Yealink T27P Administrator's Guide

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
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 AES256-SHA
 EDH-RSA-DES-CBC3-SHA
 EDH-DSS-DES-CBC3-SHA
 DES-CBC3-SHA
 DHE-RSA-AES128-SHA
 DHE-DSS-AES128-SHA
 AES128-SHA
 IDEA-CBC-SHA
 DHE-DSS-RC4-SHA
 RC4-SHA
 RC4-MD5
 EXP1024-DHE-DSS-DES-CBC-SHA
 EXP1024-DES-CBC-SHA
 EDH-RSA-DES-CBC-SHA
 EDH-DSS-DES-CBC-SHA
 DES-CBC-SHA
 EXP1024-DHE-DSS-RC4-SHA
 EXP1024-RC4-SHA
 EXP1024-RC4-MD5
 EXP-EDH-RSA-DES-CBC-SHA
 EXP-EDH-DSS-DES-CBC-SHA
 EXP-DES-CBC-SHA
 EXP-RC4-MD5
The following figure illustrates the TLS messages exchanged between the IP phone and
TLS server to establish an encrypted communication channel:
Step1: IP phone sends “Client Hello” message proposing SSL options.
Step2: Server responds with “Server Hello” message selecting the SSL options, sends its
public key information in “Server Key Exchange” message and concludes its part of the
negotiation with “Server Hello Done” message.
Step3: IP phone sends session key information (encrypted by server’s public key) in 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)