org.freedesktop.ModemManager1.Call: ModemManager Reference Manual

## org.freedesktop.ModemManager1.Call org.freedesktop.ModemManager1.Call — The ModemManager Call interface. |

## Methods

    Start    ();
    Accept   ();
    Hangup   ();
    SendDtmf (IN  s dtmf);

## Signals

    DtmfReceived (s dtmf);
    StateChanged (i old,
                  i new,
                  u reason);

## Properties

    State        readable   i
    StateReason  readable   i
    Direction    readable   i
    Number       readable   s
    AudioPort    readable   s
    AudioFormat  readable   a{sv}

## Description

The Call interface Defines operations and properties of a single Call.

## Method Details

### The Start() method

    Start ();

If the outgoing call has not yet been started, start it.

Applicable only if state is `MM_CALL_STATE_UNKNOWN` and direction is `MM_CALL_DIRECTION_OUTGOING`.

### The Accept() method

    Accept ();

Accept incoming call (answer).

Applicable only if state is `MM_CALL_STATE_RINGING_IN` and direction is `MM_CALL_DIRECTION_INCOMING`.

### The Hangup() method

    Hangup ();

Hangup the active call.

Applicable only if state is `MM_CALL_STATE_UNKNOWN`.

### The SendDtmf() method

    SendDtmf (IN  s dtmf);

Send a DTMF tone (Dual Tone Multi-Frequency) (only on supported modem).

Applicable only if state is `MM_CALL_STATE_ACTIVE`.

`IN s `dtmf``: | DTMF tone identifier [0-9A-D*#].

## Signal Details

### The "DtmfReceived" signal

    DtmfReceived (s dtmf);

Emitted when a DTMF tone is received (only on supported modem)

`s `dtmf``: | DTMF tone identifier [0-9A-D*#].

### The "StateChanged" signal

    StateChanged (i old,
                  i new,
                  u reason);

Emitted when call changes state

`i `old``: | Old state MMCallState
`i `new``: | New state MMCallState
`u `reason``: | A MMCallStateReason value, specifying the reason for this state change.

## Property Details

### The "State" property

    State  readable   i

A MMCallState value, describing the state of the call.

### The "StateReason" property

    StateReason  readable   i

A MMCallStateReason value, describing why the state is changed.

### The "Direction" property

    Direction  readable   i

A MMCallDirection value, describing the direction of the call.

### The "Number" property

    Number  readable   s

The remote phone number.

### The "AudioPort" property

    AudioPort  readable   s

If call audio is routed via the host, the name of the kernel device that provides the audio. For example, with certain Huawei USB modems, this property might be "ttyUSB2" indicating audio is available via ttyUSB2 in the format described by the AudioFormat property.

### The "AudioFormat" property

    AudioFormat  readable   a{sv}

If call audio is routed via the host, a description of the audio format supported by the audio port.

This property may include the following items:

`"encoding"` | The audio encoding format. For example, "pcm" for PCM audio.
`"resolution"` | The sampling precision and its encoding format. For example, "s16le" for signed 16-bit little-endian samples.
`"rate"` | The sampling rate as an unsigned integer. For example, 8000 for 8000hz.