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190 Appendix B Troubleshooting WLAN IP Telephony installations
the relevant information out of this option and uses it to configure the primary
and (optionally) secondary TPSs. Either this encapsulated 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 187).
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:ppppp,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 01.02 Standard
Release 5.0 15 June 2007
Copyright © 2004-2007, Nortel Networks
.