Version 6.2 459 February 2011
SIP User's Manual 10. Configuration Parameters Reference
Parameter Description
Polarity (Current) Reversal for Call Release (Analog Interfaces) Parameters
Web: Enable Polarity Reversal
EMS: Enable Reversal Polarity
[EnableReversalPolarity]
Enables the polarity reversal feature for call release.
[0] Disable = Disable the polarity reversal service
(default).
[1] Enable = Enable the polarity reversal service.
If the polarity reversal service is enabled, the FXS interface
changes the line polarity on call answer and then changes
it back on call release.
The FXO interface sends a 200 OK response when polarity
reversal signal is detected (applicable only to one-stage
dialing) and releases a call when a second polarity reversal
signal is detected.
Note: This parameter can also be configured per Tel
Profile, using the TelProfile parameter.
Web/EMS: Enable Current Disconnect
[EnableCurrentDisconnect]
Enables call release upon detection of a Current
Disconnect signal.
[0] Disable = Disable the current disconnect service
(default).
[1] Enable = Enable the current disconnect service.
If the current disconnect service is enabled:
The FXO releases a call when a current disconnect
signal is detected on its port.
The FXS interface generates a 'Current Disconnect
Pulse' after a call is released from IP.
The current disconnect duration is configured by the
CurrentDisconnectDuration parameter. The current
disconnect threshold (FXO only) is configured by the
CurrentDisconnectDefaultThreshold parameter. The
frequency at which the analog line voltage is sampled is
configured by the TimeToSampleAnalogLineVoltage
parameter.
Note: This parameter can also be configured per Tel
Profile, using the TelProfile parameter.
EMS: Polarity Reversal Type
[PolarityReversalType]
Defines the voltage change slope during polarity reversal
or wink.
[0] = Soft reverse polarity (default).
[1] = Hard reverse polarity.
Notes:
This parameter is applicable only to FXS interfaces.
Some Caller ID signals use reversal polarity and/or
Wink signals. In these cases, it is recommended to set
the parameter PolarityReversalType to 1 (Hard).
For this parameter to take effect, a device reset is
required.
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