AudioCodes Mediant 600 - Page 718

SIP User's Manual 718 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
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 detects 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
[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).