Ruijie RG-S2900G-E Series, Configuration Manual

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Configuration Guide Voice VLAN Configuration
2. PC and IP phones form a daisy chain to access the network with voice and
data streams transmitted. In this case, voice streams and data streams are
transmitted in voice VLAN and data VLAN respectively. Generally, this type of
connection is applied when office clerks need to conduct both data
communication with PC and voice communication with IP phones.
Definition of each role in the basic network topology:
Table 1 Definition of roles in Voice VLAN network
Role Definition
VoIP Server The server group (which may be a server undertaking a number of
application services or a group of servers that provide different
services) may be Call Agent, DHCP server (which assigns
automatically IP addresses, Voice VLAN ID, etc. to IP phones) , etc.
Interconnected
equipments
The equipments that offer Voice VLAN function
User terminal
equipment
IP phones and users
’ PCs
Voice VLAN-enabled device determines whether the packet is the voice stream
to the specific voice device by matching the source MAC address of incoming
packet with the OUI (Organizationally Unique Identifier) of the voice device. If so,
the packet is partitioned into the voice VLAN for transmission.
Note
QUI is the first 24 bits of the MAC address that the IEEE assigns for a vendor.
OUI is so unique that users can determine the manufacturer of an equipment.
Basic Concepts
Auto mode and manual mode of Voice VLAN
A port can work in the auto mode or manual mode of voice VLAN with different
join methods.

Auto mode
When a subscriber runs an IP phone and sends protocol packet through a voice
VLAN-enabled equipment, the equipment identifies the source MAC address of
protocol packet and matches the MAC address with the OUI address set on the
switch. If succeed, the equipment will automatically add the input port of the
voice message to Voice VLAN and issue the policy to modify the priority of voice