCP Server; Configuring DHCP Option 242 (SSON)

Administering DHCP and HTTP servers
44 Administering Avaya 9601/9608/9608G/9611G/9621G/9641G IP Deskphones SIP
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the deskphone does not search for a DHCP server unless the static IP address is,
subsequently, unassigned manually.
Since manual entry of an IP address is an error-prone process, you must ensure the following:
● A minimum of two DHCP servers are available for reliability.
● A DHCP server is available when the IP deskphone reboots.
● A DHCP server is available at remote sites if WAN failures isolate IP deskphones from the
central site DHCP servers.
A file server, HTTP or HTTPS, provides the deskphone with an upgrade file and, if appropriate,
new or updated binary software. See
Step 3: Downloading files on page 21. You can further edit
the 46xxsettings.txt settings file to customize the deskphone parameters for your specific
environment. For more information, see
Chapter 7: Administering deskphone options.
Administering the DHCP Server
This section concentrates on the simplest case of a single LAN segment. You can use the
information provided here as a basis for more complex LAN configurations.
!
CAUTION:
CAUTION: Before you start, understand your current network configuration. An improper
installation will cause network failures or reduce the reliability and performance of
your network.
Configuring DHCP Option 242 (SSON)
For SIP-based 9600 Series IP Deskphones, you can specify the value of some configuration
parameters using DHCP option 242, the default site-specific option. If you have 46xx phones
that use option 176, you can make a copy of an existing option 176. Then, using that copy to
administer DHCP option 242, you can either:
● Leave any parameters or that of 46xx phones that the 9600 series SIP IP deskphones do
not support in Option 242, or
● Delete unused or unsupported 9600 IP series deskphone parameters to shorten the
DHCP message length.
You can set the following parameters in the DHCP site-specific option for 96xx deskphones,
although most of them can be set in the 46xxsettings.txt settings file as well, as described in .