Do FXS interfaces on a 4FXS1FXO interface card support polarity reversal

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FXS interfaces on a 4FXS1FXO interface card support polarity reversal. This function is disabled by default.

Other related questions:
Which impedance modes do FXS interfaces on a 4FXS1FXO interface card support
FXS interfaces on a 4FXS1FXO interface card support two DC impedance modes: 50 ohm (default) and 800 ohm. FXS interfaces on a 4FXS1FXO interface card support three AC impedance modes: 600 ohm (default), 270+(750||150 nF) ohm, and 275+(780||150 nF).

Which feed current types Do FXS interfaces on a 4FXS1FXO INTERFACE CARD Support
FXS interfaces on a 4FXS1FXO interface card support the following feed current types: 0-16 mA constant current 1-20 mA constant current 2-25 mA constant current 3-30 mA constant current 4-35 mA constant current 5-40 mA constant current 6-45 mA constant current

Which AC impedance modes do FXS interfaces on a 4FXS1FXO interface card support
FXS interfaces on a 4FXS1FXO interface card support the following AC impedance modes: 0 - CNOF (200+680||100nf) 1 - CNUSER (200+560||100nf) 2 - 600 ohm interface (default) 3 �?RUSSIA (150+510||47nf) 4-(220+820||115nf) 5-(220+820||120nf) 6 - 900 ohm interface 7 - BRAZIL (800||50nF) 8-BT0 (Zin=87+1052||228nF+229||284nF,Zload=93+615||471nF+179||495nF+244||32nF)

What is the signaling frequency of the FXS interfaces on a 4FXS1FXO interface card
The FXS interfaces on a 4FXS1FXO interface card support signaling frequencies of 16 Hz, 25 Hz, and 50 Hz. The default signaling frequency is 25 Hz.

Does the U1930 support polarity reversal signals
All U1900 series voice gateways, including U1930, support polarity reversal signals.

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