Yealink T21PE2 - DHCP Option for Ipv4; Supported DHCP Option for Ipv4; DHCP Option 66, Option 43 and Custom Option

Phone Network
29
[1]
If you change this parameter, the IP phone will reboot to make the change take effect.
DHCP Option for IPv4
The IP phone can obtain IPv4-related parameters in an IPv4 network via DHCP option.
Note
For more information on DHCP options, refer to RFC 2131 or RFC 2132.
Topics
Supported DHCP Option for IPv4
DHCP Option 66, Option 43 and Custom Option
DHCP Option 42, Option 2 and Option 100
DHCP Option 12
DHCP Option 120
DHCP Option 60
Supported DHCP Option for IPv4
The following table lists common DHCP options for IPv4 supported by Yealink IP phones.
Parameters
DHCP
Option
Description
Subnet Mask 1 Specify the client’s subnet mask.
Time Offset 2
Specify the offset of the client's subnet in seconds from Coordinated Universal
Time (UTC).
Router 3 Specify a list of IP addresses for routers on the client’s subnet.
Time Server 4 Specify a list of time servers available to the client.
Domain Name Server 6 Specify a list of domain name servers available to the client.
Host Name 12 Specify the name of the client.
Domain Server 15
Specify the domain name that client should use when resolving hostnames via
DNS.
Network Time Protocol
Servers
42 Specify a list of NTP servers available to the client by IP address.
Vendor-Specific Inform-
ation
43 Identify the vendor-specific information.
Vendor Class Identifier 60 Identify the vendor type.
TFTP Server Name 66
Identify a TFTP server when the 'sname' field in the DHCP header has been
used for DHCP options.
Timezone/DST 100 Specify a POSIX timezone string.
SIP Server/Outbound
Proxy Server
120 Convey a SIP server’s or outbound proxy server’s location to the client.
DHCP Option 66, Option 43 and Custom Option
During the startup, the phone will automatically detect the custom option, option 66, or option 43 for obtaining the
provisioning server address. The priority of obtaining the provisioning server address is as follows: custom