Speaking of the PAP2T -- the current Cisco (they own Linksys) documentation for it is total crap. For the unlocked version, one needs the "Administrator's Guide", and the Cisco version is rather generic, covering several of their products under a single title.

But I did eventually locate a copy of the original Linksys PAP2(T) admin guide, and that's just so much better! Between it and wikipedia, I can now figure out what all of the settings are used for.

Mind you, it practically worked without a hitch straight from the box, after I entered the SIP user/passwd and turned on NAT traversal. But the extra fun stuff just tends to draw one in..

Cheers