System information

408 Features
grouped by class to supply only information relevant to the IP Phone
DHCP client, such as the Connect Server parameters. The administrator
can also design the network according to the client’s class, if necessary,
making maintenance easier.
Depending on the capabilities and limitations of the DHCP server used
and the design of the network, some of these advanced functions are not
available.
Requested network configuration parameters
In full DHCP mode, an IP Phone-aware DHCP server can automatically
configure Nortel IP Phones by requesting a list of Connect Server
configuration parameters. The IP Phone uses DHCP to request and
receive the information.
Table 91 "IP Phone network configuration parameters" (page 408) lists
the network configuration parameters requested by the IP Phone in the
Parameter Request List option (Option Code 55) in the DHCPDISCOVER
and DHCPREQUEST messages. The DHCPOFFER and the DHCPACK
reply messages from the DHCP server must contain the options in Table
91 "IP Phone network configuration parameters" (page 408).
Table 91
IP Phone network configuration parameters
Parameters requested by IP Phone
(Option Code 55)
DHCP server
response: Option
Code
Subnet mask — the client IP subnet mask
1
Router/gateway(s) — the client default gateway IP
address (not required in DHCPOFFER in IP Phone
Firmware 1.25 and later for compatibility with Novell
DHCP server)
3
DNS Server IP
6
DNS domain
15
Lease time — implementation varies according to
DHCP server
51
Renewal time — implementation varies according to
DHCP server
58
Rebinding interval — implementation varies according
to DHCP server
59
TFTP Server Name
66
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368 05.02 26 May 2009
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