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| org.freedesktop.ModemManager1.Callorg.freedesktop.ModemManager1.Call — The ModemManager Call interface. | 
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.
Accept ();
Accept incoming call (answer).
        Applicable only if state is MM_CALL_STATE_RINGING_IN and direction is
        MM_CALL_DIRECTION_INCOMING.
Hangup ();
Hangup the active call.
        Applicable only if state is MM_CALL_STATE_UNKNOWN.
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.
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 | DTMF tone identifier [0-9A-D*#]. | 
DtmfReceived (s dtmf);
Emitted when a DTMF tone is received (only on supported modem)
| 
 | DTMF tone identifier [0-9A-D*#]. | 
StateChanged (i old,
              i new,
              u reason);
Emitted when call changes state
| 
 | Old state MMCallState | 
| 
 | New state MMCallState | 
| 
 | A MMCallStateReason value, specifying the reason for this state change. | 
StateReason readable i
A MMCallStateReason value, describing why the state is changed.
Direction readable i
A MMCallDirection value, describing the direction of the call.