Asterisk ARI Conferencing Application: Allow / Request Pin Number

Question

I use the C # /. NET library to implement the Asterisk RESTful Interface (ARI) to create a conferencing application.

So far, the application works as follows:

• The user calls the number
• Application response
• The application starts voice recognition
• The application asks for a name and records audio
• The application adds the user to the conference

Requirements:

I need to add some authorization to the above process before the user is added to the conference. I need to implement a request for PIN functionality , create a PIN design, and if the caller enters the correct PIN, add the caller to the correct conference call.

Code:

The conference

    public Conference( AriClient c, Guid id, string name)
    {
        _client = c;
        Id = id;
        ConferenceName = name;
        State = ConferenceState.Destroyed;

        c.OnChannelDtmfReceivedEvent += c_OnChannelDtmfReceivedEvent; // ??
        c.OnBridgeCreatedEvent += c_OnBridgeCreatedEvent;
        c.OnChannelEnteredBridgeEvent += c_OnChannelEnteredBridgeEvent;
        c.OnBridgeDestroyedEvent += c_OnBridgeDestroyedEvent;
        c.OnChannelLeftBridgeEvent += c_OnChannelLeftBridgeEvent;
        c.OnRecordingFinishedEvent += c_OnRecordingFinishedEvent;

        // Added support for talk detection
        c.OnChannelTalkingStartedEvent += c_OnChannelTalkingStartedEvent;
        c.OnChannelTalkingFinishedEvent += c_OnChannelTalkingFinishedEvent;

        Debug.Print("Added Conference {0}", ConferenceName);
    }

OnChannelEnteredBridgeEvent:

private void c_OnChannelEnteredBridgeEvent(object sender, ChannelEnteredBridgeEvent e)
{
    ConferenceUser confUser = ConferenceUsers.SingleOrDefault(x => x.Channel.Id == e.Channel.Id);
    if (confUser == null) return;

    confUser.State = ConferenceUserState.InConf;

    if (ConferenceUsers.Count(x => x.State == ConferenceUserState.InConf) > 1) // are we the only ones here
    {
        // stop moh
        _client.Bridges.StopMoh(Confbridge.Id);

        // change state
        State = ConferenceState.Ready;

        // announce new user
        _client.Bridges.Play(Confbridge.Id, "recording:" + confUser.CurrentRecodingId, "en", 0, 0, Guid.NewGuid().ToString());
        _client.Bridges.Play(Confbridge.Id, "sound:conf-hasjoin", "en", 0, 0, Guid.NewGuid().ToString());
    }
    else
    {          
        // only caller in conf
        _client.Channels.Play(e.Channel.Id, "sound:conf-onlyperson", "en", 0, 0, Guid.NewGuid().ToString());
    }
}

StartConference:

    public bool StartConference()
    {

        // Create the conference bridge
        Debug.Print("Requesting new bridge {0} for {1}", Id, ConferenceName);
        Bridge bridge = _client.Bridges.Create("mixing", Id.ToString(), ConferenceName);

        if (bridge == null)
        {
            return false;
        }

        Debug.Print("Subscribing to events on bridge {0} for {1}", Id, ConferenceName);
        _client.Applications.Subscribe(AppConfig.AppName, "bridge:" + bridge.Id);

        // Start MOH on conf bridge
        _client.Bridges.StartMoh(bridge.Id, "default");

        // Default state is ReadyWaiting until MOH is turned off
        State = ConferenceState.ReadyWaiting;
        Confbridge = bridge;

        // Conference ready to accept calls
        State = ConferenceState.Ready;

        return true;
    }

AddUser:

    public bool AddUser(Channel c) //here check for pin and caller id
    {
        if (State == ConferenceState.Destroying)
            return false;
        if (State == ConferenceState.Destroyed)
        {
            // We should initiate a new conference bridge
            if (!StartConference())
                return false;
        }
        if (State < ConferenceState.Ready) return false;

        // Answer channel
        _client.Channels.Answer(c.Id);

        // Turn on talk detection on this channel
        _client.Channels.SetChannelVar(c.Id, "TALK_DETECT(set)", "");

        // Add conference user to collection
        ConferenceUsers.Add(new ConferenceUser(this, c, _client, ConferenceUserType.Normal));

        return true;
    }

Question:

How can I raise / raise the “ask pin number” event in the application and capture the entered DTMF digits into a variable?

Is it possible to do this only in my C # ARI application, or do I need to mess with .conf files on an Asterisk server?

My preferred way is to implement it in my C # ARI application, as this will give me more control over the conferences.

Answer 1

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