It should work fine. They look like a regular SIP phone as far as configuration and registration goes. We deploy them behind TA900 units on a hosted platform but I see no reason why they shouldn't work with the 7000.
Patrick, as long as the phone is a standard SIP phone, you should be able to register it to the 7100. The SPRE *38 as generated from a SIP phone will trigger the door relay on the 7100. Thanks