Obihai OBi100, Administration Manual

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Copyright 2010-2013 Obihai Technology, Inc. 155
DetectPolarityReversal Enable polarity reversal detection Yes
DetectFarEndLongSilence Eanble the detection of long period of voice inactivity as a trigger to end
the current call Yes
SilenceDetectSensitivity PSTN line silence detection servers the purpose of determining if the
PSTN peer has ended the call when silence is detected for a prolonged
period (while CPC, Disconnect Tone, and Polarity Reversal signals are not
available).
This parameter is used to select a sensitivity level for OBi silence
detection. Available choices are:
Low (harder to detect silence)
Medium (suggested)
High (easier to detect silence) Yes
SilenceTimeThreshold For OBi to declare that the PSTN line has gone silent, the energy level of
the signal received from the far end has to fall below the threshold
selected in SilenceSignalThreshold for at least a certain continuous period
of time. This parameter specifies the minimum duration of this silent
period in seconds. 60
DetectDisconnectTone Enable the detection of disconnect tone (as specified in
DisconnectTonePattern parameter) as a trigger to end the current call Yes
DisconnectTonePattern A tone pattern that describes the tone from the phone company when
the call is terminated by the peer or by the phone company herself. For
example, a fast busy tone or busy tone can be used as the disconnect
tone. 480-30,620-
30;10;(.25+.25)
Port Settings
ACImpedance Off-hook AC termination 600
OnHookSpeed Time for line-side device to go on-hook 0.5 ms
TipRingVoltageAdjust Voltage on DCT pin of line-side device, which affects TIP/RING voltage on
the line. Low-voltage countries should use lower TIP/RING voltage 3.5 V
MinOperationalLoopCurrent Minimum loop current the LINE port hardware can operate at 10 mA
CurrentLimitingEnable Limit loop current to 60 mA per the TBR21 standard No
ChannelTxGain Gain in dB (-15 to 15) to apply to the signal transmit from the OBi to the
PSTN company 0
ChannelRxGain Gain in dB (-15 to 15) to apply to the signal received by the OBi from the
PSTN company 5
LineInUseVoltageThreshold Voltage below which to detect a parallel device off-hook when LINE port
hardware is in the On-Hook state 25
LineInUseCurrentThreshold Current (mA) above which to detect a parallel device off-hook when LINE
port hardware is in the Off-Hook state 12
CallerIDDetectMethod The Caller ID delivery standard for which the OBi device should assume
when decoding Caller ID signal received from the PSTN company.
Available choices are:
FSK(Bell202)
FSK(V.23)
DTMF(Finland, Sweden)
DTMF(Denmark) FSK(Bell 202)
DTMFPlaybackLevel The energy level of DTMF signal transmitted on PSTN line port in dBm (-
90 to 3) -5
Ring Detection
RingFrequencyMin Minimum ring frequency to detect 15
RingFrequencyMax Maximum ring frequency to detect 50
RingThreshold Voltages (Vrms) below the lower limit will not trigger ring detection;
voltages above the upper limit will 40.50-49.50
RingValidationTime Time in ms to validate the ring signal 640