RADVision SCOPIA XT1000 User Manual page 47

Video
In this menu you can configure a set of various functionalities that you can enable/disable,
to make the system compatible with older systems.
H.323
In this menu you can configure:

DTMF RFC2833 (H.323) to choose this mode of DTMF transmission as different
alternative to in band transmission

RTP Firewall enable a function that increases system security rejecting RTP packets not
"rightful" for the current call

Select dialing number format mode

Separator, to choose the desired separator for call through a gatekeeper
Video Quality
In this menu you can configure some parameters related to video quality:

Error resilience – In case of packet loss (due for example to network congestion) allows
minimizing error, so making the codec much "stronger".

Flow Control – A Flow Control (bandwidth reduction) request is sent to the remote
terminal, in case of packet loss.

Error strategies – To set the number of allowed line errors before video is frozen:

Min Fluency - Freezes video frames at the first occurred error,

Max Fluency - Never freezes video frames, and allows errors through

Automatic Lip Sync –
represents the value in milliseconds by which received audio is delayed.
To have perfect synchronization between audio and video, you must adjust these
parameters according to the connection type.
By selecting the check box (strongly recommended option), you allow the system to
perform this operation automatically. Alternatively, you can make manual adjustments
by moving the slider along the bar until you obtain the best synchronization.
RADVISION | User Guide
You can also synchronize audio with video. The audio delay
System Configuration Settings | 47