Traffic Priority - AudioCodes MP-202 User Manual

8.2

Traffic Priority

Traffic Priority allows you to manage and avoid traffic congestion by defining inbound and
outbound priority rules for each device on your gateway. These rules determine the priority
that packets, traveling through the device, will receive. QoS parameters (DSCP marking
and packet priority) are set per packet, on an application basis.
You can set QoS parameters using flexible rules, according to the following parameters:
Source/destination IP address, MAC address or host name
Device
Source/destination ports
Limit the rule for specific days and hours; the gateway supports two priority marking
methods for packet prioritization:
DSCP
802.1p Priority
The matching of packets by rules is connection-based, known as Stateful Packet
Inspection (SPI), using the same connection-tracking mechanism used by firewall. Once a
packet matches a rule, all subsequent packets with the same attributes receive the same
QoS parameters, both inbound and outbound.
A packet can match more than one rule. Therefore:
The first class rule has precedence over all other class rules (scanning is stopped
once the first rule is reached).
The first traffic-priority (classless) rule has precedence over all other traffic-priority
rules.
There is no prevention of a traffic-priority rule conflicting with a class rule. In this case,
the priority and DSCP setting of the class rule (if given) will take precedence.
Connection-based QoS also allows inheriting QoS parameters by some of the applications
that open subsequent connections. For instance, you can define QoS rules on SIP, and the
rules will apply to both control and data ports (even if the data ports are unknown). This
feature applies to all applications that have ALG at firewall:
Any
User Defined (FTP, HTTP, HTTPS, TFTP, IMAP, PING, POP3, SNMP, SMTP, Telnet,
L2TP, Traceroute or any other protocol)
MP-202 Telephone Adapter 68
MP-202
LTRT-50604