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ohn starts his presentation with something like … instead of fearing PBX vendors who offer an alternative to traditional PBX, go the easy route and make them your ally. Resell IP PBX from an outsourced vendor and ensure quality of service since you control the network as an ISP.
On the other hand, [...]

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John usually talks to audiences who are very unhappy because they don’t own the network nor have control over QoS, but WISPs and other ISPs attending ISPCON are in control and do own the network. The voice they sell can be as good or bad as they are willing to enable with [...]