Panasonic KX-TDA30 Manual page 10

1.3.2 VLAN (Virtual LAN)
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Some PC LAN cards allow VLAN settings to be assigned. However, when using a PC connected to an
IP-PT with 2 ports, the VLAN settings for PC communications must be assigned only to the secondary
port of the IP-PT. Any VLAN settings assigned to the PC LAN card must be disabled. These settings
can usually be identified by "802.1Q", "802.1p", or "VLAN" in their name.
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If you are using an IP-PT with a primary port only (e.g., KX-NT265), a PC cannot be connected to the
IP-PT.
10 Information about IP Proprietary Telephones