| http://www.w3.org/ns/prov#value | - A problem which however needs to be solved is to quickly trip the ringing signal when the subscriber lifts the phone in order to prevent the strong currents which otherwisethreaten to destroy the SLIC.At conventional ring trip detection, i.e. the detection of when the subscriber lifts the phone during the ringing process, the DC shift is detected, which occurs when the phone is lifted (off-hook) a
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