RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
23-38
Polycom, Inc.
Preemption
is the method whereby, when system resources are insufficient, lower priority
calls are terminated and their resources assigned to higher priority calls.
Preemption
is
typically a function of network components such as the
Local Session Controller (LSC
). To the
RMX
, a preempted call appears as a disconnected call.
Enabling Precedence
Precedence
is disabled by default. It is enabled by using the
Setup > Precedence
Settings
menu to display the
Precedence Settings
dialog box.
Precedence
is enabled by selecting the
Use
Precedence
check box.
See "
Configuring and Modifying Precedence Domains and DSCP Values”
on page
23-42
.
When
Precedence
is enabled, all other
QoS
system settings are overridden by the parameters
sent in the
SIP Message
. For more information about
QoS
, see the
RealPresence® Collaboration
Server (RMX) 1500/2000/4000 Administrator’s Guide
, "
Network Services”
on page
1-1
.
SIP Message
A
SIP Message
is a request or a response between network entities that communicate using
the SIP protocol. The
SIP
Message
header contains
Precedence
and
Resource Priority
(
r-value
)
information
and an optional
Require
tag for each call.
For a full description of
SIP Messages
see
IETF RFC 3261
.
For a full description of
Resource Priority (DSCP)
see
IETF RFC 2474
.
For a full description of SIP
r-priority
see
IETF RFC 4412
.
Dial-in calls
If the
Use Precedence
check box in
Precedence Settings
is selected:
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