Format Of The Ip Phone 2004 Terminal Dhcp Site Specific Option - Avaya Communication Server 1000 Installation And Commissioning Manual

Troubleshooting WLAN IP Telephony installations
7. ppppp is the port number in ASCII-encoded decimal. It need not be five digits long
8. In all cases, the IP Phone 2004 treats the ASCII-encoded numbers as decimal

Format of the IP Phone 2004 Terminal DHCP Site Specific option

The following definition describes the IP Phone specific, Site Specific option. This option uses
the DHCP options 128 to 254 (reserved for site-specific use, see RFC 1541 and RFC 1533)
and must be returned by the DHCP server as part of each DHCP OFFER and ACK message for
the IP Phone 2004 to accept these messages as valid. The IP Phone 2004 pulls 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
for handsets that emulate the IP Phone 2004
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 Avaya 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.
226 Avaya WLAN IP Telephony Installation and Commissioning
because the (:) and (,) delimiters guarantee parsing. For example, '05001', '5001',
'1', and '00001' are all parsed correctly and accepted as correct. The valid range
is 0 to 65535 (stored internally in the IP Phone 2004 as hexadecimal in the range
0 to 0xFFFF). This field must be no longer than five digits.
values and ignores all leading zeros. More specifically, a leading zero does not
change the interpretation of the value to be OCTAL encoded. For example, 0021,
021, and 21 are all parsed and interpreted as decimal 21.
on page 223.
DHCP support
November 2010