Not only does it support H.323 and SIP, but new VoIP protocols or
devices can be added very easily.
BTW: OPAL is an acronym for Open Phone Abstraction Library, but
that is not really important :)
Compile fails at the moment because it needs a newer pwlib (I
think). I'll look into that. Also needs a small modification to
mk/scripts/extract and bsd.pkg.extract.mk. (I'll send a pr for
that.)
