* Tries to improve the echo cancellation by reducing the effects of reverberation.
  * Other recent changes in earlier versions:
  * - Commits work in progress on improving echo cancellation.Attempts to shorten the adaptation time of the echo cancellation.
  * - Ensure that the received call dialog is close when the call state changes.
  * - Fixes a NullPointerException reported by Bauersachs Ingo in the dev mailing list thread "Exception creating media description when all video codecs disabled".
  * - Commits work in progress on improving echo cancellation.
  * - Allow to override the preferIPv6Address in the default settings.
  * - Check which is the default sip transport in default properites.
  * - Move g722 at first place in the list of preferred codec.
  * - Commits work in progress on improving echo cancellation. Attempts to better the matching of playback and capture which seems to reduce the far to near end delay. Since the drift is wildly varying, the echo canceller will still fail to deliver. (Which also means that there is no need to rebuild the respective native binaries.)
  * - Check for client default listen port in the default settings.
  * - Enable ICE by default, fix javadoc warnings.
  * - Changes the filter length of the Speex echo canceller to 200 ms. Adds javadocs, renames variables to rename readability.
  * - Show the contact status icon instead of using the protocol name. (See previous commit).
  * - Show protocol name in the list of contacts shown in merged contacts, when pressing the call button.
  * - Fix closing media when Bye has a reason string, fix missed and not overriden method.
  * - Check local hold state when we compute the direction to set on streams after receiving answer with sdp(invite ok or ack).
  * - Fix saving volume level.
  * - Disables the volume control before the call is established.
  * - Volume control user interface, allowing to adjust volume during a call.
  * - Source file for the new call history icons.
  * - Fix login with icq protocol after server changes.
  * - Close receive streams, even if rtp manager has no receive stream list, due to missing rtcp in media.
  * - Volume control implementation for media service.
  * - Enable Jingle to provide audio and video call with XMPP.
  * - Use size of the video stream in VideoEffect's native code rather than hardcoded 640x480.
  * - Fix invisible status and skip setting custom message status for empty status messages.
  * - Fix exception with registrarless SIP account.
  * - Removes the PortAudioManager class because its name is too generic, spreads its functionality across the DeviceConfiguration and PortAudio classes.
  * - Display correctly the local video if we switch from desktop streaming to webcam or vice-versa.
  * - Disable the local video button if no camera is available.
  * - Implement isLocalVideoAllowed in the Jabber implementation of OperationSetDesktopStreaming.
  * - The interfaces for the call playback volume control.