TANDBERG MOVI 4.0 - ADMINISTRATOR GUIDE 10-2010 Administrator's Manual - page 20
Running Movi
TANDBERG Movi Administrator guide
Page 20 of 23
Note: If the bandwidth available is less than 192kbps and the far end supports G.722.1 at 24kbps, Movi will
send that protocol in order to free up bandwidth for better video quality.
Video
H.264
H.263+
H.263
Far-end camera control and ICE negotiation
Once the call has been established, far-end camera control (FECC) and ICE are negotiated if enabled and
supported by both call participants.
FECC negotiations may take several seconds. The FECC button in the Movi client is enabled once
negotiations are complete.
ICE negotiations take a couple of seconds and require nine TURN server licenses; one license for each
media link.
During a call
Once a call has been set up, there are a number of actions that can be prompted in Movi, either as a result
of a user action or as an automated response to changing conditions.
Multiway Initiation
Multiway is the ability for a user to join calls and seamlessly create a multi-participant conference. If multiway
is initiated by the user, the current call is put on hold (there has to be at least one other call already on hold)
and all the endpoints are redirected to a multi-conference system according to the Multiway Participant URI
Provisioning option.
Muting media streams
If the camera or microphone is muted, Movi allocates the bandwidth for the other media links to use. This
means that if the user does not have enough bandwidth for two video streams, it is possible to mute one
video stream and improve the quality of the other stream.
To prevent the unused link from being closed (for example by a firewall), Movi sends STUN keep alive
messages every 7 seconds.
Automatic bandwidth adaptation
In case of a Movi client sending or receiving bandwidth which exceeds the network capabilities, high packet
loss may occur and the user may experience poor call quality. Movi uses automatic bandwidth adaptation
mechanisms to tackle bandwidth issues.
Note: Automatic adaptations take time. Configuring the client to fit the network and system capabilities is
always recommended.
Automatic CPU adaptation
Running Movi with the highest video quality on a less powerful computer might result in 100% CPU usage
and a poor call quality. Movi monitors the CPU usage of the computer.
The following happens if CPU usage exceeds 95% for 10 seconds or more:
If Movi is responsible for less than 90% of the CPU usage: Movi displays a warning asking the user to
close other applications.
If Movi is responsible for 90% or more of the CPU usage: Movi lowers the resolution for outgoing video.