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DHCP options 183
option or a similarly encoded site-specific option must be present.
Configure the DHCP server to send one or the other—but not both. WinNT
implementations must use the Site Specific option. For more information,
see “DHCP support for handsets that emulate the IP Phone 2004” (page
180).
The format of the Terminal DHCP Site Specific option field is: Type,
Length, Data.
•
Type (1 octet): 5 choices: 0x80, 0x90, 0x9d, 0xbf, 0xfb (128, 144, 157,
191, 251)
With the choice of five types, the IP Phone 2004 can operate in
environments where the initial choice 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—format Nortel-i2004-A,iii.jjj.kkk.lll:p
pppp,aaa,rrr;iii.jjj.kkk.lll:pppp,aaa,rrr
— Nortel-i2004-A uniquely identifies this as the Nortel option.
Additionally, the -A signifies this version of this specification. For
example, future enhancements could use -B.
—
ASCII (,)—separates the fields
—
ASCII (;)—separates the primary from secondary server information
—
ASCII (.)—signals the end of the structure
—
iii.jjj.kkk.lll:ppppp—identifies the IP:port for the server
(ASCII-encoded decimal)
—
aaa—identifies the action for server (ASCII-encoded decimal, range
0 to 255)
—
rrr—identifies the retry count for the server (ASCII-encoded
decimal, range 0 to 255)
This string can be NULL terminated although the NULL is not required
for parsing.
Notes:
1.
aaa and rrr are ASCII-encoded decimal numbers with a range of 0 to
255. They identify the Action Code and Retry Count, respectively, for the
associated TPS server. Internally, to the IP Phone 2004, they are stored
as one octet (0x00..0xFF). These fields must be no longer than three
digits.
2.
The first server is always considered the primary, and the second server
always considered secondary.
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.