Polycom RMX DOC2560B - Manual (Page 124)

Chapter 3-Basic Operation
3-46
Message Overlay
Message Overlay allows messages to be sent to all participants in an
ongoing conference.
A maximum of 24 Unicode characters can be sent as a Message Overlay.
The message can be set to be displayed at various positions on the screen
in different colors, static or scrolling.
For more information see the RMX 1500/2000/4000 Administrator’s Guide
"Message Overlay” on page 2-49 .
Small Text, White on red, Top, Middle Small Text, White on yellow, Bottom