The greening of telephony

I was having a slow weekend and had one of those contemplative moments.

Since the introduction of VoIP handset and the imminent rollout of Video Handsets, we must now be consuming more power to deliver telephone calls to every desk?

Is the amount of power consumed by a traditional TDM switch and analogue handsets less than the VoIP Equivalent? Thinking about the average power rating of a server used to provide an IP-PBX, plus the power consumed by media gateways then add the power to power the phones an the power required for the PoE switch (not including the phones), even with Moore's law driving down the power required for sufficient CPU to drive the IP-PBX this surely is more than the old TDM equivalent??

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