Tp-Link TL-SG3216 [127/236] Voice vlan

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9.3 Voice VLAN

Voice VLANs are configured specially for voice data stream. By configuring Voice VLANs and

adding the ports with voice devices attached to voice VLANs, you can perform QoS-related

configuration for voice data, ensuring the transmission priority of voice data stream and voice

quality.

¾ OUI Address (Organizationally unique identifier address)

The switch can determine whether a received packet is a voice packet by checking its source MAC

address. If the source MAC address of packets comply with the OUI addresses configured by the

system, the packets are determined as voice packets and transmitted in voice VLAN.

An OUI address is a unique identifier assigned by IEEE (Institute of Electrical and Electronics

Engineers) to a device vendor. It comprises the first 24 bits of a MAC address. You can recognize

which vendor a device belongs to according to the OUI address. The following table shows the

OUI addresses of several manufacturers. The following OUI addresses are preset of the switch by

default.

Number OUI Address Vendor

1 00-01-E3-00-00-00 Siemens phone

2 00-03-6B-00-00-00 Cisco phone

3 00-04-0D-00-00-00 Avaya phone

4 00-60-B9-00-00-00 Philips/NEC phone

5 00-D0-1E-00-00-00 Pingtel phone

6 00-E0-75-00-00-00 Polycom phone

7 00-E0-BB-00-00-00 3com phone

Table 9-1 OUI addresses on the switch

¾ Port Voice VLAN Mode

A voice VLAN can operate in two modes: automatic mode and manual mode.

Automatic Mode: In this mode, the switch will automatically add a port which receives voice

packets to voice VLAN and determine the priority of the packets through learning the source MAC

of the UNTAG packets sent from IP phone when it is powered on. The aging time of voice VLAN

can be configured on the switch. If the switch does not receive any voice packet on the ingress

port within the aging time, the switch will remove this port from voice VLAN. Voice ports are

automatically added into or removed from voice VLAN.

Manual Mode: You need to manually add the port of IP phone to voice VLAN, and then the switch

will assign ACL rules and configure the priority of the packets through learning the source MAC

address of packets and matching OUI address.

In practice, the port voice VLAN mode is configured according to the type of packets sent out from

voice device and the link type of the port. The following table shows the detailed information.