Verizon MI424WR - Manual (Page 149)

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Wireless Broadband Router User Manual
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:
s SIP
s MSN Messenger/Windows Messenger
s TFTP
s FTP
s MGCP
s H .323
s
s PPTP
s IPS ec