Polycom 1500 Administrator's Manual page 1158

RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator's Guide
To enable DTLS negotiation for content encryption:
1 In a new or existing Profile, click the Advanced tab.
2 Set Encryption to either Encrypt All or Encrypt when possible.
3 Set the FORCE_ENCRYPTION_FOR_UNDEFINED_PARTICIPANT_IN_WHEN_
AVAILABLE_MODE System Flag to NO
These setting will enable encrypted and non-encrypted H.323 participants to connect to encrypted or
non-encrypted conferences.
For more information see Encryption.
Polycom®, Inc. 1126