User's Manual

444 Features
The choice of using either Vendor Specific or Site Specific options is
provided to enable Windows NT DHCP servers to be used with 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.
Format of the Encapsulated Vendor Specific Sub-option field
The format of the field is as follows:
•
Type (1 octet): 5 choices are provided (0x80, 0x90, 0x9d, 0xbf, 0xfb
[128, 144, 157, 191, 251]), allowing the IP Phone to operate when one
or more values is already in use by a different vendor. Select only one
TYPE byte.
• Length (1 octet): variable – depends on message content.
• Data (length octets): ASCII based with the following format:
Nortel-i2004 -A,iii.jjj.kkk.lll:ppppp,aaa,rrr;iii.jjj.kkk.
lll:pppp,aaa,rrr.
The components in this string are described inTable 110
"Encapsulated Vendor Specific Sub-option field" (page 444) .
Table 110
Encapsulated Vendor Specific Sub-option field
Parameter Description
Nortel-i2004-A
Uniquely identifies this as the Nortel option
Signifies this version of this specification
iii.jjj.kkk.lll:ppppp Identifies IP address:port for server (ASCII encoded decimal)
aaa
Identifies Action for server (ASCII encoded decimal, range 0 to 255)
rrr
Identifies retry count for server (ASCII encoded decimal, range 0 to 255). This
string can be NULL terminated although the NULL is not required for parsing.
ACSII symbols
The comma "," is used to separate fields
The semicolon ";" is used to separate Primary from Secondary server
information
The period "." is used to signal end of structure
Table 111 "Nortel option string" (page 445) shows the "pieces" of the
Nortel option string. The Nortel designator Nortel-i2004-A is separated
from the Connect Server strings using a comma. The Connect Servers
are separated using a semi-colon.
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368 05.06 30 April 2010
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