System information

Network features 429
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.
• ASCII "." is used to signal end of structure.
• XXX, YYY and ZZZ are ASCII encoded decimal numbers with a range
of 0-4095. The number is used to identify the VLAN Ids. There are a
maximum of 10 VLAN IDs can be configured in the current version.
String "none" or "NONE" means no VLAN (default VLAN).
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368 05.02 26 May 2009
Copyright © 2003-2009 Nortel Networks. All Rights Reserved.
.