Can i use Cisco IP SIP phones with asterisk system with most of cisco features

Need help regarding mentioned query as i have lots of cisco IP phones and i want to register it to asterisk system.Is it possible or do i have to play around some firmware thing??

You can use your Cisco devices registered on Asterisk server or any other SIP server.

You must create a compatible sip xml configuration file and put that in a tftp server and point your devices to acquire configuration files from there.

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