1-4z Set the DSCP value to 46.Configuring Voice VLAN Assignment Mode of a PortA port can work in automatic voice VLAN assignment mode or manual voice VLAN assignment mode.You can configure the voice VLAN assignment mode for a port according to data traffic passing throughthe port.Processing mode of untagged packets sent by IP voice devicesz Automatic voice VLAN assignment mode. An Switch 4500 Ethernet switch automatically adds aport connecting an IP voice device to the voice VLAN by learning the source MAC address in theuntagged packet sent by the IP voice device when it is powered on. The voice VLAN uses the agingmechanism to maintain the number of ports in the voice VLAN. When the aging timer expires, theports whose OUI addresses are not updated (that is, no voice traffic passes) will be removed fromthe voice VLAN. In voice VLAN assignment automatic mode, ports can not be added to or removedfrom a voice VLAN manually.z Manual voice VLAN assignment mode: In this mode, you need to add a port to a voice VLAN orremove a port from a voice VLAN manually.Processing mode of tagged packets sent by IP voice devicesTagged packets from IP voice devices are forwarded based on their tagged VLAN IDs, whether theautomatic or manual voice VLAN assignment mode is used.If the voice traffic transmitted by an IP voice device carries VLAN tags, and 802.1x authentication andguest VLAN is enabled on the port which the IP voice device is connected to, assign different VLAN IDsfor the voice VLAN, the default VLAN of the port, and the 802.1x guest VLAN to ensure the effectiveoperation of these functions.Support for Voice VLAN on Various PortsVoice VLAN packets can be forwarded by access ports, trunk ports, and hybrid ports. You can enable atrunk or hybrid port belonging to other VLANs to forward voice and service packets simultaneously byenabling the voice VLAN.For different types of IP phones, the support for voice VLAN varies with port types and port configuration.For IP phones capable of acquiring IP address and voice VLAN automatically, the support for voiceVLAN is described in Table 1-2.
