Yealink SIP-T33P Administrator's Guide

Network Configurations
31
DHCP Option for IPv4
The phone can obtain IPv4-related parameters in an IPv4 network via the 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 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 Univer-
sal 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 the client should use when resolving host-
names 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 automatically detects the DHCP option for obtaining the provisioning server address.
The priority is as follows: custom option > option 66 (identify the TFTP server) > option 43.
The phone can obtain the Auto Configuration Server (ACS) address by detecting option 43 during startup.
Note: If you fail to configure the DHCP options for discovering the provisioning server on the DHCP server, enable the phone
to automatically discover the provisioning server address. One possibility is that connecting to the secondary DHCP server
that responds to DHCP INFORM queries with a requested provisioning server address. For more information, refer to RFC
3925.
Related Topic

Yealink SIP-T33P Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Wall mountable	Yes
Operating system installed	Linux
Lines quantity	4 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	4
Volume control	Buttons
Number of function keys	5
Display diagonal	2.4 \
Display resolution	320 x 240 pixels
Voice codecs	AGC, AJB, CNG, G.711a, G.711u, G.722, G.723.1, G.726, G.729, G.729A, PLC, VAD, iLBC
Security algorithms	AES, HTTPS
Ethernet LAN data rates	10, 100 Mbit/s
Ethernet LAN interface type	Fast Ethernet
RJ-9 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Input frequency	50/60 Hz
AC adapter input voltage	100 - 240 V
Power consumption (typical)	3 W
Power consumption (Power over Ethernet (PoE))	5 W
Number of handles included	1 pc(s)
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %

Weight and Dimensions

Depth	186 mm
Width	212 mm
Height	146 mm