Dear bro Sheraz,
I'm not exactly sure at which stage you are in setting up your router for CME using the 9971 phones as SIP extensions, but the guide specified by Shalu post is a pretty good starting place.
Once you've followed those steps, you will have typed the command "create profile" under the "voice register global" section. This will generate files that have the convention of SEPxxxx.cnf.xml, where the xxxx=MAC address of your 9971 IP phone. You will most likely find these in the root directory of flash (run the command "show flash:").
When you identify the file that contains the MAC address of the IP phone you want to get rid of the password, copy it (the SEPxxxx.cnf.xml file) to your tftp server (tftpd32 is a very good choice). Open up this file and locate the following section:
PHONEPASSWORD
If this doesn't exist in the file, then type it in within the XML tags .
Your objective by doing this is to define your own password. If you don't want the password to exist, then delete the word "PHONEPASSWORD".
Now save the file and copy it back via tftp to the router and reset your IP phone. If all went well, you should be able to log into the administrator settings now.
Hope this helps you out.
