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In automatic mode, the system matches the source MAC address carried in the untagged packets
sent when an IP phone is powered on against the device’s OUI addresses. If the system finds a
match, it automatically assigns the receiving port to the voice VLAN, issues ACL rules, and
configures the packet precedence. You can configure a voice VLAN aging time on the device. The
system will remove a port from the voice VLAN if no packet is received from the port during the
aging time. The system automatically assigns ports to, or removes ports from, a voice VLAN.
Automatic mode is suitable for scenarios where PCs and IP phones connected in series access the
network through the device and ports on the device transmit both voice traffic and data traffic at the
same time, as shown in Figure 40. When the voice VLAN works normally, when the system reboots,
the system reassigns ports in automatic voice VLAN assignment mode to the voice VLAN after the
reboot, ensuring that existing voice connections can work normally. In this case, voice traffic streams
do not trigger port assignment to the voice VLAN.
Figure 40 PCs and IP phones connected in series access the network
Host
IP Phone Switch
Voice gateway
In manual mode, you must manually assign an IP phone accessing port to a voice VLAN. Then, the
system matches the source MAC addresses carried in the packets against the device’s OUI
addresses. If the system finds a match, it issues ACL rules and configures the packet precedence. In
this mode, you must manually assign ports to, or remove ports from, a voice VLAN. Manual mode is
suitable for scenarios where only IP phones access the network through the device, and ports on the
device transmit only voice traffic, as shown in Figure 41. In this mode, ports assigned to a voice
VLAN transmit voice traffic exclusively, which prevents the impact of data traffic on the transmission
of voice traffic.
Figure 41 Only IP phones access the network
IP Phone
Switch
Voice gateway
IP Phone
Both modes forward tagged packets according to their tags.
Table 15 and Table 16 list the configurations required for ports of different link types 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
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