i have follow this ...http://www.cisco.com/en/US/ts/fn/620/fn62949.html
Cisco recommends the use of Firmware release 8.2(2)SR1 or later releases. This release and later versions are free of this defect. Registered users may obtain this release from the Cisco Unified IP Phone Firmware downloads (registered customers only) page. Select the proper load for your model of IP Phone.
Recovery of the IP Phone:
- Make sure your phones are on a network with a valid DHCP server.
- Make sure the DHCP server on this network has a valid Option 150 setting pointing to a valid Cisco TFTP server.
- Make sure you have a valid term11.default.loads file from load 8.2(2)SR1 or higher on the TFTP server that is referenced in Option 150.
- Make sure you have all other needed image files present on this same TFTP server. * See note below.
Change the timing on the network - the problem is related to timing. Toggle switch port settings between "Auto" and "100Mbps." On a Cisco switch the command to toggle the switch port switch:
interface range fastethernet
set speed 100
set duplex full
Wait 10 minutes, or until all the phones have been updated, then issue the following command if desired to return to original configuration:
interface range fastethernet
set speed auto
set duplex auto
Ensure that items 1 through 5 have been completed. If performing these five steps does not resolve the issue, continue with the remaining steps.
- Pull power on the phone (even if power is PoE).
- Hold down the # key on the phone.
- Continue holding down the # key and re-apply power.
- While still holding the # key wait for the Message Waiting Indicator (MWI) light on the handset to start flashing.
- Once the MWI light is flashing, release the # key and enter the following sequence exactly on the keypad:3491672850*#Once this sequence has been entered on the IP Phone, if all the network criteria above have been met, it should begin its recovery process. This process can take up to 15 minutes to finish. The phone may appear to be doing nothing during this time. However, if the phone does not recover after 20 minutes then it is possible that the recovery is stuck. In this case, re-examine your network and verify that steps 1-4 are in place, then re-issue the factory reset sequence.
