The SPA2102 is a newer product than the PAP2T (which is pretty old/outdated now), and has better voice quality - I'd go for this over a PAP2T. Having said that, I think the SPA2102 has (or is about to be) discontinued as well.
Be careful with the overseas ones - a number of the cheaply available ones are ones that were sold through a specific VoIP provider, with their firmware from the factory. They have generally then had firmware cloned across from another device, and people have run in to all sorts of dramas with MAC address conflicts etc.
In the VoIP world, it's often a matter of getting what you pay for, both in terms of hardware, and service providers. As you've already seen, there can be huge problems getting things going, and paying that little bit extra can save you a lot of frustration in terms of use.
Yes your right the spa2102 is now superceeded but not sure if the newer model in NZ yet hence not mentioning it. Also 2talk not showing a provisioning file for it yet. Not sure about world exchange. You can of course get off ebay. I had lots of success with the reliable papt2t , It does what it does really well. The spa2102 does not do wireless and only has an additional rj45 port so it purports to be a router but as most people want wireless and a few ports then i suggest using the existing router most people have anyway and getting the pat2t.
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