A detailed discussion of the client’s config.xml file. This document shows you how to configure the client to work to your liking, and what options are available.

    Note: Since 0.81 the config.xml is cached by the BigBlueButton server for any active meeting. That is, making a change to the config.xml and refreshing the browser will not load the new config.xml. To see the results of editing the config.xml, create a new meeting and join it, or restart the BigBlueButton server.


    The config.xml file is located in the deployed client directory, the default location is /var/www/bigbluebutton/client/conf/config.xml. If you are working with the source code, it is located in the client’s src/conf directory, the default location is ~/dev/source/bigbluebutton/bigbluebutton-client/src/conf/config.xml.

    Open up the config.xml file. This is a line by line discussion of it’s properties, applicable for version 0.9.0.

    The template can be found here.

    Main parameters

    <localeversion suppressWarning="false">0.9.0</localeversion>
    <help url="http://HOST/help.html"/>
    <porttest host="HOST" application="video/portTest" timeout="10000"/>
    <application uri="rtmp://HOST/bigbluebutton" host="http://HOST/bigbluebutton/api/enter" />
    <language userSelectionEnabled="true" />
    <skinning enabled="true" url="branding/css/theme.css.swf" />
    <shortcutKeys showButton="true" />
    <browserVersions chrome="CHROME_VERSION" firefox="FIREFOX_VERSION" flash="FLASH_VERSION" java="1.7.0_51" />
    <layout showLogButton="false" defaultLayout=""
        showToolbar="true" showFooter="true" showMeetingName="true" showHelpButton="true"
        showLogoutWindow="true" showLayoutTools="true" confirmLogout="true"
    <meeting muteOnStart="false" />
    <lock disableCamForLockedUsers="false" disableMicForLockedUsers="false" disablePrivateChatForLockedUsers="false"
        disablePublicChatForLockedUsers="false" lockLayoutForLockedUsers="false" lockOnJoin="true"
    <localeversion suppressWarning="false">0.9.0</localeversion>

    This should be left as is. It has to do with the client caching localization files. If you’re having problems with the Warning Dialog for old localizations, you can set the suppressWarning parameter to true.


    This has to do with the caching of the client as a whole. Should also be left alone, in general.

    <help url="http://HOST/help.html"/>

    This is the URL that you would like users redirected to when they click the Help button in the client.

    <porttest host="HOST" application="video/portTest" timeout="10000"/>

    The IP and Red5 application the client uses to test whether necessary ports are open, and determine whether tunnelling should be used. The host should be your BBB server IP. The application should be left as is.

    <application uri="rtmp://HOST/bigbluebutton" host="http://HOST/bigbluebutton/api/enter" />

    The URL that the client queries for the user’s information when the user joins a meeting.

    <language userSelectionEnabled="true" />

    This enables/disables the language selector combo box in the client. Enable this if you would like your users to be able to select the language of their BigBlueButton client themselves instead of the language being detected automatically for them.

    <skinning enabled="true" url="branding/css/theme.css.swf" />

    Set enabled to true and set the url to the SWF file with your theme modifications. This enables/disables skinning support for the client. If the value is false, the url attribute will be ignored. Otherwise the url attribute specifies the compiled CSS file to load on startup. See Branding for more details.

    <shortcutKeys showButton="true" />

    This disables/enables the visibility of the Shortcut Keys button. It should be left as true.

    <browserVersions chrome="CHROME_VERSION" firefox="FIREFOX_VERSION" flash="FLASH_VERSION" java="1.7.0_51" />

    This is used to determine whether a browser or plugin is out-of-date. The values are filled in when the client is packaged, but can be changed manually.

    <layout showLogButton="false" defaultLayout=""
                showToolbar="true" showFooter="true" showMeetingName="true" showHelpButton="true" 
                showLogoutWindow="true" showLayoutTools="true" confirmLogout="true"
    Name Default Value Description
    showLogButton false Show or hide the button (lower right-hand corner) to display the debug window.
    defaultLayout Determine which layout to load by default.
    showToolbar true Show or hide the main toolbar on the top part of the client.
    showFooter true Show or hide the footer bar at the bottom of the client.
    showMeetingName true Show or hide the meeting name that is in the top toolbar.
    showHelpButton true Show the help button on the main toolbar.
    showLogoutWindow true Show the logout window when the client logs out.
    confirmLogout true Show a confirmation pop-up when a user wishes to logout.
    showRecordingNotification true Show or hide a notification on the top toolbar when recording is active.
    <meeting muteOnStart="false" />

    This determines whether people should join the audio muted by default.

    <lock disableCamForLockedUsers="false" disableMicForLockedUsers="false" disablePrivateChatForLockedUsers="false" 
        disablePublicChatForLockedUsers="false" lockLayoutForLockedUsers="false" lockOnJoin="true" lockOnJoinConfigurable="false"/>
    Name Default Value Description
    disableCamForLockedUsers false Default camera lock state for users that have been locked.
    disableMicForLockedUsers false Default microphone lock state for users that have been locked.
    disablePrivateChatForLockedUsers false Default private chat lock state for users that have been locked.
    disablePublicChatForLockedUsers false Default public chat lock state for users that have been locked.
    lockLayoutForLockedUsers false Default layout lock state for users that have been locked.
    lockOnJoin true Lock users when they join.
    lockOnJoinConfigurable false Show or hide the check box for lock-on-join.


    The BigBlueButton client is comprised of one or more modules. You can specify which modules you would like loaded in the config.xml file. The modules will be loaded at startup. The properties for the different currently available modules are shown here in no particular order. Most of the modules share certain attributes:


    Name Description
    name The unique name of the module
    url The url to the compiled module .swf file. Usually has a version appended to it, to prevent caching of old version when a new version of BigBlueButton is released.
    uri The uri the module will connect to using rtmp. This is usually your bbb server ip with /bigbluebutton appended to it. Apart from making sure the ip is correct, you don’t have to worry about it.
    dependsOn Optional parameter that should be included in the case that the module being loaded depends on another BigBlueButton module being loaded first in order to work properly.
    position Location of module on the screen. There are a number of pre-defined positions that you can assign a module to change its layout. This is superseded by the Layout Module.

    Chat Module

    <module name="ChatModule" url="http://HOST/client/ChatModule.swf?v=VERSION" 
    Name Default Value Description
    privateEnabled true Set to true to enable private chat.
    fontSize 12 Set the default size of the chat messages.
    colorPickerIsVisible false Show or hide the chat message color picker.

    Users Module

    <module name="UsersModule" url="http://HOST/client/UsersModule.swf?v=VERSION"
    Name Default Value Description
    allowKickUser false Determines whether or not the Moderators of the meeting are able to eject a user from the conference. If set to true, a Moderator will be given the option of ejecting a selected user from the conference by clicking on their Kick button inside the Users window.
    enableRaiseHand true Show or hide the raise hand button.
    enableSettingsButton true Show or hide the the settings button.

    Desktop Sharing

    <module name="DeskShareModule"

    The Desktop Sharing module. Note that it connects to /deskShare, which is a red5 application on the server separate from the /bigbluebutton application.

    Name Default Value Description
    showButton true Show or hide the button that is added to the toolbar for the presenter.
    autoStart false Set to true to automatically start the desktop sharing module.
    autoFullScreen false  

    Phone Module

    <module name="PhoneModule" url="http://HOST/client/PhoneModule.swf?v=VERSION"

    The Phone Module shows as the small headset icon in the upper left of the client. It allows users to join the meeting through VoIP by using a headset. Note again the client connect to /sip instead of /bigbluebutton on the server side.

    Name Default Value Description
    autoJoin true Set to true to have the user automatically join the voice conference.
    listenOnlyMode true Shows or hides listen-only mode as an option for audio.
    presenterShareOnly false If true, only the presenter may join with a microphone.
    skipCheck false Skip checking if user has working microphone.
    showButton true Set to true to have the headset icon visible on the toolbar.
    enabledEchoCancel true Set to true to enable the acoustic echo cancellation.
    useWebRTCIfAvailable true If true, then on Firefox and Chrome browsers the client will try to use WebRTC.
    showPhoneOption false Show or hide a third option for a dial-in number.
    echoTestApp 9196 The pin number to use for the echo test. Do not change.

    Videoconf Module

    <module name="VideoconfModule" url="http://HOST/client/VideoconfModule.swf?v=VERSION" 
    	dependson = "UsersModule"
    	videoQuality = "100"
    	presenterShareOnly = "false"
    	controlsForPresenter = "false"
    	resolutions = "320x240,640x480,1280x720"
    	autoStart = "false"
    	showButton = "true"
    	showCloseButton = "true"
    	publishWindowVisible = "true"
    	viewerWindowMaxed = "false"
    	viewerWindowLocation = "top"
    	camKeyFrameInterval = "30"
    	camModeFps = "10"
    	camQualityBandwidth = "0"
    	camQualityPicture = "90"
    	convolutionFilter="-1, 0, -1, 0, 6, 0, -1, 0, -1"
    	enableH264 = "true"
    	h264Level = "2.1"
    	h264Profile = "main"        
    	displayAvatar = "false"
    	focusTalking = "false"
    	glowColor = "0x4A931D"
    	glowBlurSize = "30.0"   

    The Video Conferencing Module. Allows users to share their webcams with the room. It connects to the separate /video application on the bbb server. See also changing quality of webcam picture in the FAQ.

    Name Default Value Description
    presenterShareOnly false If set to true, only the presenter will have the option of sharing their webcam. This is useful in one-to-many meetings, where there is one presenter that everyone should be focusing on, such as a webcast or a virtual classroom.
    resolutions 320x240,640x480,1280x720 Configure the resolutions you want the user to choose from.
    autoStart false Start the webcam automatically. This will choose the first option in the resolutions entry.
    showButton true Show button in main toolbar.
    publishWindowVisible true Make the webcam publish window visible. If you set to false, you need to make autoStart to true. Otherwise, you won’t be able to start camera.
    viewerWindowMaxed false Maximize the webcam viewer window.
    viewerWindowLocation top Set the preferred location of the viewer window when it pops up.
    camKeyFrameInterval 30 See Camera doc
    camModeFps 10 See Camera doc
    camQualityBandwidth 0 See Camera doc
    camQualityPicture 90 See Camera doc
    smoothVideo false See Camera doc
    applyConvolutionFilter false See Camera doc
    convolutionFilter -1, 0, -1, 0, 6, 0, -1, 0, -1 See Camera doc
    filterBias 0 See Camera doc
    filterDivisor 4 See Camera doc
    enableH264 true See Camera doc
    h264Level 2.1 See H264 Level
    h264Profile main See H264 Profile
    displayAvatar false Display avatar in webcam window.
    focusTalking false Make speaker window bigger.
    glowColor 0x4A931D Glow color surrounding webcam window of user that’s talking.
    glowBlurSize 30.0 How much to glow.

    Present Module

    <module name="PresentModule" url="http://HOST/client/PresentModule.swf?v=VERSION"

    The Presentation Module which lets users share slides and other documents in the main viewing area inside of BigBlueButton.

    Name Default Value Description
    showPresentWindow true Set true to show the presentation window.
    showWindowControls true Set true to show the presentation window controls.
    openExternalFileUploadDialog false  
    maxFileSize 30  

    Whiteboard Module

    <module name="WhiteboardModule" url="http://HOST/client/WhiteboardModule.swf?v=VERSION" 

    The Whiteboard Module is a transparent overlaid canvas on top of the presentation window. It allows users to draw annotations on top of uploaded slides and documents.

    Name Default Value Description
    keepToolbarVisible false Always show the whiteboard toolbar to the presenter instead of just when the Presentation window is moused over.


    Layouts documentation

    The layouts are defined in XML format, and the default layouts file is located at /var/www/bigbluebutton/client/conf/layout.xml.

    The format is as follows:

        <layout name=”LAYOUT_NAME” ... >
            <window name=”WINDOW_NAME” ... />
            <window ... />
        <layout ... />

    Layout parameters

    Name Default Value Description
    name   This is the name that will appear in the list of layouts on BigBlueButton
    default false Only one layout in the entire definition should be the default one (that will organize the windows on startup).
    role viewer This parameter make possible to define multiple layouts with the same name but with different definitions depending on the participant role. They must have the same name to assign them together. Values are “viewer”, “moderator” and “presenter”.

    Window parameters

    Name Required / Optional Type Description
    name Required String This is the window identifier. Example: PresentationWindow, VideoDock, ChatWindow, UsersWindow.
    width Required (optional only if hidden=”true” or minimized=”true”) Number The width of the window relative to the canvas. Values are [0..1].
    height Required (optional only if hidden=”true” or minimized=”true”) Number The height of the window relative to the canvas. Values are [0..1].
    x Required (optional only if hidden=”true” or minimized=”true”) Number The x position of the window relative to the canvas. Values are [0..1].
    y Required (optional only if hidden=”true” or minimized=”true”) Number The y position of the window relative to the canvas. Values are [0..1].
    order Optional Number Specifies the z order of the window, i.e, which window is in front of the others.
    hidden Optional (default is “false”) Boolean If hidden=”true” the window won’t show up in the BigBlueButton interface.
    minimized Optional (default is “false”) Boolean If minimized=”true” the window will be minimized at the left bottom corner and can be restored.
    maximized Optional (default is “false”) Boolean If maximized=”true” the window will be maximized to use the entire screen.
    minWidth Optional Number The minimum width of the window expressed in pixels.
    minHeight Optional Number The minimum height of the window expressed in pixels. Not implemented yet.
    draggable Optional Boolean Not implemented yet.
    resizable Optional Boolean Not implemented yet.

    You can have multiple layout definitions, and inside each layout, multiple window layout definitions.


    <layout name="Default minWidth">
    <window name="PresentationWindow" width="0.5137481910274964" height="0.9946808510638298" x="0.18017366136034732" y="0" />
        <window name="VideoDock" width="0.1772793053545586" height="0.30851063829787234" x="0" y="0.6875" minWidth="280" />
        <window name="ChatWindow" width="0.3031837916063676" height="0.9960106382978723" x="0.6968162083936325" y="0" />
        <window name="UsersWindow" width="0.1772793053545586" height="0.6795212765957446" x="0" y="0" minWidth="280" />

    Configuration on config.xml:

    Name Required / Optional Type Description
    layoutConfig Required String URL of the layouts definition file.
    enableEdit Required (default is “false”) Boolean Enable the buttons for moderators to manage layouts within the session. The buttons enable the moderator to add custom layouts to the list, save layouts to file and load layouts back from file.

    This is the moderator view when enableEdit=”true”.

    When the moderator clicks on the “lock layout” button, every participant will see the same layout and won’t be able to change it (except for moderators). New layouts can be created using the “add layout to list” button. Sysadmins always have the possibility to create a new layout, save it to file, edit is using a text editor to insert constraints like minWidth, and then copy this new layout to the default layouts definition file (/var/www/bigbluebutton/client/conf/layout.xml).

    Example of the layouts module definition on config.xml:

    <module name="LayoutModule"