Can't recall if I posted this link earlier, but for those interested in details of the install that I got with Snap / Enable, I've recorded the details here:
http://halswellufb.blogspot.co.nz/
Everything went very smoothly. Only issue I've got is with DTMF tones - default setting (RTP + Inband) on the FritzBox works with the Snap voicemail, but fails with AirNZ/Telecom etc. Swap it to a setting (Inband) that works with the likes of AirNZ/Telecom is ok, but then can't access voicemail 8-(.
Not a big issue because admittedly I get all voicemail forwarded to my phone anyway.
Nigel H.