Cisco Cisco ISA550 Integrated Security Appliance Leaflet
Application Note
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Example: Prioritizing voice traffic
If you know the IP address of the phones, you can use the IP address to filter the voice traffic. Or you can predefine
the voice traffic (SIP and RTP) through L4 port, and then use the destination service (RTP) to select the traffic. First,
create a Traffic Selector that watches for RTP traffic from the SIP-phones range of IP addresses.
Then create a class rule that places this traffic into Q1.