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Meeting hosts or account administrators can set Require Encryption for 3rd Party Endpoints (H323/SIP) for all participants. When this option is selected, SIP/H.323 devices will be required to use encryption when dialing into a meeting.

How to connect to an encrypted meeting with a H.323/SIP device
You have two options to connect to this meeting when you receive this message:
- You can enable encryption on your SIP/H.323 device
- Start the meeting and turn off Require Encryption for 3rd Party Endpoints (H323/SIP). Discover how to disable it.
How to enable encryption on SIP/H.323 devices:
(pages 8-20 and 8-21): User’s Guide for Polycom HDX Series
SIP/H.323 Calls: LifeSize