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802.1Q VLAN support is configured using the display interface of the IP

Phones during the initial configuration procedure of the IP Phone.

This method is based on the assumption that the default VLAN will be

the data VLAN and the tagged VLAN will be the voice VLAN. Enter the

voice VLAN information into the data VLAN and subnet’s DHCP server.

Enter the standard IP Phone configuration string into the voice VLAN and

subnet’s DHCP server pool.

The following definition describes the IP Phone 2004-specific, Site Specific

option. This option uses the "reserved for Site Specific use" DHCP options

(DHCP option values 128 to 254) and must be 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 and uses the information to configure itself.

Format of the field

The format of the field is: Type, Length, Data.

Type (1 octet):

There are five choices:

• 0x80 (128)

•

0x90 (144)

•

0x9d (157)

•

0xbf (191)

•

0xfb (251)

Providing a choice of five types enables the IP Phones to operate if a

value is already in use by a different vendor. Select only one Type byte.

Length (1 octet):

This is variable; it depends on message content.

Data (length octets):

ASCII based format: "VLAN-A:XXX+YYY+ZZZ." where,

• "VLAN–A:" – uniquely identifies this as the Nortel DHCP VLAN

discovery. Additionally, the "–A" signifies this version of this spec.

Future enhancements could use "–B" for example.

• ASCII "+" or "," is used to separate fields.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010