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Yealink SIP-T27G Administrator's Guide

Yealink SIP-T27G
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Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
113
Default
Blank
Parameter
static.server_certificates.url <y0000000000xx>.cfg
Description
It configures the access URL of the certificate the phone sends for authentication.
Note: The certificate you want to upload must be in *.pem or *.cer format.
Permitted
Values
URL within 511 characters
Default
Blank
Web UI
T57W/T54W/T53W/T53/T48U/T46U/T43U/T42U:
Security > Server Certificates > Upload Server Certificate File
Other Phones:
Security > Server Certificates > Load Server Certificates File
Parameter
static.server_certificates.delete <y0000000000xx>.cfg
Description
It deletes all uploaded server certificates.
Permitted
Values
http://localhost/all
Default
Blank
Parameter
static.phone_setting.reserve_certs_enable <y0000000000xx>.cfg
Description
It enables or disables the phone to reserve custom certificates after it is reset to factory defaults.
Permitted
Values
0-Disabled
1-Enabled
Default
0
Parameter
static.phone_setting.reserve_certs_config.enable
[3]
<y0000000000xx>.cfg
Description
It enables or disables the phone to reserve the trusted and server certificates settings after the phone
reset to factory defaults.
Permitted
Values
0-Disabled, “static.security.trust_certificates”, “static.security.ca_cert”, “static.security.cn_validation”
and “static.security.dev_cert” will be reset.
1-Enabled, “static.security.trust_certificates”, “static.security.ca_cert”, “static.security.cn_validation”,
“static.security.dev_cert and “static.phone_setting.reserve_certs_config.enable will not be reset.
Default
0
[1]
X is the account ID. For T57W/T54W/T48U/T48S/T48G/T46U/T46S/T46G/T29G, X=1-16; for
T53W/T53/T43U/T42G/T42U/T42S, X=1-12; for T41P/T41S/T27G, X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21
(P) E2, X=1-2; for T19(P) E2/CP920, X=1.
[2]
Y is the server ID. Y=1-2.
[3]
If you change this parameter, the phone will reboot to make the change take effect.
Secure Real-Time Transport Protocol (SRTP)
Secure Real-Time Transport Protocol (SRTP) encrypts the audio streams during VoIP phone calls to avoid inter-
ception and eavesdropping. The parties participating in the call must enable SRTP feature simultaneously. When
this feature is enabled on both phones, the type of encryption to use for the session is negotiated between the
phones. This negotiation process is compliant with RFC 4568.

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Yealink SIP-T27G Specifications

General IconGeneral
MountingDesk/Wall
Handset typeWired handset
Product typeIP Phone
Product colorBlack, Gold
Wall mountableYes
Display diagonal3.66 \
Display resolution240 x 120 pixels
RJ-9 ports quantity2
USB 2.0 ports quantity1
Voice codecsCNG, G.711, G.722, G.723.1, G.726, G.729, G.729ab, VAD, iLBC
Dual-Tone Multi-Frequency (DTMF) modesSIP info
Lines quantity8 lines
Phonebook capacity1000 entries
Number of VoIP accounts6
Bluetooth-
Security algorithmsAES, MD5
Networking standardsIEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN interface typeGigabit Ethernet
Volume controlDigital
Operating temperature (T-T)-10 - 50 °C
Operating relative humidity (H-H)10 - 95 %
Cables includedLAN (RJ-45)
Number of handles included1 pc(s)
Harmonized System (HS) code85171800
Weight and Dimensions IconWeight and Dimensions
Depth210 mm
Width265 mm
Height170.5 mm

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