Are all these compatible with each other? If so - how do I connect them?

Hi All,  Is it possible to connect a EHS to the cisco SPA508G model.  I have a plantronics C054A and wish to create a auto answering headset option. Thanks in advance.

Would like to setup SIP on a Cisco 7970 IP Phone.  Have downloaded the following SIP firmware from cisco site. But not sure where to go from here. 7970 and 7971 SIP IP firmware files only - Compatible CUCM Versions: 7.1(5)+  cmterm-7970_7971-sip.9-4-...