re: "what is the state of voip-over-cellular as essentially the last
holdout
of TDM? Will the new 4G stuff be able to support latencies, etc? Has
the
work on handovers-over-IP matured enough that it's viable?"
One of the biggest hurdles in bringing Ethernet to mobile/cellular apps
has been its lack of synchronous capabilities. This is now being
overcome
in a variety of ways, both IETF-instigated and at IEEE, and through
some
proprietary solutions where vendors are re-introducing system clocking.
See
my footer note <fac:> that addresses this subject at the bottom of
[1]this message.