How does a switch advertise the voice VLAN of a port to IP phones

After voice VLAN is configured on a switch interface, configure the switch to advertise the voice VLAN and priority of voice traffic to IP phones in one of the following ways:
Enable the DHCP function for the switch and set Option 184 in the DHCP protocol to perform the advertising.
Enable the LLDP function for the switch to periodically send packets containing the MED parameter to perform the advertising.
Connect the switch to IP phones of some venders and configure the switch to send HDP packets in compatible mode.
NOTE:
You can run the voice-vlan legacy enable command to configure the compatible mode for the voice VLAN.

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