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configuration
for voice data, ensuring the transmission priority of voice data stream and voice
quality.
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 a packet complies with the OUI addresses configured by
the system, the packet is determined as voice packet 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
Voice VLAN Port 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.
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.
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