protocols.
Analog interfaces: This parameter is applicable only to FXO
interfaces.
This parameter is also applicable to the IP-to-IP application.
This parameter can also be configured in a Tel Profile.
Polarity (Current) Reversal for Call Release (Analog Interfaces) Parameters
[SetDefaultLinePolarity
State]
CLI: fxs-fxo > default-
linepolarity-state
Defines the FXO line polarity, required for DID signaling.
[0] = Positive line polarity
[1] = Negative line polarity
[2] = (Default) Auto - The device detects the polarity upon power-up
or upon insertion of the RJ-11 cable, and uses it as a reference
polarity.
Typically, if the RJ-11 cabling is connected correctly (without crossing,
Tip to Tip, Ring to Ring), the Tip line is positive compared to the Ring
line. In this case, set this parameter to 0. With this configuration, the
device assumes that the idle line polarity is Tip line positive.
When the device receives a SIP INVITE, it checks the FXO line polarity.
If the polarity is "Reversed", it skips this FXO line and goes to the next
line.
Notes:
To take advantage of this new feature, configure all FXO lines as a
single Trunk Group with ascending or descending channel select
mode, and configure routing rules to route incoming INVITE
messages to this Trunk Group.
This parameter is applicable only to FXO interfaces.
Web: Enable Polarity
Reversal
EMS: Enable Reversal
Polarity
CLI: polarity-rvrsl
[EnableReversalPolarit
y]
Enables the polarity reversal feature for call release.
[0] Disable = (Default) Disable the polarity reversal service.
[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 in a Tel Profile.
Web/EMS: Enable
Current Disconnect
CLI: current-disc
[EnableCurrentDisconn
ect]
Enables call release upon detection of a Current Disconnect signal.
[0] Disable = (Default) Disable the current disconnect service.
[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 in a Tel Profile.
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