I've connected a couple of different wireless SIP handsets, Cisco, Unidata, Polycom to the ECS, but it takes some tweaking to get them to work just right. The ECS never really had a well developed proprietary SIP application, and only kinda works with what's out there. Time and patience might make Bria work for you, but it may take way more testing and tweaking than it's worth.

Sometimes the thoughts in my head get so bored, they go for a stroll through my mouth. This is rarely a good thing.