RADVision SCOPIA XT1000 User Manual page 48


Sharpness - Force use of high resolution formats at lower connection rates. Video
fluency can be affected.
Encryption
In this menu you can configure:

Accept protected calls – If encryption is not enabled, the system can in any case accept
encrypted incoming calls

Enable Encryption – If encryption is activated, the system will use encryption in H.323.

Unprotected calls – from this menu you can choose the policy the system will apply if
the remote terminal is not able to support protected calls.

Disconnect – The system will not allow connection with a remote terminal that does
not support encryption, and therefore automatically disconnects.

Ask Confirmation – During the session negotiation phase, the system will ask you to
confirm that you want to establish an unprotected call.

Inform – The system will inform you that you are about to establish an unprotected
connection by displaying a visual warning message.

Show Status – The system will notify you that you are about to establish an
unprotected call, and once the connection is established an open padlock symbol
will be displayed on the local information area.

Length of AES Key
The AES key length is set to 128 bits.
Note:
For an IP connection, the key length is always 128 bits.

Length of Prime DH Number
The encryption protocol requires the simultaneous exchange of a prime number and an AES
private key between terminals.
The prime number length is set to High Security (length 1024 bits).
For IP calls, the system always uses the High Security option with a 1024-bit
length.
Note:
Most common video communication terminals normally use the High Security
prime number length and the 128-bit AES private key.
RADVISION | User Guide System Configuration Settings | 48