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DHCP

On (default)

Off

Both

Enable or disable DHCP on your phone.

Enable DHCP to allow your phone to get an IP address from the DHCP server. Otherwise, disable DHCP and manually assign an IP address to your phone.

On

Off (default)

Both

Available only when DHCP is enabled.

To release the IP address that DHCP assigned for reassignment, turn on this switch. The phone loses network connectivity and becomes unregistered. Otherwise, turn off this switch. The phone retains or reacquires the IP address from the DHCP server and restores network connectivity and registration.

On

Off (default)

Cisco Unified CM

Enable or disable alternate TFTP on your phone. You can turn on this switch when DHCP is enabled.

Indicates whether the phone is using an alternate TFTP server.

IP address

IPv4 address

Both

Available only when DHCP is disabled.

You must assign an IP address to the phone when DHCP is disabled. If you assign an IP address with this option, you must also assign a subnet mask and default router (gateway).

Subnet mask

Both

Available only when DHCP is disabled.

You must specify the subset mask used by the phone when DHCP is disabled.

Default router

Both

Available only when DHCP is disabled.

Identify the default router for the phone to use when DHCP is disabled.

IPv4 DNS address 1

Both

Available only when DHCP is disabled.

Identify the primary Domain Name System (DNS) server that the phone uses.

Both

Available only when DHCP is disabled.

Identify the secondary Domain Name System (DNS) server that the phone uses.

Cisco Unified CM

Available only when DHCP is disabled.

Identify the optional backup Domain Name System (DNS) server that the phone uses.

Cisco Unified CM

Available only when Alternate TFTP is enabled.

Primary Trivial File Transfer Protocol (TFTP) server that the phone uses. If you are not using DHCP in your network and you want to change this server, you must use the TFTP Server 1 option.

If Alternate TFTP is enabled, enter a non-zero value for the TFTP Server 1 option.

If neither the primary TFTP server nor the backup TFTP server is listed in the CTL or ITL file on the phone, you must unlock the file before you can save changes to the TFTP Server 1 option. In this case, the phone deletes the file when you save changes to the TFTP Server 1 option. A new CTL or ITL file downloads from the new TFTP Server 1 address.

When the phone looks for the TFTP server, the phone gives precedence to manually assigned TFTP servers, regardless of the protocol.

Cisco Unified CM

Available only when Alternate TFTP is enabled.

Optional backup TFTP server that the phone uses if the primary TFTP server is unavailable.

If neither the primary TFTP server nor the backup TFTP server is listed in the CTL or ITL file on the phone, you must unlock either of the files before you can save changes to the TFTP Server 2 option. In this case, the phone deletes either of the files when you save changes to the TFTP Server 2 option. A new CTL or ITL file downloads from the new TFTP Server 2 address.

If you forget to unlock the CTL or ITL file, you can change the TFTP Server 2 address in either file, then erase them by pressing Erase from the Security Configuration menu. A new CTL or ITL file downloads from the new TFTP Server 2 address.

When the phone looks for the TFTP server, it gives precedence to manually assigned TFTP servers, regardless of the protocol.

On

Off (default)

Cisco Unified CM

Bootstrap Protocol (BOOTP) server that a phone uses to automatically assign IP addresses when the phone boot with an IP address of 0.0.0.0. The BOOTP server listens for requests and responds with configuration data including the IP address.

Webex Calling

Specify the DHCPv4 options that can deliver configuration parameters from a DHCP server to the phone.