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Configuring VoIP on a Switch
Understanding How QoS Works in the Cisco IP Phone 7960
The Cisco IP Phone 7960 always sets Layer 3 IP precedence and Layer 2 CoS to 5 in voice traffic
Note
generated by the phone. The Layer 3 IP precedence and Layer 2 CoS values in voice traffic generated
by the phone are not configurable.
You can configure the Cisco IP Phone 7960 access port (see
mode.
Untrusted mode means that all traffic in 802.1Q or 802.1p frames received through the access port is
marked with a configured Layer 2 CoS value. The default Layer 2 CoS value is 0. Untrusted mode is the
default when the phone is connected to a Cisco LAN switch.
Trusted mode means that all traffic received through the access port passes through the phone switch
unchanged. Trusted mode is the default when the phone is not connected to a Cisco LAN switch.
Traffic in frame types other than 802.1Q or 802.1p passes through the phone switch unchanged,
regardless of the access port trust state.
Figure 44-5 Configuring QoS on the IP Phone Ports
Configuring QoS in the Cisco IP Phone 7960
These sections describe how to configure QoS in the Cisco IP Phone 7960:
•
•
•
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
44-30
Setting the Phone Access Port Trust Mode, page 44-31
Setting the Phone Access Port CoS Value, page 44-31
Verifying the Phone Access Port QoS Configuration, page 44-31
Chapter 44
Configuring a VoIP Network
Figure
44-5) to either trusted or untrusted
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Troubleshooting
