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426 Features

Configuring the DHCP server to support full DHCP mode

The DHCP capability of the IP Phone enables the phone to receive

network configuration parameters and specific Connect Server parameters.

This section describes the IP Phone unique class identifier and requested

network configuration and Connect Server parameters for automatic

configuration.

IP Phone class identifier

The IP Phone is designed with a unique class identifier that the DHCP

server can use to identify the telephone. All Nortel IP Phones use the text

string Nortel-i2004-A or Nortel-i2004-B. The ASCII string is sent inside the

Class Identifier option of the IP Phone DHCP messages.

The DHCP server also includes the string in its responses to the IP Phone

DHCP client. This makes it possible to notify the IP Phone that the server

is IP Phone-aware, and that it is safe to accept the server’s offer. This

string appears in the beginning of a list of specific Call Server or TPS

information that the IP Phone DHCP client requests.

When the DHCP server is configured to recognize the IP Phone as a

special class, the DHCP server can treat the IP Phone differently than

other DHCP clients. DHCP host configuration parameters can then be

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 101 "IP Phone network configuration parameters" (page 427) 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

101 "IP Phone network configuration parameters" (page 427).

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010