Polycom 1500/1800/2000/4000 manual Enabling Precedence, SIP Message, Dial-in calls

Ultra Secure Mode

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.

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 Modifying the Default IP Network Service.

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	Precedence Level		DSCP Value
Priority		Audio	Video
9	FLASH-OVERRIDE-OVERRIDE	33 (0x21)	33 (0x21)
8	FLASH-OVERRIDE	33 (0x21)	33 (0x21)

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