141Voice VLAN configurationOverviewA voice VLAN is configured for voice traffic. After assigning the ports that connect to voice devices to avoice VLAN, the system automatically configures quality of service (QoS) parameters for voice traffic, toimprove the transmission priority of voice traffic and ensure voice quality.NOTE:Common voice devices include IP phones and integrated access devices (IADs). Only IP phones are usedin the voice VLAN configuration examples in this document.OUI addressesA device determines whether a received packet is a voice packet by evaluating its source MAC address.A packet whose source MAC address complies with the Organizationally Unique Identifier (OUI)address of the voice device is regarded as voice traffic.You can configure the OUI addresses of a device in advance or use the default OUI addresses. Table 14lists the default OUI address for each vendor’s devices.Table 14 The default OUI addresses of different vendorsNumber OUI address Vendor1 0001-E300-0000 Siemens phone2 0003-6B00-0000 Cisco phone3 0004-0D00-0000 Avaya phone4 00D0-1E00-0000 Pingtel phone5 0060-B900-0000 Philips/NEC phone6 00E0-7500-0000 Polycom phone7 00E0-BB00-0000 3Com phoneNOTE:• In general, as the first 24 bits of a MAC address (in binary format), an OUI address is a globally uniqueidentifier that IEEE assigns to a vendor. In this document, however, OUI addresses are addresses that thesystem uses to determine whether a received packet is a voice packet. They are the results of the ANDoperation of the argumentsmac-address andoui-mask in the voice vlan mac-address command.• You can remove the default OUI address of a device manually and then add new ones manually.Voice VLAN assignment modesA port can be assigned to a voice VLAN in one of the following modes:
