Polycom RealPresence Centro User Manual page 50

Procedure
1. Tap to open the Quick Access menu, then tap
2. From the Security Classification list, select the desired security level.
3. Click Continue to confirm your selection.
After the security classification is raised or lowered, a message displays for five seconds to all
video participants. The change is only applicable to the current call.
Verify Encryption Check Code
To provide extra security for encrypted H.323 calls, the system provides an encryption check code.
Participants in a call can use this check code to verify that the call is not being intercepted by a third party.
Polycom recommends verifying check codes at each site to protect against third-party eavesdropping on
H.323 point-to-point calls. The check code is calculated so that the check code is the same at both sites
in the call. The numbers are identical if, and only if, the calculation uses data exclusively from the two
sites in the call, with no data being intercepted and modified by a third party. Note that in externally-
hosted multipoint calls, check code numbers do not match any other numbers in the call.
Procedure
1. Place an encrypted H.323 point-to-point call.
2. Tap to open the Quick Access menu, then tap
Statistics.
3. On the Call Statistics screen, tap Call Statistics.
4. For Call Encryption, locate the check code, as shown in the following example: AES-128/TLS/
SDED
5. Verbally verify that the check code is the same at both sites.
6. Do one of the following:
• If the codes match, the call is secure. Proceed with the call.
• If the codes do not match, the call might be compromised. Hang up the call and contact your
system administrator.
Settings > Administration > Security.
Settings > System Information > Call
Settings
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