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Option
Description
Option 15
Specifies the domain name. The domain name is required to resolve DNS names
into IP addresses.
Configure this option if you use a DNS name for the HTTP server. Otherwise, you
can specify a domain as part of customizing the HTTP server.
This domain name is appended to the DNS addresses specified in Option 6 before
the phone attempts to resolve the DNS address. The phone queries the DNS
address in the order they are specified in Option 6. If there is no response from an
address, the phone queries the next DNS address.
As an alternative to administering DNS by DHCP, you can specify the DNS server
and domain name in the HTTP script file. If you use the script file, you must
configure the DNSSRVR and DOMAIN parameters so that you can use the values of
these parameters in the script.
Administer Option 6 and Option 15 appropriately with DNS servers and domain
names respectively.
Option 42
Specifies the SNTP IP address list. List servers in the order of preference. The
minimum length is 4 and the length must be a multiple of 4.
Option 43
Specifies the encapsulated vendor-specific options that clients and servers use to
exchange the vendor-specific information. Option 43 is processed only if the first
code in the Option is 1 with a value of 6889. The value 6889 is an Avaya enterprise
number. All values are interpreted as strings of ASCII characters that are accepted
with or without a null termination character. Any invalid value is ignored and the
corresponding parameter value is not set. Cannot be used simultaneously with
DHCP SSON (Option 242).
Option 51
Specifies the DHCP lease time. If this option is not received, the DHCPOFFER is not
accepted. Assign a lease time of six weeks or greater. If this option has a value of
FFFFFFFF hex, the IP address lease is assumed to be infinite, so that the renewal
and rebinding procedures are not necessary even if Options 58 and 59 are received.
Expired leases causes the device to reboot.
Option 52
Specifies the overload option. If this option is received in a message, the device
interprets the sname and file parameters.
Option 53
Specifies the DHCP message type. The value can be one of the following:
• 1 for DHCPDISCOVER
• 3 for DHCPREQUEST
For DHCPREQUEST sent to renew the device IP address lease:
• If a DHCPACK is received in response, a log event record is generated with a Log
Category of DHCP.
• If a DHCPNAK is received in response, the device immediately ceases IP address
usage, generates a log event record, sets IPADD to 0.0.0.0, and enters the DHCP
INIT state.
Table continues…
Configuration through DHCP
April 2020
Installing and Administering Avaya J100 series IP Phones in an Open SIP
environment
53