During the startup, the phone will automatically detect the option 17 or option 59 for obtaining the
provisioning server address. The priority of obtaining the provisioning server address is as follows:
option 17-> option 59.
The purpose of VLAN configurations on the IP phone is to insert a tag with VLAN information to the
packets generated by the IP phone. When VLAN is properly configured for the ports (Internet port
and PC port) on the IP phone, the IP phone will tag all packets from these ports with the VLAN ID.
The switch receives and forwards the tagged packets to the corresponding VLAN according to the
VLAN ID in the tag as described in IEEE Std 802.3.
VLAN on IP phones allows simultaneous access to a regular PC. This feature allows a PC to be
daisy chained to an IP phone and the connection for both PC and IP phone to be trunked through
the same physical Ethernet cable.
In addition to manual configuration, the IP phone also supports automatic discovery of VLAN via
LLDP or DHCP. The assignment takes effect in this order: assignment via LLDP, assignment via
DHCP, then manual configuration.
Topics
LLDP Configuration
Manual VLAN Configuration
DHCP VLAN
LLDP (Linker Layer Discovery Protocol) is a vendor-neutral Link Layer protocol, which allows IP
phones to receive and/or transmit device-related information from/to directly connected devices on
the network that are also using the protocol, and store the information about other devices.
When LLDP feature is enabled on IP phones, the IP phones periodically advertise their own
information to the directly connected LLDP-enabled switch. The IP phones can also receive LLDP
packets from the connected switch. When the application type is “voice”, the IP phones decide
whether to update the VLAN configurations obtained from the LLDP packets. When the VLAN
configurations on the IP phones are different from the ones sent by the switch, the IP phones
perform an update and reboot. This allows the IP phones to plug into any switch, obtain their VLAN
IDs, and then start communications with the call control.
The following table lists the parameters you can use to configure LLDP.
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