RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

Polycom RMX 1500/2000/4000 Administrator’s Guide
This behavior can be changed so the ICE channel is preserved open throughout the call by
manually adding the flag to System Configuration
PRESERVE_ICE_CHANNEL_IN_CASE_OF_LOCAL_MODE and changing the its value
to 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.
H-58 Polycom, Inc.