System information

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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.

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.

The following definition describes the Nortel-specific, encapsulated IP

Phone Vendor Specific Option. This option must be encapsulated in a

DHCP vendor-specific option (refer to RFC 1533) and returned by the

DHCP server as part of each DHCPOFFER and DHCPACK message for

the IP Phone to accept these messages as valid. The IP Phone extracts

the relevant information from this option and uses it to configure the

Connect Server IP address, the port number (4100), a command value (1),

and the retry count for the primary and secondary Connect Servers.

Either this encapsulated Vendor Specific Option or a similarly encoded

site-specific option must be sent. The DHCP server must be configured

to send one or the other, but not both. The choice of using the

vendor-specific or the site-specific option is provided to enable Windows

NT DHCP servers to support the IP Phone. Windows NT servers do not

properly implement the Vendor Specific Option, and as a result, Windows

NT implementations must use the Site Specific version.

The format of the encapsulated Vendor Specific option is Type, Length,

and Data, described in the following sections.

Type (1 octet):

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.02 26 May 2009