Enabling Precedence - Polycom realpresence 1800 Administrator's Manual

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
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
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:
● The RMX uses the information in the SIP Message header to match the call to a Precedence Domain
and a Precedence Level. The table below summarizes the default values.
Precedence Domain and Resource Priority - DSCP Default Values
Resource
Priority
9
8
Polycom, Inc.
Precedence Level
FLASH-OVERRIDE-OVERRIDE
FLASH-OVERRIDE
Values.
Modifying the Default IP Network
Audio
33 (0x21)
33 (0x21)
Ultra Secure Mode
Service.
DSCP Value
Video
33 (0x21)
33 (0x21)
861