Cisco 7941G - Want to use one extension for several phones; Share phones or office space with coworkers; Answer calls frequently or handle calls on someone’s behalf; Need to make video calls (SCCP phones only)

Set DHCPv6 Address Released Field
Procedure
Step 1
Unlock network configuration options.
Step 2
Scroll to the DHCPv6 Address Released option and press Yes to release the IP address assigned by DHCP,
or press No if you do not want to release this IP address.
Step 3
Press Save.
Set IPv6 Alternate TFTP Field
Procedure
Step 1
Unlock network configuration options.
Step 2
Scroll to the IPv6 Alternate TFTP option and press Yes if the phone should use an alternative TFTP server.
Step 3
Press Save.
Set IPv6 TFTP Server 1 Field
Procedure
Step 1
Unlock the CTL or ITL file if necessary. If both the CTL and ITL files exist, unlock either of the files.
Step 2
If DHCPv6 is enabled, set the Alternate TFTP option to Yes.
Step 3
Scroll to the IPv6 TFTP Server 1 option, press Edit, and then enter a new TFTP server IP address.
Step 4
Press Validate, and then press Save.
Cisco Unified IP Phone 7941G, 7941G-GE, 7942G, 7961G, 7961G-GE, and 7962G Administration Guide for Cisco
Unified Communications Manager 9.0 (SCCP and SIP)
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Cisco Unified IP Phone Settings
Set DHCPv6 Address Released Field