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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 1069
● When Call Admission Control is enabled in the local network, by default the local the ICE channel is
closed after applying CAC bandwidth management.
To change and preserve the ICE channel open throughout the call:
PRESERVE_ICE_CHANNEL_IN_CASE_OF_LOCAL_MODE=YES.
Conferencing Behavior
Continuous Presence Conferences
In Continuous Presence conference, Lync clients connect with any allocated bandwidth.
Video Switching Conferences
In Video Switching conferences, Lync clients must connect with the same line rate as the conference,
otherwise they will be connected as Secondary (Audio Only) participants.
Mitigation of the line rate requirement can be effected by modifying the system flag:
VSW_RATE_TOLERANCE_PERECENT.
This system flag determines the line rate tolerance.
Possible values are: 0 - 75.
Setting this flag to 0 (0% - default) determines no line rate tolerance and the participant must connect at the
conference line rate.
Setting this flag to a value between 1 and 75 determines the percentage of bandwidth that can be deducted
from the required bandwidth to allow participants to connect to the conference.
For example, if you enter 20 (for 20%) as the flag value, the participant will be able to connect to the
conference if the allocated line rate is up to 20% lower than the conference line rate (or between 80% to
100% of the required bandwidth). If the conference line rate is 1024Kbps, participant with a line rate between
819Kbps and 1024Kbps will be able to connect to the conference.
When a tolerance is set, the Highest Common mechanism is enabled for the conference line rate. When a
participant with a lower line rate connects to the conference, the line rate of all other connected participants
is reduced accordingly and when that participant disconnects from the conference, the line rate of the
remaining participants is increased to the highest possible rate common to all connected participants.
For example, if a participant with a line rate of 900Kbps connects to the conference to which all other
participants are connected at a line rate of 1024kbps, the line rate of all participants will decrease to
900Kbps. When this participant disconnects, the line rate of the remaining participants will increase to
1024Kbps.