3Com 2928 User Guide - Page 183
Table 1-2, Port link type, Voice, assignmen, t mode, traffic type, Access, Trunk, Hybrid, Supported
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When untagged packets are received from an IP phone: z In automatic mode, the system matches the source MAC addresses in the untagged packets sent by the IP phone upon its power-on against the OUI list. If a match is found, the system automatically assigns the receiving port to a voice VLAN, issues ACL rules and configures the packet precedence. You can configure an aging timer for the voice VLAN. The system will remove the port from the voice VLAN when the aging timer expires if no voice packet is received on the port during the aging timer. Assigning ports to and removing ports from a voice VLAN are automatically performed. z In manual mode, you need to assign the port to a voice VLAN manually. Then, the system matches the source MAC addresses in the packets against the OUI addresses. If a match is found, the system issues ACL rules and configures the packet precedence. In this mode, assigning ports to and removing ports from a voice VLAN are performed manually. In both modes, tagged packets are forwarded according to their tags. The following table lists the relationships between the voice assignment VLAN mode, the voice traffic type of an IP phone, and the port link type. Table 1-2 Co-relation Voice VLAN assignmen t mode Voice traffic type Automatic mode Tagged voice traffic Untagged voice traffic Tagged voice traffic Manual mode Untagged voice traffic Access Not supported Not supported Not supported Supported, but you must configure the default VLAN of the port as the voice VLAN. Port link type Trunk Hybrid Supported, but you must ensure that the default VLAN of the port has been created and is not the voice VLAN and the traffic of the default VLAN can pass through the port. Supported, but you must ensure that the default VLAN of the port has been created and is not the voice VLAN and the traffic of the default VLAN can pass through the port tagged. Not supported Not supported Supported, but you must ensure that the default VLAN of the port has been created and is not the voice VLAN and the traffic of the default VLAN can pass through the port. Supported, but you must ensure that the default VLAN of the port has been created and is not the voice VLAN and the traffic of the voice VLAN can pass through the port tagged. Supported, but you must configure the default VLAN of the port as the voice VLAN and configure the port to allow the traffic of the voice VLAN to pass through. Supported, but you must configure the default VLAN of the port as the voice VLAN and configure the port to allow the traffic of the voice VLAN to pass through untagged. 1-2