Configuring Class-of-Service QoS

The QoS Settings page lets you configure Layer-3 Class-of-Service Quality of Service (QoS) for VoIP. 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:

Traffic/Network Types and Priority

Application	Traffic / Network Types	Class-of-Service (Priority)
Debugging interface	Management	Bronze
Telnet	Management	Bronze
Web server (HTTP)	Management	Bronze
SNMP GET/SET	Management	Bronze
Web server (HTTPS)	Management	Bronze
RTP traffic	Media	Media Premium
RTCP traffic	Media	Media Premium
T.38 traffic	Media	Media Premium
SIP	Control	Control Premium
SIP over TLS (SIPS)	Control	Control Premium
Syslog	Management	Bronze
SNMP Traps	Management	Bronze
DNS client	Varies according to DNS settings: ■ OAMP ■ Control	Depends on traffic type: ■ Control: Control Premium ■ Management: Bronze
NTP	Varies according to the interface type associated with NTP (see Assigning NTP Services to Application Types): ■ OAMP ■ Control	Depends on traffic type: ■ Control: Control Premium ■ Management: Bronze

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To configure DiffServ (Layer-3 QoS) values per CoS:

1.

Open the QoS Settings page (Setup menu > IP Network tab > Quality folder > QoS Settings).

2.

Click New; the following dialog box appears:

3.

Configure DiffServ values per CoS according to the parameters described in the table below.

4.

Click Apply, and then save your settings to flash memory.

QoS Settings Parameter Descriptions

Parameter	Description
'Media Premium QoS' media-qos [PremiumServiceClassMediaDiffServ]	Defines the DiffServ value for Premium Media CoS content. The valid range is 0 to 63. The default is 46. Note: You can also configure the the parameter per IP Profile (IpProfile_IPDiffServ) or Tel Profile (TelProfile_IPDiffServ).
'Control Premium QoS' control-qos [PremiumServiceClassControlDiffServ]	Defines the DiffServ value for Premium Control CoS content (Call Control applications). The valid range is 0 to 63. The default is 24. Note: You can also configure the the parameter per IP Profile (IpProfile_SigIPDiffServ) or Tel Profile (TelProfile_SigIPDiffServ).
'Gold QoS' gold-qos [GoldServiceClassDiffServ]	Defines the DiffServ value for Gold CoS content (streaming applications). The valid range is 0 to 63. The default is 26.
'Bronze QoS' bronze-qos [BronzeServiceClassDiffServ]	Defines the DiffServ value for Bronze CoS content (OAMP applications). The valid range is 0 to 63. The default is 10.