Avaya 9608 Administration page 54

Administering DHCP and HTTP servers
"DHCP". If a DHCPNAK is received in response to a DHCPREQUEST sent to renew
the deskphone's IP address lease, the deskphone will immediately cease use of the IP
address, a log event record will be generated, IPADD will be set to "0.0.0.0", and the
deskphone will enter the DHCP INIT state.
- Option 55 - Parameter Request List.
Acceptable values are:
1 (subnet mask),
3 (router IP Address[es])
6 (domain name server IP Address[es])
7 (log server)
15 (domain name)
26 (Interface MTU)
42 (NTP servers)
SSON (site-specific option number)
- Option 57 - Maximum DHCP message size.
Release 2.5+ value is 1000; prior to R2.5, value was 576.
- Option 58 - DHCP lease renew time.
If not received or if this value is greater than that for Option 51, the default value of T1
(renewal timer) is used as per IETF RFC 2131, Section 4.5.
- Option 59 - DHCP lease rebind time.
If not received or if this value is greater than that for Option 51, the default value of T2
(rebinding timer) is used as per RFC 2131, Section 4.5
- Option 242 - Site-Specific Option Number (SSON)
You do not have to use Option 242. If you do not use this option, you must ensure that
the key information, especially HTTPSRVR, is administered appropriately elsewhere.
Avaya recommends that you administer DHCP servers to deliver only the options
specified in this section and
Administering additional, unexpected options might have unexpected results,
including causing the IP deskphone to ignore the DHCP server.
Examples of good DNS administration include:
- Option 6: "aaa.aaa.aaa.aaa"
- Option 15: "dnsexample.yourco.com,zzz.zzz.zzz.zzz"
- Option 42: "aaa.aaa.aaa.aaa"
The 9600 Series IP Telephones do not support Regular Expression Matching, and therefore, do
not use wildcards. For more information, see
9611G, 9621G, and 9641G SIP deskphones
As shown in DHCPACK setting of parameter
parameter values to the DHCPACK message field and option contents shown.
50 Administering Avaya 9601/9608/9608G/9611G/9621G/9641G IP Deskphones SIP
Parameters set by DHCP in a site-specific
Administering options for the 9601,9608, 9608G,
on page 65.
values, the 9600 Series IP deskphone sets the
Comments? infodev@avaya.com
option.