Yealink T27P Administrator's Guide

Getting Started
31
The following table lists common DHCP options supported by IP phones.
Parameter
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.
Log Server
7
Specify a list of MIT-LCS UDP 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.
Broadcast
Address
28
Specify the broadcast address in use on the
client's subnet.
Network Time
Protocol
Servers
42
Specify a list of NTP servers available to the
client by IP address.
Vendor-Specific
Information
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.
Boot file Name
67
Identify a boot file when the 'file' field in the
DHCP header has been used for DHCP
options.
For more information on DHCP options, refer to
http://www.ietf.org/rfc/rfc2131.txt?number=2131 or
http://www.ietf.org/rfc/rfc2132.txt?number=2132.
If you do not have the ability to configure the DHCP options for discovering the

Yealink T27P Specifications

General

Wall Mountable	Yes
Local Phonebook	1000 entries
Bluetooth	No
Wi-Fi	No
Gigabit Ethernet	No
Display	3.66" 240x120 pixel graphical LCD with backlight
Audio Features	HD voice, Full-duplex speakerphone
Network	Dual-port 10/100 Ethernet switch
Protocols	SIP v1 (RFC2543), v2 (RFC3261)
Power	IEEE 802.3af PoE
Connectivity	2 x RJ45 10/100M Ethernet ports
Voice Codecs	G.711(A/μ), G.722, G.723, G.729AB, G.726
EHS	Supports EHS with Plantronics headsets
Headset Port	Yes
Power Adapter	5V DC (optional)