I have been running the Asterisk system for a few years now and it works great.
The server is at the home office but I have employees who work out of their own home offices and connect via VPN to our office. Currently they use a soft phone but for a few reasons, I don’t think that is ideal. It would be preferable if I could buy them a hard VoIP phone that is configured to connect through their firewall and our firewall to the Asterisk server so they can make or take calls regardless if the PC is running.
Is this possible? Is there a special phone needed that can do this? What configurations do we need to make on our firewalls to make this work? Where can I find documentation or assistance on this?