Version 5.8 89 October 2009
SIP User's Manual 3. Web-Based Management
îš„ Source/destination ports
îš„ Limit the rule for specific days and hours
The device supports two priority marking methods for packet prioritization:
îš„ DSCP (refer to ''Configuring DSCP Settings'' on page 95).
îš„ 802.1p Priority (refer to ''Configuring 802.1p Settings'' on page 97).
The matching of packets by rules is connection-based, known as Stateful Packet Inspection
(SPI), using the same connection-tracking mechanism used by the device's 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:
îš„ The first class rule has precedence over all other class rules (scanning is stopped
once the first rule is reached).
îš„ The first traffic-priority (classless) rule has precedence over all other traffic-priority
rules.
îš„ 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) takes 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 also apply to both control and data ports (even if the data ports are unknown). This
feature applies to all applications that have ALG in the firewall such as SIP, MSN
Messenger/Windows Messenger, TFTP, Port Triggering applications (refer to ''Configuring
Port Triggering'' on page 80), PPTP, and IPSec.
¾ To set traffic priority rules:
1. Click the Traffic Priority item (Configuration tab > Data Settings menu > QoS
submenu > Traffic Priority page item); the following page appears:
Figure 3-68: Configuring Traffic Priority
This page is organized into two groups - 'QoS Input Rules' and 'QoS Output Rules' -
for prioritizing inbound and outbound traffic, respectively. Each group lists all the
gateway devices on which rules can be set. You can set rules on all devices using the
'All Devices' row.
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