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

User's Manual

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:
Application
Debugging interface
Telnet
Web server (HTTP)
SNMP GET/SET
Web server (HTTPS)
RTP traffic
RTCP traffic
T.38 traffic
SIP
SIP over TLS (SIPS)
Syslog
SNMP Traps
DNS client
NTP

To configure DiffServ (Layer-3 QoS) values per CoS:
1. Open the QoS Settings page (Setup menu > IP Network tab > Quality folder > QoS
Settings).
Version 7.2
Table 11-16: Traffic/Network Types and Priority
Traffic / Network Types
Management
Management
Management
Management
Management
Media
Media
Media
Control
Control
Management
Management
Varies according to DNS settings:

OAMP

Control
Varies according to the interface
type associated with NTP (see
''Assigning NTP Services to
Application Types'' on page 134):

OAMP

Control
Class-of-Service (Priority)
Bronze
Bronze
Bronze
Bronze
Bronze
Media Premium
Media Premium
Media Premium
Control Premium
Control Premium
Bronze
Bronze
Depends on traffic type:

Control: Control Premium

Management: Bronze
Depends on traffic type:

Control: Control Premium

Management: Bronze
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11. Network
Mediant 4000 SBC