Has anyone achieved, or know of something that might achieve, something equivalent to the SIP Proxy Manager, but for Mac OS X? I'm switching to 3CX for my home office, but when I work on site for clients, its in a range of different offices, with networks over which I have no control, and sometimes not even any ability to install PC software. But I usually take my MacBook Pro with me. So, something like SIP Proxy Manager would allow me to use that to connect my Nokia mobile back to the system at home; I guess it would work in a Windows VM, but that will just slow everything down. A way of achieving the same thing under OS X would be great, so I can work pretty much anywhere, without having to worry about mad NAT configs, or simply forwarding calls from 3CX over the mobile network.