How to use Cisco IP Phone 7821 with Asterisk SIP server

[minhvc]

I have tried some sample but cannot configure my cisco 7821 IP phone to Asterisk server. I have install softphone and it run ok.
how to fix it?

http://labs.wrprojects.com/configuring-a-cisco-9951-phone-for-asterisk/

How to Provision Cisco IP Phones 8861, 7861,7821,7811 and 7942G for use with...

Compatible Cisco IP Phones

Hi, I was wondering how did you get it to work without Cisco Call Management Server. We have purchased 2 CP 7861 phone and would like to get it in service. We currently using SPA 303 and 508 but as you know they are limited in support and functions. Your input would be greatly appreciated Happy New Year. Michael