AudioCodes Mediant 3000 User Manual

Version 7.0 157 Mediant 3000
User's Manual 13. Network
13.5 Configuring Quality of Service
The QoS Settings page lets you configure Layer-2 and Layer-3 Quality of Service (QoS).
Differentiated Services (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 different VLAN priorities (IEEE 802.1p) and DiffServ to the following class
of services (CoS):

Network – network control traffic (ICMP, ARP)

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 Layer-3 QoS parameters define the values of the DiffServ field in the IP header of the
frames related to a specific service class. The Layer-2 QoS parameters define the values
for the 3 priority bits in the VLAN tag to a specific service class (according to the IEEE
802.1p standard).
The mapping of an application to its CoS and traffic type is shown in the table below:
Table 13-11: Traffic/Network Types and Priority
Application Traffic / Network Types Class-of-Service (Priority)
Debugging interface
Management Bronze
Telnet
Management Bronze
DHCP
Management Network
Web server (HTTP)
Management Bronze
SNMP GET/SET
Management Bronze
Web server (HTTPS)
Management Bronze
IPSec IKE Determined by the service Determined by the service
RTP traffic
Media Premium media
RTCP traffic
Media Premium media
T.38 traffic
Media Premium media
SIP
Control Premium control
SIP over TLS (SIPS)
Control Premium control
Syslog
Management Bronze
ICMP Management Determined by the initiator of the
request
ARP listener Determined by the initiator of the
request
Network
SNMP Traps
Management Bronze
DNS client
Varies according to DNS settings: Depends on traffic type:

AudioCodes Mediant 3000 Specifications

General

Brand	AudioCodes
Model	Mediant 3000
Category	Gateway
Language	English