# FXO Interface Configuration

The FXO Interface Configuration dialog box provides information on general interface configuration, FXO specific configuration, and analog interface configuration for the selected FXO port.

## Navigation

Right-click on an FXO port, then select Configure > FXO Interface Configuration from the popup menu.

The following information appears:

> FXO

> Signal Type (cvaIfFXOCfgSignalType)

> Dial Type (cvaIfFXOCfgDialType)

> Supervisory Disconnect (cvaIfFXOCfgSupDisconnect)

> Hook Status (cvaIfFXOHookStatus)

> Ring Detect (cvaIfFXORingDetect)

> Ring Ground Status (cvaIfFXORingGround)

> Tip Ground Status (cvaIfFXOTipGround)

> Connection Mode (cvIfCfgConnectionMode)

> Analog Information

> Status (cvaIfStatusInfoType)

> Impedance (cvaIfCfgImpedance)

> Maintenance Mode (cvaIfMaintenanceMode)

> Signal Errors (cvaIfStatusSignalErrors)

> Integrated DSP (cvaIfCfgIntegratedDSP)

## Related Topics

FXO Voice Configuration

### Signal Type (cvaIfFXOCfgSignalType)

Indicates the signaling type of FXO interface.

Values are:

Default is Loop start.

### Dial Type (cvaIfFXOCfgDialType)

The type of outdialing the FXO interface can perform.

Values are:

> dtmf (default value)

> pulse

### Supervisory disconnect (cvaIfFXOCfgSupDisconnect)

Specifies whether a supervisory disconnect signal (CPC) will be presented to the interface when the party connected at the interface hangs up.

### Hook Status (cvaIfFXOHookStatus)

The hook status of the FXO interface.

Values are:

> onHook

> offHook

### Ring Detect (cvaIfFXORingDetect)

Specifies whether the interface detects a ring from PBX or CO.

Values are:

> true

> false

### Ring Ground Status (cvaIfFXORingGround)

The incoming ring ground indication. It is valid only when the cvaIfFXOCfgSignalType is fxoGroundStart.

Values are:

True | The interface present a ring ground to the connected equipment
False | The interface does not present a ring ground to the connected equipment

### Tip Ground Status (cvaIfFXOTipGround)

The incoming tip ground indication. It is only valid when the cvaIfFXOCfgSignalType is fxoGroundStart.

Values are:

True | The interface presents a tip ground to the connected equipment
False | The interface does not present a tip ground to the connected equipment

### Connection Mode (cvIfCfgConnectionMode)

The connection mode of the interface.

Values are:

Normal | The interface acts normally to handle incoming and outgoing calls.
Trunk | The interface acts in trunking mode. Trunking mode causes two interfaces (on either the same or different routers) to be always conferenced together, and telephony signaling to be passed transparently through the VoIP system rather than trapped and interpreted by the session application on the router(s).
Plar | The interface acts in private-line automatic ringdown (PLAR) mode. PLAR is handled by associating a peer directly with an interface so that when the interface goes off-hook, that peer is used to set up the second call leg and conference them together without the caller having to dial any digits.

### Status (cvaIfStatusInfoType)

The information transfer services for the current or last call.

Values are:

This is available only for analog interfaces.

### Impedance (cvaIfCfgImpedance)

The terminating impedance of voice analog interfaces.

Values are:

Other | None of the values listed here. Arbitrary, within limits for special cases
Ohms600Real | 600 ohms
Ohms600Complex | 600 ohms + 2.16uF
Ohms900Complex | 900 ohms + 2.16uF
OhmsComplex 1 | complex 1; 220 Ohms + 820 Ohms || 115nF. Used primarily in Germany.
OhmsComplex 2 | complex2; 270 Ohms + 750 Ohms || 150nF. Used primarily in the United Kingdom and Sweden.

### Maintenance Mode (cvaIfMaintenanceMode)

The maintenance mode of the analog voice interface.

Values are:

Host Uncompressed Loopback | Set by the managed system to perform the uncompressed voice loopback test. The voice packet is sent by voice application all the way through the interface associated codec and then turned around instead of being sent to the telephony endpoint.
Interface Compressed Loopback | Set by the managed system to perform the interface uncompressed voice loopback test for the external test equipment that is connected to the voice interface. The voice samples are sent from the test equipment all the way through the interface associated codec and then turned around instead of being sent to the voice application.
Host Compressed Loopback | Set by the managed system to perform the compressed voice loopback test. The voice packet is passed by voice application to the interface associated codec. Instead of feeding these into the codec for decompression, they are immediately sent back to the voice application as if they had originated locally and had been compressed.
Interface Uncompressed Loopback | Set by the managed system to perform the interface uncompressed voice loopback test for the external test equipment that is connected to the voice interface. The voice samples are sent from the test equipment to the interface associated codec. Instead of feeding the voice samples into the codec for compression, they are immediately sent back to the telephony interface.
None | Interface is not in maintenance mode

### Signal Errors (cvaIfStatusSignalErrors)

The accumulated number of signaling protocol errors that are detected in the interface since system startup.

### Integrated DSP (cvaIfCfgIntegratedDSP)

Indicates whether the interface has an integrated digital signal processing (DSP) unit.