Option 1

Specifies the subnet mask of the network.

Option 3

Specifies the gateway IP address list. The list can contain up to 127 total ASCII characters. Separate more than one IP address with commas with no intervening spaces.

Option 6

Specifies the DNS server address list. The list can contain up to 127 total ASCII characters. Separate more than one IP address with commas with no intervening spaces.

The phone supports DNS and the dotted decimal addresses. The phone attempts to resolve a non-ASCII-encoded dotted decimal IP address by checking the contents of DHCP Option 6. At least one address in Option 6 must be a valid, nonzero, dotted decimal address, otherwise the DNS address fails.

Option 12

Avaya J100 Series IP Phones identify themselves to the DHCP server by sending the host name in Sub-Option 12 in DHCP DISCOVER and DHCP REQUEST options. The host name has the following format:

AVohhhhhh, where:

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 name and file parameters.

Option 53

Specifies the DHCP message type. The value can be one of the following:

For DHCPREQUEST sent to renew the device IP address lease:

Option 55

Specifies the parameter request list. Acceptable values are:

Option 57

Specifies the maximum DHCP message size.

Set the value to 1500.

Set the value to 1000.

Option 58

Specifies the 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.

Option 59

Specifies the 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.

Option 242

Specifies the site-specific option (SSON). It is optional but cannot be used simultaneously with Option 43.

If you do not configure this option, ensure that one of the following parameters is configured appropriately elsewhere: