Compatibility with Cisco IP Phone, FS-108D-POE, and Fusion (Pingtone) Managed Telephony

I need to test the compatibility between a 108D-POE, a Cisco SPA525G IP phone, and the Fusion provider.   The Cisco 108D-POE will be replacing either Cisco 3750 or 2960 switches in the customer's satellite offices, and our switches need to be able to pass VoIP traffic through to a managed telephony infrastructure hosted by Fusion (formerly Pingtone).  Does anyone have experience with a like combination of services and products in order to prove this out?  Michael Pawloski