This was at the tail-end of a Robert Cringely article this week:

/And there are other dirty tricks available to broadband ISPs. Telecom
New Zealand, for example, is reportedly planning to alter TCP packet
interleaving to discourage VoIP. By bunching all voice packets in the
first half of each second, half a second of dead air would be added to
every conversation, changing latency in a way that would drive
grandmothers everywhere back to their old phone companies. This is
because phone conversations happen effectively in real time and so are
very sensitive to problems of latency. Where one-way video and audio can
use buffering to overcome almost any interleaving issue, it is a
deal-breaker for voice.
/
First, where does he get this information? Secondly, do TNZ really think
they can get away with this one? Thirdly, would the regulator even
understand the paragraph above?

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