According to the pfSense blog there’s been an effort to implement Freeswitch as an installable package to pfSense. This is very interesting. There’s a long list of comments to the blog post which collectively spell out some of the merits of this idea, as well as how it relates to running an IP-PBX inside the LAN.
Some indicate a preference for Asterisk over Freeswitch. Others ask for a lightweight configuration supporting just a SIP proxy to an inside PBX. It’s noted that Freeswitch is a much larger application than siproxd, which would handle that well enough.
I’ve been considering giving pfSense a try. This is just one more good reason to make the effort some time soon.