This file is indexed.

/usr/share/dbus-1/interfaces/org.freedesktop.ModemManager1.Call.xml is in modemmanager-dev 1.6.8-2ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8" ?>

<!--
 ModemManager 1.0 Interface Specification

   Copyright (C) 2015 Marco Bascetta <marco.bascetta@sadel.it>
   Copyright (C) 2015 Riccardo Vangelisti <riccardo.vangelisti@sadel.it>
-->

<node name="/" xmlns:doc="http://www.freedesktop.org/dbus/1.0/doc.dtd">

  <!--
      org.freedesktop.ModemManager1.Call:
      @short_description: The ModemManager Call interface.

      The Call interface Defines operations and properties of a single Call.
  -->
  <interface name="org.freedesktop.ModemManager1.Call">

    <!--
        Start:

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

        Applicable only if state is <link linkend="MM-CALL-STATE-UNKNOWN:CAPS"><constant>MM_CALL_STATE_UNKNOWN</constant></link> and direction is
        <link linkend="MM-CALL-DIRECTION-OUTGOING:CAPS"><constant>MM_CALL_DIRECTION_OUTGOING</constant></link>.
    -->
    <method name="Start" />

    <!--
        Accept:

        Accept incoming call (answer).

        Applicable only if state is <link linkend="MM-CALL-STATE-RINGING-IN:CAPS"><constant>MM_CALL_STATE_RINGING_IN</constant></link> and direction is
        <link linkend="MM-CALL-DIRECTION-INCOMING:CAPS"><constant>MM_CALL_DIRECTION_INCOMING</constant></link>.
    -->
    <method name="Accept" />

    <!--
        Hangup:

        Hangup the active call.

        Applicable only if state is <link linkend="MM-CALL-STATE-UNKNOWN:CAPS"><constant>MM_CALL_STATE_UNKNOWN</constant></link>.
    -->
    <method name="Hangup"/>

    <!--
        SendDtmf:
        @dtmf: DTMF tone identifier [0-9A-D*#].

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

        Applicable only if state is <link linkend="MM-CALL-STATE-ACTIVE:CAPS"><constant>MM_CALL_STATE_ACTIVE</constant></link>.
    -->
    <method name="SendDtmf">
      <arg name="dtmf" type="s" direction="in"/>
    </method>

    <!--
        DtmfReceived:
        @dtmf: DTMF tone identifier [0-9A-D*#].

        Emitted when a DTMF tone is received (only on supported modem)
    -->
    <signal name="DtmfReceived">
      <arg name="dtmf" type="s" />
    </signal>

    <!--
        StateChanged:
        @old: Old state MMCallState
        @new: New state MMCallState
        @reason: A <link linkend="MMCallStateReason">MMCallStateReason</link> value, specifying the reason for this state change.

        Emitted when call changes state
    -->
    <signal name="StateChanged">
      <arg name="old" type="i" />
      <arg name="new" type="i" />
      <arg name="reason" type="u" />
    </signal>

    <!--
        State:

        A <link linkend="MMCallState">MMCallState</link> value,
        describing the state of the call.
    -->
    <property name="State" type="i" access="read" />

    <!--
        StateReason:

        A <link linkend="MMCallStateReason">MMCallStateReason</link> value, describing why the state is changed.
    -->
    <property name="StateReason" type="i" access="read" />

    <!--
        Direction:

        A <link linkend="MMCallDirection">MMCallDirection</link> value,
        describing the direction of the call.
    -->
    <property name="Direction" type="i" access="read" />

    <!--
        Number:

        The remote phone number.
    -->
    <property name="Number" type="s" access="read" />
  </interface>
</node>