Configuring Quality Of Service; Configuring Class-Of-Service Qos - AudioCodes Mediant 4000 SBC User Manual

The device's support for ICE-Lite means that it does not initiate the ICE process. Instead, it
supports remote endpoints that initiate ICE to discover their workable public IP address
with the device. Therefore, the device supports the receipt of STUN binding requests for
connectivity checks of ICE candidates and responds to them with STUN responses. Note
that in the response to the INVITE message received from the remote endpoint, the device
sends only a single candidate for its' own IP address. This is the IP address of the device
that the client uses. To support ICE, the SBC leg interfacing with the ICE-enabled client
(SIP entity) must be enabled for ICE. This is done using the IP Profile parameter,
IPProfile_SBCIceMode (see ''Configuring IP Profiles'' on page 424).
As the ICE technique has been defined by the WebRTC standard as mandatory for
communication with the WebRTC client, ICE support by the device is important for
deployments implementing WebRTC. For more information on WebRTC, see ''WebRTC''
on page 572. Once a WebRTC session (WebSocket) is established for SIP signaling
between the device and the WebRTC client, the client's IP address needs to be discovered
by the SBC device using the ICE technique.
11.8

Configuring Quality of Service

This section describes how to configure Layer-2 and Layer-3 Quality of Service (QoS).

11.8.1 Configuring Class-of-Service QoS

The QoS Settings page lets you configure Layer-3 Class-of-Service Quality of Service
(QoS). This configures Differentiated Services (DiffServ) values for each CoS. DiffServ is
an architecture providing different types or levels of service for IP traffic. DiffServ
(according to RFC 2474), prioritizes certain traffic types based on priority, accomplishing a
higher-level QoS at the expense of other traffic types. By prioritizing packets, DiffServ
routers can minimize transmission delays for time-sensitive packets such as VoIP packets.
You can assign DiffServ to the following class of services (CoS):

Media Premium: RTP packets sent to the LAN

Control Premium: Control protocol (SIP) packets sent to the LAN

Gold: HTTP streaming packets sent to the LAN

Bronze: OAMP packets sent to the LAN
The mapping of an application to its CoS and traffic type is shown in the table below:
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Mediant 4000 SBC
Document #: LTRT-42025