Actiontec electronic RI408 - Manual (Page 125)

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Actiontec Broadband Router User Manual
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Appendix A Quality of Service
The matching of packets by rules is connection-based, known as Stateful Packet
Inspection (
SPI ), using the Router’s firewall mechanism. Once a packet matches a
rule, all subsequent packets with the same attributes receive the same Q o S param-
eters, both inbound and outbound. Connection-based Q o S also allows inheriting
Q o S parameters by some of the applications that open subsequent connections.
For instance, Q o S rules can be defined on SIP , and the rules will apply to both con-
trol and data ports (even if the data ports are unknown). Applications that support
such inheritance have an
ALG in the firewall. They are:
• SIP
• MSN Messenger/Windows Messenger
• TFTP
• FTP
• MGCP
• H .323
• Port triggering applications
• PPTP
• IPS ec