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40 Avaya one-X™ Deskphone Value Edition 1600 Series IP Telephones Administrator Guide Release 1.0
Note:
Note: The DHCP standard states that when a DHCP lease expires, the device should
immediately cease using its assigned IP address. If the network has problems
and the only DHCP server is centralized, the server is not accessible to the given
telephone. In this case the telephone is not usable until the server can be
reached.
Avaya recommends, once assigned an IP address, the telephone continues
using that address after the DHCP lease expires, until a conflict with another
device is detected. As Table 7: 1600 Series IP Telephone Customizable System
Parameters indicates, the system parameter DHCPSTD allows an administrator
to specify that the telephone will either:
a). Comply with the DHCP standard by setting DHCPSTD to “1”, or
b). Continue to use its IP address after the DHCP lease expires by setting
DHCPSTD to “0.”
The latter case is the default. If the default is invoked, after the DHCP lease
expires the telephone sends an ARP Request for its own IP address every five
seconds.
The request continues either forever, or until the telephone receives an ARP
Reply. After receiving an ARP Reply, the telephone displays an error message,
sets its IP address to 0.0.0.0, and attempts to contact the DHCP server again.
- Option 52 - Overload Option, if desired.
If this option is received in a message, the telephone interprets the sname and file
fields in accordance with IETF RFC 2132,
Section 9.3, listed in Appendix B: Related Documentation
.
- Option 53 - DHCP message type.
Value is 1 (DHCPDISCOVER) or 3 (DHCPREQUEST).
- Option 55 - Parameter Request List.
Acceptable values are:
1 (subnet mask),
3 (router IP address[es])
6 (domain name server IP address[es])
15 (domain name)
NVSSON (site-specific option number)
- Option 57 - Maximum DHCP message size.
- 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 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