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428 Features

The administrator must use one of the site-specific or vendor-encapsulated

option codes to implement the Call Server or TPS information. This

user-defined option can then be sent as-is, or encapsulated in a Vendor

Encapsulated option with Option Code 43. The method used depends on

the DHCP server’s capabilities and what options are already in use by

other vendors.

The IP Phone rejects any DHCPOFFER and DHCPACK messages that

do not contain the following options:

•

a router option — IP Phone requires a default gateway (router)

• a subnet mask option

•

a vendor-specific option or a site-specific option

The vendor-specific option code is 43. A Windows NT DHCP Server

(up to SR4) supports only 16 octets of data for the vendor-specific

option, which is insufficient to support the minimum length of the IP

Phone-specific string. If you use a Windows NT DHCP Server, select

the Site Specific option to accommodate the IP Phone-specific string.

The site-specific options are all DHCP options between 128 (0x80)

and 254 (0xFE). These options are reserved for site-specific use by

the DHCP RFCs.

ATTENTION

Phase 0 and Phase I IP Phones cannot accept a DHCPOFFER that contains a

list of OPTIONS larger than 312 bytes. If the total size of the DHCP OPTIONS is

larger than 312 bytes the Phase 0 and Phase I 1 IP Phones do not successfully

boot and register to the TPS.

ATTENTION

In an environment that combines IP Phones that support the Nortel-i2004-B

option with the Phase 0 IP Phone 2004, Phase 1 IP Phone 2002, or Phase 1 IP

Phone 2004, you must ensure one of the following:

• the Nortel-i2004-B option string does not exceed 590 bytes

•

the Phase 0 or Phase 1 IP Phones are serviced with a DHCPOFFER that

excludes the Nortel-i2004-B option

Format for IP Phone DHCP Class Identifier option All IP Phones fill

in the Class ID option of the DHCPDISCOVER and DHCPREQUEST

messages with the null-terminated, ASCII-encoded string Nortel-i2004-A

or Nortel-i-2004-B, where A or B identifies the version number of the

information format of the IP Phone.

The Class Identifier Nortel-i2004-A and Nortel-i-2004-B must be unique in

the DHCP server domain.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010