AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 179)

4-16 41-001343-01 Rev 03, Release 3.2.2
Using Options 159 and 160 on the IP Phone
In addition to DHCP options 43 and 66 already supported on the IP Phones, the phones also
support DHCP Options 159 and 160. The IP Phones use the following order of precedence when
deriving the configuration server parameters: 43, 160, 159, 66.
In addition, an administrator can override this order of precedence by setting a configuration
parameter called, dhcp config option override (configuration files), DHCP Download
Options (Aastra Web UI), or Download Options (IP Phone UI). Setting this parameter results
in the phone only using the chosen DHCP option and ignoring the other options.
For more information about setting DHCP download preference, see “Configuration Server
Download Precedence” on page 4-19 ..
Configuring DHCP Download Options on the IP Phones
Use the following procedures to configure DHCP Option Override on the IP Phone.
Warning: Administrators should review the updated IP phone DHCP
option precedence order and configuration options to avoid potential
impact to existing Aastra IP phone deployments.
Configuration Files
For specific parameters you can set in the configuration files, see Appendix A, the section, “DHCP Option
Settings” on page A-13.
Aastra IP Phone UI
Step Action
1 Press Options, and then select Administrator Menu.
2 Enter you Administrator password and press Enter.
3 Select Network Settings.
4 Select DHCP Settings.
5 Select Download Options. The following list displays:
• Any (default) - no override - uses normal precedence order of
43, 160, 159, 66.
• Option 43
• Option 66
• Option 159
• Option 160
• Disabled (Ignores all DHCP configuration options (
43, 66, 159, 160)
)