Is there a Software Development Kit for IP Phone 7970 ? If so, can soembody please tell me from where I can get that. Thanx

I had build an applciation that was deployed on cisco IP phone 7960 & 7940 on call manager 3.1(2c). Now they have call managee 3.3(3) and new IP Phone 7970. They are telling me that the application does not work on it. Can someone please advise as to...