Version 2.6 67 May 1
MP-202 Telephone Adapter 8. Quality of Service (QoS)
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)
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