Polycom RMX 1500 Administrator's Manual page 109

Chapter 2-Additional Conferencing Information
The participant encryption status is also indicated in the Participant Properties – SDP tab,
where SRTP indication is listed for each encrypted channel (for example, audio and video).
An encrypted participant who is unable to join a conference is disconnected from the
conference. The disconnection cause is displayed in the Participant Properties – Connection
Status tab, Security Failure indication, and the Cause box identifies the encryption related
situation.
For more information about monitoring, see "Conference and Participant Monitoring" on
page 11-1.
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