On Wed, 2 Apr 2008, Carl Brewer wrote:
I'm looking to hook up a VOIP phone from a client's home to their
work, at home they have a PC running XP hooked up to a generic DSL
router doing NAT, and their work system has NetBSD 4.0 (i386) as their
network gateway (also NAT'ing) and the PBX is inside their network.
The easiest way to do this that I can see is to use OpenVPN as an
ethernet bridge, SIP's a terrible protocol to pass through firewalls
etc, and I figure the simplest way (if not necessarily the most
efficient) will be to bridge the network.
[snip]
Not quite what you are asking, but I've had no problems at all with
using OpenVPN in routing (i.e. tun) mode to do exactly this. I've even
gone as far as making client to client calls.