Yealink T40G Administrator's Guide

Phone Network
19
DHCP Option for IPv6
The IP phone can obtain IPv6-related parameters in an IPv6 network via DHCP option.
Topics
Supported DHCP Option for IPv6
DHCP Option 59 and Custom Option
Supported DHCP Option for IPv6
The following table lists common DHCP options for IPv6 supported by Yealink IP phones.
Parameters
DHCP Option
Description
DNS Server
23
Specify a list of DNS servers available to the
client.
DNS Domain Search List
24
Specify a domain search list to a client.
SNTP Server
31
Specify a list of Simple Network Time
Protocol (SNTP) servers available to the
client.
Information Refresh Time
32
Specify an upper bound for how long a
client should wait before refreshing
information retrieved from DHCPv6.
Boot File URL
59
Specify a URL for the boot file to be
downloaded by the client.
DHCP Option 59 and Custom Option
During the startup, the phone will automatically detect the custom option or option 59 for obtaining the
provisioning server address. The priority of obtaining the provisioning server address is as follows:
custom option>option 59.
Related Topic
DHCP Provision Configuration
VLAN
The purpose of VLAN configurations on the IP phone is to insert 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

Yealink T40G Specifications

General

SIP Accounts	3
Wall Mountable	Yes
Opus Codec	No
Display	2.3 inch 132x64-pixel graphical LCD
Network	Dual-port Gigabit Ethernet
PoE	Yes
Headset Support	Yes, RJ9 port
Power Adapter	Optional
Voice Codecs	G.722, G.711(A/μ), G.729AB, G.726
Local Phonebook	1000 entries