Vendor Specific DHCP Options

DHCP Option 60 controls how the phone identifies itself to a DHCP server for Polycom-specific options that must be returned.

If Option 60 format is set to RFC 3925, all returned values of Option 43 are ignored. If the format is set to an ASCII string, the Option 43 would have a hexadecimal string value encapsulating sub-options that override options received outside DHCP Option 43.

If you do not have control of your DHCP server or do not have the ability to set the DHCP options, enable the phone to automatically discover the provisioning server address. You can do this by connecting to a secondary DHCP server that responds to DHCP INFORM queries with a requested provisioning server value. For more information, see RFC 3361 and RFC 3925.

The following table lists supported DHCP Option 43 individual sub-options and combination sub-options:

Option

Results

Option 1- subnet mask

The phone parses the value from Option 43.

Option 2 - Time offset

The phone parses the value.

Option 3 - Router

The phone parses the value.

Option 4 - TIME/ITP server address (RFC 868)

The phone parses the value.

Option 6 - Domain Name Server

The phone parses the value.

Option 7 - Domain Log server

The phone parses the value.

Option 15 - Domain Name

The phone parses the value.

Option 42 - Network Time Protocol server/SNTP server address (RFC 1769)

The phone parses the value.

Option 66 - Provisioning Server Address

The phone parses the value.

Option 128 - 255

Available option range for configuring a custom boot server address when option 66 is not used.

Sub-options configured in Option 43

Options 1, 2, 3, 4, 5, 6, 7, 15, 42, and 66

The phone parses the value.

Option 128 - 255

Available option range for configuring a custom boot server address when option 66 is not used.