3Com 4500G Family Configuration Manual page 163

Figure 3-2 Only IP phones access the network
Both modes forward tagged packets according to their tags.
The following tables list the required configurations on ports of different link types in order for these
ports to support tagged or untagged voice traffic sent from IP phones when different voice VLAN
assignment modes are configured.
IP phones send tagged voice traffic
Table 3-2 Required configurations on ports of different links types in order for the ports to support
tagged voice traffic
Port link type
Access
Trunk
Hybrid
IP phones send untagged voice traffic
When IP phones send untagged voice traffic, you can only configure the voice traffic receiving ports on
the device to operate in manual voice VLAN assignment mode.
Voice VLAN Support for
assignment tagged voice
mode
Automatic
No
Manual
Automatic
Yes
Manual
Automatic
Yes
Manual
Configuration requirements
traffic
—
Configure the default VLAN of the port,
which cannot be the voice VLAN, and assign
the port to its default VLAN.
Make all the configurations required for the
automatic mode; in addition, assign the port
to the voice VLAN.
Configure the default VLAN of the port,
which cannot be the voice VLAN, and
configure the port to permit packets of its
default VLAN to pass through untagged.
Make all the configurations required for the
automatic mode; in addition, configure the
port to permit packets of the voice VLAN to
pass through tagged.
3-3