| http://www.w3.org/ns/prov#value | - If system 100 has entered state 830 in this manner, the signals are slightly different: On-Hook is still low and Vline is low, but Test is low and BaseDrive is approximately 0.8 V. Once device 10 no longer uses telephone line 110, system 100 moves from state 830 to state 820, but only after a 15 second or so delay, so that the central messaging system (e.g., the PBX) can update message waiting sta
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