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Network Settings
4-12 41-001343-02 REV04 – 05.2014
Using Option 77 User Class on the IP Phone
DHCP Option 77 User Class is sent in DHCP request packets from the phone to the configuration server. This Option 77
defines specific User Class identifiers to convey information about a phone’s software configuration or about its user's
preferences. For example, you can use the User Class option to configure all phones in the Accounting Department with
different user preferences than the phones in the Marketing Department. A DHCP server uses the User Class option to
choose the address pool for which it allocates an address from, and/or to select any other configuration option.
An Administrator can configure the DHCP Option 77 User Class via the configuration files and the IP Phone UI.
Configuring DHCP Option 77 User Class on the IP Phone
Use the following procedures to configure DHCP Option 77 User Class on the IP Phone.
Aastra Web UI
1. Click on Advanced Settings->Network->Basic Network Settings.
2. By default, the “Hostname” field is automatically populated with [<Model><MAC address>] of your phone (for example,
53i00085D164435).
If you want to change the hostname, enter a hostname for your phone in the “Hostname” field.
Valid values are up to 64 alpha-numeric characters. You can use a fully qualified domain name if required.
3. Click Save Settings to save your changes.
Note:
Changing the “Hostname” field requires a reboot of your phone.
4. Click on Operation->Reset, and click Restart.
Notes:
• If the User Class is not specified (left blank) in the DHCP request packet, the phone does not send the User Class DHCP
Option 77.
• Multiple User Classes inside a DHCP Option 77 are not supported.
• DHCP Option 77 may affect the precedence of DHCP Options, dependent on the DHCP Server.
Configuration Files
For specific parameters you can set in the configuration files, see Appendix A, the section, “DHCP Option Settings” on pageA-12.