As my multi tenant cloud business has grown I have come across more than a few clients that still need fax machines and other analog devices. Normally I would put in a FXS patton or grandstream gateway. These devices are supported by a local 3cx install in a LAN but are for some reason not supported by a multi tenant cloud install. This seems to be a very large hole in the product. I would propose that 3cx spend a little time testing and configuring a list of approved gateways and start offering support for this right away.