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zyo:Yeah, I get that - but they actively blocking VOIP? From the reading of their FAQ you can't do VOIP on their system.
Landline is a pretty low margin service (some might argue its legacy even) I'd say skinny simply doesnt want to spend on the training / support infrastructure.
Might be trickier to config initially due to CGNAT but nothing is blocked as far as I know.
https://www.geekzone.co.nz/forums.asp?forumid=137&topicid=240431