Aastra 5i Series, Administrator'S Manual

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Network Settings
4-14 41-001160-01, Rev 00, Releaes 2.3
IP Phone Administrator Guide
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. You can set this
parameter via the configuration files, IP Phone UI, or the Aastra Web UI. Setting
this parameter results in the phone only using the chosen DHCP option and
ignoring the other options
.
Configuring DHCP Option Override 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-12.