3-54There are two operational modes for IP Phones:z IP phones are configured with VLAN-mode as enabled, ensuring that tagged packets are used forall communications.z If the IP phone’s VLAN-mode is disabled, the phone uses untagged packets. The phone usesuntagged packets while retrieving the initial IP address through DHCP. The phone eventually usesthe Voice VLAN and starts sending tagged packets.This section contains the following topics:z Modifying OUI Definitionsz Defining Voice VLAN Global Settingsz Defining Voice VLAN Port Settingsz Viewing Voice VLAN Port Settingsz Viewing OUI Summariesz Viewing Voice VLANModifying OUI DefinitionsThe Voice VLAN OUI Modify Page allows network administrators to add new OUIs or to removepreviously defined OUIs from the Voice VLAN. The packet priority derives from the source/destinationMAC prefix. The packet gets higher priority when there is a match with the OUI list. Using the OUI,network managers can add a specific manufacturer’s MAC addresses to the OUI table. Once the OUIsare added, all traffic received on the Voice VLAN ports from the specific IP phone with a listed OUI, isforwarded on the voice VLAN.Click Device > QoS > VoIP Traffic Setting > OUI Modify. The Voice VLAN OUI Modify Page opens.Figure 3-59 Voice VLAN OUI Modify PageThe Voice VLAN OUI Modify Page contains the following fields:Table 3-48 Voice VLAN OUI Modify Page item descriptionItem DescriptionTelephony OUI Defines a new or existing OUI on the Voice VLAN. The field contains the 3most significant bytes of the MAC address.Description Enters a user-defined OUI description. The field may contain up to 32characters.Add Allows the user to add a new OUI.Remove Allows the user to delete an existing OUI.
