Cisco Phones with Asterisk

I have a customer who is looking to move to the Asterisk platform, but he has all Cisco IP phones. While reading up I saw that the supported protocols include SCCP --skinny. I know that this is a relatively new thing, and I am wondering what the best way to integrate the skinny protocol into their asterisk network is.

Is it best to place some type of firm ware onto his phones or is there something you can do to the Asterisk box so that it can translate the skinny?

Any suggestions would be greatly appreciated.

I believe asterisk has sccp support but there is a firmware release out that that will allow the phones to use sip. I would go with that.