No, this model does not yet have a provisioning template. I have a C400 that I have been playing around with a bit, and you can easily (manually) provision it to work with 3CX. It seems to be a good phone, but my one regret about it is that unlike some other Android based phones, the Android Store is not available.
I assume the C600 can also be as easily provisioned as I did see one being demonstrated at a 3CX class in Dallas earlier last year by the hosting distributor.