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Network features 429

The following definition describes the Nortel-specific, encapsulated

IP Phone Vendor Specific Option for the Nortel-i2004-A string. For

information about the Nortel-i2004-B string, see “Automatic provisioning

using DHCP” (page 509). 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.

There are five types:

• 0x80 (Site Specific option 128)

•

0x90 (Site Specific option 144)

•

0x9d (Site Specific option 157)

•

0xbf (Site Specific option 191)

•

0xfb (Site Specific option 251)

The choice of five types enables the IP Phone to work one or more values

are already in use by a different vendor. Select one value for the Type

byte.

Length (1 octet) The Length value is variable. Count only the number of

octets in the data field. See “Data (variable number of octets)” (page 429) .

Data (variable number of octets) The Data field contains an

ASCII-encoded character string as follows:

Nortel-i2004-A,iii.jjj.kkk.lll:ppppp,aaa,rrr;

iii.jjj.kkk.lll:ppppp,aaa,rrr.

This string can be NULL-terminated, although the NULL is not required

for parsing.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010