Polycom RMX 1500 Administrator's Manual page 460

Chapter 14-Network Services
10 If required, click the QoS tab.
Quality of Service (QoS) is important when transmitting high
bandwidth audio and video information. QoS can be measured and
guaranteed in terms of:
• Average delay between packets
• Variation in delay (jitter)
• Transmission error rate
DiffServ and Precedence are the two QoS methods supported by the
RMX. These methods differ in the way the packet's priority is
encoded in the packet header.
RMX's implementation of QoS is defined per Network Service, not
per endpoint.
The routers must support QoS in order for IP packets to get higher priority.
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