Polycom RealPresence 1800 Administration Manual page 433

 Cisco CUCM Version 9.0
 Cisco TPC Version 2.3
 Cisco endpoints running Version 1.9.1
 C20, C40, C60, and C90 running TC5
 CTS500
 CTS1310
 CTS3010
To enable DTLS negotiation for content encryption:
1 In a new or existing Profile, open the Advanced tab.
2 Set Encryption to either Encrypt All or Encrypt when possible.
3 Set 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.
a Open the Video Quality tab.
Polycom, Inc.
Appendix - Polycom Open Collaboration Network (POCN)
412