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Network features 407

Full DHCP mode

When the Phase II IP Phone (IP Phone 2001, IP Phone 2002, and IP

Phone 2004), IP Audio Conference Phone 2033, or IP Softphone 2050

is configured to operate in full DHCP mode, the DHCP server requires

special configuration. The IP Phone obtains network configuration

parameters and Connect Server configuration parameters from

specially-configured DHCP servers.

The following parameters are provided for the primary and secondary

Connect Servers:

•

Connect Server IP address — for IP Line, the Connect Server IP

address is the IP Telephony node IP address.

• port number = 4100

•

command value = 1; identifies the request to the Connect Server

as originating from an In partial DHCP mode the Connect Server

parameters, node ID and Virtual TN must be entered manually.

•

retry count = 10 (typically)

The IP Telephony node ID and Virtual TN must always be configured

manually even in full DHCP mode.

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

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.02 26 May 2009