TP-Link TL-SL5428E manual ¾ Security Mode of Voice Vlan, Packet Type Processing Mode

Port Voice	Voice	Link type of the port and processing mode
VLAN Mode	Stream Type
		ACCESS: Not supported.
	TAG voice	TRUNK: Supported. The default VLAN of the port can not be
		voice VLAN.
	stream
		GENERAL: Supported. The default VLAN of the port can not
		be voice VLAN and the egress rule of the access port in the
Automatic Mode		voice VLAN should be TAG.
		ACCESS: Supported.
	UNTAG voice	TRUNK: Not supported.
	stream	GENERAL: Supported. The default VLAN of the port can not
		be voice VLAN and the egress rule of the access port in the
		voice VLAN should be UNTAG.
		ACCESS: Not supported.
	TAG voice	TRUNK：Supported. The default VLAN of the port should not
		be voice VLAN.
	stream
		GENERAL：Supported. The default VLAN of the port can not
		be voice VLAN and the egress rule of the access port in the
Manual Mode		voice VLAN should be TAG.
		ACCESS: Supported.
	UNTAG voice	TRUNK: Not supported.
	stream	GENERAL: Supported. The default VLAN of the port should
		be voice VLAN and the egress rule of the access port in the
		voice VLAN should be UNTAG.

Table 9-2 Port voice VLAN mode and voice stream processing mode

¾Security Mode of Voice VLAN

When voice VLAN is enabled for a port, you can configure its security mode to filter data stream. If security mode is enabled, the port just forwards voice packets, and discards other packets whose source MAC addresses do not match OUI addresses. If security mode is not enabled, the port forwards all the packets.

Security Mode	Packet Type		Processing Mode
	UNTAG packet		When the source MAC address of the packet is the OUI
			address that can be identified, the packet can be
	Packet with voice
			transmitted in the voice VLAN. Otherwise, the packet will
Enable	VLAN TAG		be discarded.
	Packet with other	The processing mode for the device to deal with the packet
		is determined by whether the port permits		the VLAN or
	VLAN TAG	not, independent of voice VLAN security mode.
	UNTAG packet		Do not check the source MAC address of the packet and all
	Packet with voice
			the packets can be transmitted in the voice VLAN.
Disable	VLAN TAG
	Packet with other	The processing mode for the device to deal with the packet
		is determined by whether the port permits		the VLAN or
	VLAN TAG	not, independent of voice VLAN security mode.
	Table 9-3 Security mode and packets processing mode
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