Cisco Ip Phone Voice Traffic; Cisco Ip Phone Data Traffic - Cisco WS-C3560-48PS-S Software Configuration Manual

Software configuration guide

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Understanding Voice VLAN

Figure 14-1 Cisco 7960 IP Phone Connected to a Switch

Cisco IP Phone Voice Traffic

You can configure an access port with an attached Cisco IP Phone to use one VLAN for voice traffic and

another VLAN for data traffic from a device attached to the phone. You can configure access ports on

the switch to send Cisco Discovery Protocol (CDP) packets that instruct an attached Cisco IP Phone to

send voice traffic to the switch in any of these ways:

In all configurations, the voice traffic carries a Layer 3 IP precedence value (the default is 5 for voice

traffic and 3 for voice control traffic).

The switch can also process tagged data traffic (traffic in 802.1Q or 802.1P frame types) from the device

attached to the access port on the Cisco IP Phone (see

ports on the switch to send CDP packets that instruct the attached Cisco IP Phone to configure the IP

phone access port in one of these modes:

Untagged traffic from the device attached to the Cisco IP Phone passes through the IP phone unchanged,

regardless of the trust state of the access port on the IP phone.

Catalyst 3560 Switch Software Configuration Guide

Cisco IP Phone 7960

In the voice VLAN tagged with a Layer 2 CoS priority value

In the access VLAN tagged with a Layer 2 CoS priority value

In the access VLAN, untagged (no Layer 2 CoS priority value)

In trusted mode, all traffic received through the access port on the Cisco IP Phone passes through

the IP phone unchanged.

In untrusted mode, all traffic in 802.1Q or 802.1P frames received through the access port on the IP

phone receive a configured Layer 2 CoS value. The default Layer 2 CoS value is 0. Untrusted mode

is the default.

Configuring Voice VLAN

14-1). You can configure Layer 2 access

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