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System Configuration
Polycom, Inc. 39
3 Click OK. The server restarts to apply your changes.
Configure SNMP
Your system provides a standard SNMP (Simple Network Management Protocol) interface which supports
SNMP version 1, version 2, and version 3 queries with confidentiality, authentication, and integrity functions
Parameter Description
Enable QoS for Signaling and
Media
Enable configuration of the QoS settings. if not selected, the system uses
the default QoS settings.
Type DiffServ and Precedence are two methods for encoding packet priority. The
priority set here for audio and video packets should match the priority set in
the network routers.
• Differv: Select when the network router uses Differv for priority
encoding. If this option is selected, enter values in the Audio and Video
fields. The value range is 0-63.
Note: If you select DiffServ but your router does not support this
standard, IP packets queue on the same communication links with data
packets. This non-prioritized queueing greatly increases the latency and
jitters in their delivery and can negatively impact performance.
• Precedence: Select this option when the network router uses
Precedence for priority encoding, or when you are not sure which
method is used by the router. Precedence should be matched with None
in the ToS field. The value range is 0-5. If this option is selected, enter
values in the Audio and Video fields. The value range is 0-5.
Note: Precedence is the default mode as it is capable of providing
priority services to all types of routers and is currently the most common
mechanism.
Audio / Video Specify the priority for audio and video IP packets.
The recommended priority is 4 for audio and video to ensure that the packet
delay for both is the same, that audio and video packets are synchronized,
and to ensure lip and audio synchronization (lip sync).
Control Specify the priority for controlling packets.
ToS Select the ToS (Type of Service) that defines optimization tagging for routing
the conference audio and video packets.
• Delay: The recommended default for video conferencing: prioritized
audio and video packets tagged with this definition are delivered with
minimal delay.
•None: No optimization definition is applied. This is a compatibility mode
in which routing is based on Precedence priority settings only. Select
None if you do not know which standard your router supports.
QoS settings applies to SIP and H.323 calls only, it does not apply to
streaming.