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2.3 DHCP Options for IPv6
The IP phone can obtain IPv6-related parameters in an IPv6 network via DHCP option.
Parameters
Provision URL
Provision URL
DNS server
Hostname
Domain name
SNTP server
2.3.1 DHCP Option 17 and Option 59
During the startup, the phone will automatically detect 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.
2.4 VLAN
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, and then
manual configuration.
2.4.1 LLDP Configuration
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.
Parameter
DeviceNetworkLldpVlanEnable
ALE M3-M5-M7-M8 DeskPhones Administrator Guide
DHCP Option
Option 59
Option 17
Option 23
Option 39
Option 24
Option 31
Description
One provisioning URL address or FQDN
Full path provisioning URL
config.xml
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