Polycom RealPresence 1500 Administrator's Manual page 1058

● Either the PRESERVE_PARTY_CELL_ON_FORCE_LAYOUT System Flag = NO
or
The endpoint is not forced in the layout.
In Lync environments that do not include ICE, the empty cell will remain in the layout for direct Lync
calls.
Case 2
The RTV_MAX_BIT_RATE_FOR_FORCE_CIF_PARTICIPANT System Flag has been added to the system
with a default value of 192 (kbps). This ensures that the Lync Client sends the correct resolution and that
its cell in the Video Layout is displayed correctly.
Polycom®, Inc.
Appendix H - Deployment Into Microsoft Environments
1028