Package com.opentok

Class OpenTok

java.lang.Object
com.opentok.OpenTok

public class OpenTok
extends java.lang.Object
Contains methods for creating OpenTok sessions, generating tokens, and working with archives.

To create a new OpenTok object, call the OpenTok constructor with your OpenTok API key and the API secret for your Vonage Video API account. Do not publicly share your API secret. You will use it with the OpenTok constructor (only on your web server) to create OpenTok sessions.

Be sure to include the entire OpenTok server SDK on your web server.

  • Nested Class Summary

    Nested Classes 
    Modifier and Type Class Description
    static class  OpenTok.Builder
    Used to create an OpenTok object with advanced settings.
  • Constructor Summary

    Constructors 
    Constructor Description
    OpenTok​(int apiKey, java.lang.String apiSecret)
    Creates an OpenTok object.
  • Method Summary

    Modifier and Type Method Description
    void addArchiveStream​(java.lang.String archiveId, java.lang.String streamId, boolean hasAudio, boolean hasVideo)
    Adds a stream to an OpenTok archive.
    void addBroadcastStream​(java.lang.String broadcastId, java.lang.String streamId, boolean hasAudio, boolean hasVideo)
    Adds a stream to an Opentok broadcast.
    void close()
    Call this method when you are done using the OpenTok object, to prevent leaked file descriptors.
    Session createSession()
    Creates an OpenTok session with the default settings:
    Session createSession​(SessionProperties properties)
    Creates a new OpenTok session.
    void deleteArchive​(java.lang.String archiveId)
    Deletes an OpenTok archive.
    Sip dial​(java.lang.String sessionId, java.lang.String token, SipProperties properties)
    Dials a SIP gateway to connect it an OpenTok session.
    void disableForceMute​(java.lang.String sessionId)
    Disables the active mute state of the session.
    void forceDisconnect​(java.lang.String sessionId, java.lang.String connectionId)
    Disconnect a client from an OpenTok session
    void forceMuteAll​(java.lang.String sessionId, MuteAllProperties properties)
    Forces all streams (except for an optional array of streams) in a session to mute published audio.
    void forceMuteStream​(java.lang.String sessionId, java.lang.String streamId)
    Force the publisher of a specific stream to mute its audio.
    java.lang.String generateToken​(java.lang.String sessionId)
    Creates a token for connecting to an OpenTok session, using the default settings.
    java.lang.String generateToken​(java.lang.String sessionId, TokenOptions tokenOptions)
    Creates a token for connecting to an OpenTok session.
    Archive getArchive​(java.lang.String archiveId)
    Gets an Archive object for the given archive ID.
    Broadcast getBroadcast​(java.lang.String broadcastId)
    Gets an Broadcast object for the given broadcast ID.
    Stream getStream​(java.lang.String sessionId, java.lang.String streamId)
    Gets a Stream object for the given session ID and stream ID.
    ArchiveList listArchives()
    Returns a List of Archive objects, representing archives that are both both completed and in-progress, for your API key.
    ArchiveList listArchives​(int offset, int count)
    Returns a List of Archive objects, representing archives that are both both completed and in-progress, for your API key.
    ArchiveList listArchives​(java.lang.String sessionId)
    Returns a List of Archive objects, representing archives that are both both completed and in-progress, for your API key.
    ArchiveList listArchives​(java.lang.String sessionId, int offset, int count)
    Returns a List of Archive objects, representing archives that are both both completed and in-progress, for your API key.
    StreamList listStreams​(java.lang.String sessionId)
    Gets a list of Stream objects for the given session ID.
    void playDTMF​(java.lang.String sessionId, java.lang.String dtmfDigits)
    Send DTMF digits to all clients in a session.
    void playDTMF​(java.lang.String sessionId, java.lang.String connectionId, java.lang.String dtmfDigits)
    Send DTMF digits a specific client in a session.
    void removeArchiveStream​(java.lang.String archiveId, java.lang.String streamId)
    Removes a stream from an Opentok archive.
    void removeBroadcastStream​(java.lang.String broadcastId, java.lang.String streamId)
    Removes a stream from an Opentok broadcast.
    void setArchiveLayout​(java.lang.String archiveId, ArchiveProperties properties)
    Sets the layout type for a composed archive.
    void setBroadcastLayout​(java.lang.String broadcastId, BroadcastProperties properties)
    Sets the layout type for the broadcast.
    void setStreamLayouts​(java.lang.String sessionId, StreamListProperties properties)
    Sets the layout class list for streams in a session.
    void signal​(java.lang.String sessionId, SignalProperties props)
    Sends a signal to all clients connected to a session.
    void signal​(java.lang.String sessionId, java.lang.String connectionId, SignalProperties props)
    Sends a signal to a specific client connected to a session.
    Archive startArchive​(java.lang.String sessionId)  
    Archive startArchive​(java.lang.String sessionId, ArchiveProperties properties)
    Starts archiving an OpenTok session.
    Archive startArchive​(java.lang.String sessionId, java.lang.String name)  
    Broadcast startBroadcast​(java.lang.String sessionId, BroadcastProperties properties)
    Use this method to start a live streaming for an OpenTok session.
    Archive stopArchive​(java.lang.String archiveId)
    Stops an OpenTok archive that is being recorded.
    Broadcast stopBroadcast​(java.lang.String broadcastId)
    Use this method to stop a live broadcast of an OpenTok session.

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Constructor Details

  • Method Details

    • generateToken

      public java.lang.String generateToken​(java.lang.String sessionId, TokenOptions tokenOptions) throws OpenTokException
      Creates a token for connecting to an OpenTok session. In order to authenticate a user connecting to an OpenTok session, the client passes a token when connecting to the session.

      The following example shows how to obtain a token that has a role of "subscriber" and that has a connection metadata string:

       import com.opentok.Role;
       import com.opentok.TokenOptions;
      
       class Test {
           public static void main(String argv[]) throws OpenTokException {
               int API_KEY = 0; // Replace with your OpenTok API key (see https://tokbox.com/account).
               String API_SECRET = ""; // Replace with your OpenTok API secret.
               OpenTok sdk = new OpenTok(API_KEY, API_SECRET);
      
               //Generate a basic session. Or you could use an existing session ID.
               String sessionId = System.out.println(sdk.createSession());
      
               // Replace with meaningful metadata for the connection.
               String connectionMetadata = "username=Bob,userLevel=4";
      
               // Use the Role value appropriate for the user.
               String role = Role.SUBSCRIBER;
      
               // Generate a token:
               TokenOptions options = new TokenOptions.Buider().role(role).data(connectionMetadata).build();
               String token = sdk.generateToken(sessionId, options);
               System.out.println(token);
           }
       }
       

      For testing, you can also generate tokens by logging in to your Vonage Video API account.

      Parameters:
      sessionId - The session ID corresponding to the session to which the user will connect.
      tokenOptions - This TokenOptions object defines options for the token. These include the following:
      • The role of the token (subscriber, publisher, or moderator)
      • The expiration time of the token
      • Connection data describing the end-user
      Returns:
      The token string.
      Throws:
      OpenTokException
    • generateToken

      public java.lang.String generateToken​(java.lang.String sessionId) throws OpenTokException
      Creates a token for connecting to an OpenTok session, using the default settings. The default settings are the following:
      • The token is assigned the role of publisher.
      • The token expires 24 hours after it is created.
      • The token includes no connection data.

      The following example shows how to generate a token that has the default settings:

       import com.opentok.OpenTok;
      
       class Test {
           public static void main(String argv[]) throws OpenTokException {
               int API_KEY = 0; // Replace with your OpenTok API key (see https://tokbox.com/account).
               String API_SECRET = ""; // Replace with your OpenTok API secret.
               OpenTok sdk = new OpenTok(API_KEY, API_SECRET);
      
               //Generate a basic session. Or you could use an existing session ID.
               String sessionId = System.out.println(sdk.createSession().getSessionId());
      
               String token = sdk.generateToken(sessionId);
               System.out.println(token);
           }
       }
       
      Parameters:
      sessionId - The session ID corresponding to the session to which the user will connect.
      Returns:
      The token string.
      Throws:
      OpenTokException
      See Also:
      generateToken(String, TokenOptions)
    • createSession

      public Session createSession​(SessionProperties properties) throws OpenTokException
      Creates a new OpenTok session.

      For example, when using the OpenTok.js library, use the session ID when calling the OT.initSession() method (to initialize an OpenTok session).

      OpenTok sessions do not expire. However, authentication tokens do expire (see the generateToken(String, TokenOptions) method). Also note that sessions cannot explicitly be destroyed.

      A session ID string can be up to 255 characters long.

      Calling this method results in an OpenTokException in the event of an error. Check the error message for details.

      The following code creates a session that attempts to send streams directly between clients (falling back to use the OpenTok TURN server to relay streams if the clients cannot connect):

       import com.opentok.MediaMode;
       import com.opentok.OpenTok;
       import com.opentok.Session;
       import com.opentok.SessionProperties;
      
       class Test {
           public static void main(String argv[]) throws OpenTokException {
               int API_KEY = 0; // Replace with your OpenTok API key.
               String API_SECRET = ""; // Replace with your OpenTok API secret.
               OpenTok sdk = new OpenTok(API_KEY, API_SECRET);
      
               SessionProperties sp = new SessionProperties().Builder()
                 .mediaMode(MediaMode.RELAYED).build();
      
               Session session = sdk.createSession(sp);
               System.out.println(session.getSessionId());
           }
       }
       
      You can also create a session using the OpenTok REST API or or by logging in to your Vonage Video API account.
      Parameters:
      properties - This SessionProperties object defines options for the session. These include the following:
      • Whether the session's streams will be transmitted directly between peers or using the OpenTok Media Router.
      • A location hint for the location of the OpenTok server to use for the session.
      Returns:
      A Session object representing the new session. Call the getSessionId() method of the Session object to get the session ID, which uniquely identifies the session. You will use this session ID in the client SDKs to identify the session.
      Throws:
      OpenTokException
    • createSession

      public Session createSession() throws OpenTokException
      Creates an OpenTok session with the default settings:

      • The media mode is "relayed". The session will attempt to transmit streams directly between clients. If two clients cannot send and receive each others' streams, due to firewalls on the clients' networks, their streams will be relayed using the OpenTok TURN Server.
      • The session uses the first client connecting to determine the location of the OpenTok server to use.

      The following example creates a session that uses the default settings:

       import com.opentok.OpenTok;
       import com.opentok.SessionProperties;
      
       class Test {
           public static void main(String argv[]) throws OpenTokException {
               int API_KEY = 0; // Replace with your OpenTok API key.
               String API_SECRET = ""; // Replace with your OpenTok API secret.
               OpenTok sdk = new OpenTok(API_KEY, API_SECRET);
      
               String sessionId = sdk.createSession();
               System.out.println(sessionId);
           }
       }
       
      Returns:
      A Session object representing the new session. Call the getSessionId() method of the Session object to get the session ID, which uniquely identifies the session. You will use this session ID in the client SDKs to identify the session.
      Throws:
      OpenTokException
      See Also:
      createSession(SessionProperties)
    • signal

      public void signal​(java.lang.String sessionId, SignalProperties props) throws OpenTokException, RequestException, InvalidArgumentException
      Sends a signal to all clients connected to a session.

      For more information, see the Signaling developer guide.

      Parameters:
      sessionId - The session ID.
      props - The SignalProperties object that defines the data and type of the signal.
      Throws:
      OpenTokException
      RequestException
      InvalidArgumentException
    • signal

      public void signal​(java.lang.String sessionId, java.lang.String connectionId, SignalProperties props) throws OpenTokException, RequestException, InvalidArgumentException
      Sends a signal to a specific client connected to a session.

      For more information, see the Signaling developer guide.

      Parameters:
      sessionId - The session ID.
      sessionId - The connection ID of the client to receive the signal.
      props - The SignalProperties object that defines the data and type of the signal.
      Throws:
      OpenTokException
      RequestException
      InvalidArgumentException
    • getArchive

      public Archive getArchive​(java.lang.String archiveId) throws OpenTokException
      Gets an Archive object for the given archive ID.
      Parameters:
      archiveId - The archive ID.
      Returns:
      The Archive object.
      Throws:
      OpenTokException
    • listArchives

      public ArchiveList listArchives() throws OpenTokException
      Returns a List of Archive objects, representing archives that are both both completed and in-progress, for your API key. This list is limited to 1000 archives starting with the first archive recorded. For a specific range of archives, call listArchives(int offset, int count).
      Returns:
      A List of Archive objects.
      Throws:
      OpenTokException
    • listArchives

      public ArchiveList listArchives​(java.lang.String sessionId) throws OpenTokException
      Returns a List of Archive objects, representing archives that are both both completed and in-progress, for your API key.
      Parameters:
      sessionId - The sessionid of the session which started or automatically enabled archiving. If the session is null or empty it will be omitted.
      Returns:
      A List of Archive objects.
      Throws:
      OpenTokException
    • listArchives

      public ArchiveList listArchives​(int offset, int count) throws OpenTokException
      Returns a List of Archive objects, representing archives that are both both completed and in-progress, for your API key.
      Parameters:
      offset - The index offset of the first archive. 0 is offset of the most recently started archive. 1 is the offset of the archive that started prior to the most recent archive.
      count - The number of archives to be returned. The maximum number of archives returned is 1000.
      Returns:
      A List of Archive objects.
      Throws:
      OpenTokException
    • listArchives

      public ArchiveList listArchives​(java.lang.String sessionId, int offset, int count) throws OpenTokException
      Returns a List of Archive objects, representing archives that are both both completed and in-progress, for your API key.
      Parameters:
      offset - The index offset of the first archive. 0 is offset of the most recently started archive. 1 is the offset of the archive that started prior to the most recent archive.
      count - The number of archives to be returned. The maximum number of archives returned is 1000.
      sessionId - The sessionid of the session which started or automatically enabled archiving.
      Returns:
      A List of Archive objects.
      Throws:
      OpenTokException
    • startArchive

      public Archive startArchive​(java.lang.String sessionId, ArchiveProperties properties) throws OpenTokException
      Starts archiving an OpenTok session. This version of the startArchive() method lets you disable audio or video recording.

      Clients must be actively connected to the OpenTok session for you to successfully start recording an archive.

      You can only record one archive at a time for a given session. You can only record archives of sessions that use the OpenTok Media Router (sessions with the media mode set to routed); you cannot archive sessions with the media mode set to relayed.

      For more information on archiving, see the OpenTok archiving developer guide.

      Parameters:
      sessionId - The session ID of the OpenTok session to archive.
      properties - This ArchiveProperties object defines options for the archive.
      Returns:
      The Archive object. This object includes properties defining the archive, including the archive ID.
      Throws:
      OpenTokException
    • startArchive

      public Archive startArchive​(java.lang.String sessionId) throws OpenTokException
      Throws:
      OpenTokException
    • startArchive

      public Archive startArchive​(java.lang.String sessionId, java.lang.String name) throws OpenTokException
      Throws:
      OpenTokException
    • stopArchive

      public Archive stopArchive​(java.lang.String archiveId) throws OpenTokException
      Stops an OpenTok archive that is being recorded.

      Archives automatically stop recording after 120 minutes or when all clients have disconnected from the session being archived.

      Parameters:
      archiveId - The archive ID of the archive you want to stop recording.
      Returns:
      The Archive object corresponding to the archive being stopped.
      Throws:
      OpenTokException
    • deleteArchive

      public void deleteArchive​(java.lang.String archiveId) throws OpenTokException
      Deletes an OpenTok archive.

      You can only delete an archive which has a status of "available" or "uploaded". Deleting an archive removes its record from the list of archives. For an "available" archive, it also removes the archive file, making it unavailable for download.

      Parameters:
      archiveId - The archive ID of the archive you want to delete.
      Throws:
      OpenTokException
    • addArchiveStream

      public void addArchiveStream​(java.lang.String archiveId, java.lang.String streamId, boolean hasAudio, boolean hasVideo) throws OpenTokException
      Adds a stream to an OpenTok archive.

      This method only works for an archive that has a Archive.StreamMode set to StreamMode.MANUAL.

      You can call this method repeatedly with the same stream ID to enable and disable audio or video, based on the hasAudio and hasVideo parameter values.

      Parameters:
      archiveId - The archive ID.
      streamId - The stream ID.
      hasAudio - Whether the stream should have audio enabled in the archive.
      hasVideo - Whether the stream should have video enabled in the archive.
      Throws:
      OpenTokException
    • removeArchiveStream

      public void removeArchiveStream​(java.lang.String archiveId, java.lang.String streamId) throws OpenTokException
      Removes a stream from an Opentok archive.

      This method only works for an archive that has a Archive.StreamMode set to StreamMode.MANUAL.

      Parameters:
      archiveId - The archive ID.
      streamId - The stream ID.
      Throws:
      OpenTokException
    • setArchiveLayout

      public void setArchiveLayout​(java.lang.String archiveId, ArchiveProperties properties) throws OpenTokException
      Sets the layout type for a composed archive. For a description of layout types, see Customizing the video layout for composed archives.
      Parameters:
      archiveId - {String} The archive ID.
      properties - This ArchiveProperties object defining the arachive layout.
      Throws:
      OpenTokException
    • startBroadcast

      public Broadcast startBroadcast​(java.lang.String sessionId, BroadcastProperties properties) throws OpenTokException
      Use this method to start a live streaming for an OpenTok session. This broadcasts the session to an HLS (HTTP live streaming) or to RTMP streams.

      To successfully start broadcasting a session, at least one client must be connected to the session.

      You can only have one active live streaming broadcast at a time for a session (however, having more than one would not be useful). The live streaming broadcast can target one HLS endpoint and up to five RTMP servers simulteneously for a session. You can only start live streaming for sessions that use the OpenTok Media Router (with the media mode set to routed); you cannot use live streaming with sessions that have the media mode set to relayed OpenTok Media Router. See The OpenTok Media Router and media modes.

      For more information on broadcasting, see the Broadcast developer guide.

      Parameters:
      sessionId - The session ID of the OpenTok session to broadcast.
      properties - This BroadcastProperties object defines options for the broadcast.
      Returns:
      The Broadcast object. This object includes properties defining the broadcast, including the broadcast ID.
      Throws:
      OpenTokException
    • stopBroadcast

      public Broadcast stopBroadcast​(java.lang.String broadcastId) throws OpenTokException
      Use this method to stop a live broadcast of an OpenTok session. Note that broadcasts automatically stop 120 minutes after they are started.

      For more information on broadcasting, see the Broadcast developer guide.

      Parameters:
      broadcastId - The broadcast ID of the broadcasting session
      Returns:
      The Broadcast object. This object includes properties defining the archive, including the archive ID.
      Throws:
      OpenTokException
    • getBroadcast

      public Broadcast getBroadcast​(java.lang.String broadcastId) throws OpenTokException
      Gets an Broadcast object for the given broadcast ID.
      Parameters:
      broadcastId - The broadcast ID.
      Returns:
      The Broadcast object.
      Throws:
      OpenTokException
    • setBroadcastLayout

      public void setBroadcastLayout​(java.lang.String broadcastId, BroadcastProperties properties) throws OpenTokException
      Sets the layout type for the broadcast. For a description of layout types, see Configuring video layout for OpenTok live streaming broadcasts.
      Parameters:
      broadcastId - {String} The broadcast ID.
      properties - This BroadcastProperties object that defines layout options for the broadcast.
      Throws:
      OpenTokException
    • addBroadcastStream

      public void addBroadcastStream​(java.lang.String broadcastId, java.lang.String streamId, boolean hasAudio, boolean hasVideo) throws OpenTokException
      Adds a stream to an Opentok broadcast.

      This method only works for an archive that has a Archive.StreamMode set to StreamMode.MANUAL.

      You can call this method repeatedly with the same stream ID to enable and disable audio or video, based on the hasAudio and hasVideo parameter values.

      Parameters:
      broadcastId - The broadcast ID.
      streamId - The stream ID.
      hasAudio - Whether the stream should have audio enabled in the broadcast.
      hasVideo - Whether the stream should have video enabled in the broadcast.
      Throws:
      OpenTokException
    • removeBroadcastStream

      public void removeBroadcastStream​(java.lang.String broadcastId, java.lang.String streamId) throws OpenTokException
      Removes a stream from an Opentok broadcast.

      This method only works for an archive that has a Archive.StreamMode set to StreamMode.MANUAL.

      Parameters:
      broadcastId - The broadcast ID.
      streamId - The stream ID.
      Throws:
      OpenTokException
    • setStreamLayouts

      public void setStreamLayouts​(java.lang.String sessionId, StreamListProperties properties) throws OpenTokException
      Sets the layout class list for streams in a session. Layout classes are used in the layout for composed archives and live streaming broadcasts. For more information, see Customizing the video layout for composed archives and Configuring video layout for OpenTok live streaming broadcasts.

      You can set the initial layout class list for streams published by a client when you generate used by the client. See the generateToken(String, TokenOptions) method.

      Parameters:
      sessionId - {String} The session ID of the session the streams belong to.
      properties - This StreamListProperties object defines class lists for one or more streams in the session.
      Throws:
      OpenTokException
    • forceDisconnect

      public void forceDisconnect​(java.lang.String sessionId, java.lang.String connectionId) throws OpenTokException, InvalidArgumentException, RequestException
      Disconnect a client from an OpenTok session

      Use this API to forcibly terminate a connection of a session.

      Parameters:
      sessionId - The session ID of the connection
      connectionId - The connection ID to disconnect
      Throws:
      OpenTokException
      InvalidArgumentException
      RequestException
    • forceMuteStream

      public void forceMuteStream​(java.lang.String sessionId, java.lang.String streamId) throws OpenTokException
      Force the publisher of a specific stream to mute its audio.

      For more information, see Muting the audio of streams in a session.

      Parameters:
      sessionId - The session ID.
      streamId - The stream ID.
      Throws:
      OpenTokException
      See Also:
      forceMuteAll(String, MuteAllProperties)
    • forceMuteAll

      public void forceMuteAll​(java.lang.String sessionId, MuteAllProperties properties) throws OpenTokException
      Forces all streams (except for an optional array of streams) in a session to mute published audio.

      In addition to existing streams, any streams that are published after the call to this method are published with audio muted. You can remove the mute state of a session by calling the OpenTok.disableForceMute() method.

      For more information, see Muting the audio of streams in a session.

      Parameters:
      sessionId - The session ID.
      properties - Defines a list of stream IDs for streams that should be excluded from the mute action.
      Throws:
      OpenTokException
      See Also:
      forceMuteStream(String, String), disableForceMute(String)
    • disableForceMute

      public void disableForceMute​(java.lang.String sessionId) throws OpenTokException
      Disables the active mute state of the session. After you call this method, new streams published to the session will no longer have audio muted.

      After you call the OpenTok.forceMuteAll() method, any streams published after the call are published with audio muted. When you call the OpenTok.disableForceMute() method, future streams published to the session are not muted (but any existing muted streams remain muted).

      Parameters:
      sessionId - The session ID.
      Throws:
      OpenTokException
      See Also:
      forceMuteAll(String, MuteAllProperties)
    • getStream

      public Stream getStream​(java.lang.String sessionId, java.lang.String streamId) throws OpenTokException
      Gets a Stream object for the given session ID and stream ID.
      Parameters:
      sessionId - The session ID.
      streamId - The stream ID.
      Returns:
      The Stream object.
      Throws:
      OpenTokException
    • listStreams

      public StreamList listStreams​(java.lang.String sessionId) throws OpenTokException
      Gets a list of Stream objects for the given session ID.
      Parameters:
      sessionId - The session ID.
      Returns:
      The list of Stream objects.
      Throws:
      OpenTokException
    • dial

      public Sip dial​(java.lang.String sessionId, java.lang.String token, SipProperties properties) throws OpenTokException
      Dials a SIP gateway to connect it an OpenTok session.
      Parameters:
      sessionId - The session ID.
      token - OpenTok token to be used for the participant being called. You can add token data to identify that the participant is on a SIP endpoint or for other identifying data, such as phone numbers. (The OpenTok client libraries include properties for inspecting the connection data for a client connected to a session.) See the Token Creation developer guide. . *
      properties - The SipProperties object defining options for the SIP call.
      Returns:
      The Sip object.
      Throws:
      OpenTokException
    • playDTMF

      public void playDTMF​(java.lang.String sessionId, java.lang.String dtmfDigits) throws OpenTokException
      Send DTMF digits to all clients in a session.
      Parameters:
      sessionId - The session ID.
      dtmfDigits - The string of DTMF digits to send. This can include 0-9, "*", "#", and "p". A p indicates a pause of 500ms (if you need to add a delay in sending the digits).
      Throws:
      OpenTokException
    • playDTMF

      public void playDTMF​(java.lang.String sessionId, java.lang.String connectionId, java.lang.String dtmfDigits) throws OpenTokException
      Send DTMF digits a specific client in a session.
      Parameters:
      sessionId - The session ID.
      connectionId - The session ID of the client to receive the DTMF digits.
      dtmfDigits - The string of DTMF digits to send. This can include 0-9, "*", "#", and "p". A p indicates a pause of 500ms (if you need to add a delay in sending the digits).
      Throws:
      OpenTokException
    • close

      public void close()
      Call this method when you are done using the OpenTok object, to prevent leaked file descriptors.