H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 3/26 (2006.01)
Patent
CA 2319706
A Manual 800 method of learning the characteristics of any telephone with a 4- wire port interface by enabling a Manual 800 mode, sending a preamble, attenuating a transmit channel, attenuating a receive channel, enabling switching algorithms and disabling the Manual 800 mode.
Hello Direct Inc.
Long And Cameron
LandOfFree
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