Avaya one-X 1603SW, Administrator'S Manual, Page: 52 / 124

Server Administration
52 Avaya 1603SW-I SIP Deskphones Administrator Guide
Note:
Note:
Option 53 - DHCP message type .
Value is 1 (DHCPDISCOVER) or 3 (DHCPREQUEST). As of Release 2.5, if a
DHCPACK is received in response to a DHCPREQUEST sent to renew the
telephone's IP address lease, a log event record is generated with a Log
Category of "DHCP". If a DHCPNAK is received in response to a
DHCPREQUEST sent to renew the telephone's IP address lease, the telephone
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 telephone 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, listed in
Appendix
B: Related Documentation .
- 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
The 1603SW-I SIP IP Deskphones do not support Regular Expression Matching, and therefore,
do not use wildcards. For more information, see
Administering Options for the 1603SW-I SIP IP
Deskphones on page 73.
Avaya recommends that you administer DHCP servers to deliver only the options specified in
this section and
Table 8 . Administering additional, unexpected options might have unexpected
results, including causing the IP telephone 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 "
Depending on the DHCP application you choose, be aware that the application most
likely does not immediately recycle expired DHCP leases. An expired lease might