Yealink SIP-T57W Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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Supported DSS Keys
The following table lists the number of DSS keys you can configure for each phone model:
Phone Model Line Keys Programmable Keys Ext Keys
T57W 29 9 60
T54W 27 15 60
T53W/T53/T43U 21 13 60
T48U 29 15 60
T48G/T48S 29 15 40
T46U 27 15 60
T46S/T46G 27 15 40
T42U/T42G/T42S 15 13 /
T41P/T41S 15 13 /
T40P/T40G 3 13 /
T29G 27 16 39
T27G 21 16 39
T23P/T23G 3 13 /
T19(P) E2 / 13 /
CP920 / 8 /
Note: The programmable key takes effect only if the phone is idle.
The ext key takes effect only if the expansion module is connected to the phone.
Supported Dsskey Types
The supported Dsskey function types vary by line keys, programmable keys, and Ext keys.
ID DSS Key Types ID DSS Key Types ID DSS Key Types
0 N/A 20 Private Hold 51
Switch Account Up
(Programmable key)
1
Conference
(Line key/Ext key)
22 XML Group 52
Switch Account Down
(Programmable key)
2 Forward 23 Group Pickup 56
Retrieve Park
(Line key/Ext key)
3
Transfer
(Line key/Ext key)
24
Paging(Multicast
Paging)
(Line key/Ext key)
61 Directory
4
Hold
(Line key/Ext key)
25
Record
(Line key/Ext key)
66 Paging List
5 DND 27 XML Browser 73
Custom Key (only appear when “fea-
tures.enhanced_dss_keys.enable = 1”)
7 Recall 28
History
(Programmable key)
77
Mobile Account (only appear when the
Bluetooth-enabled mobile phone is con-
nected)

Yealink SIP-T57W Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Ethernet LAN	Yes
Wi-Fi standards	802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac)
Security algorithms	AES, HTTPS, MD5, SRTP
Networking standards	IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	FTP/TFTP/HTTP/HTTPS
Dual-Tone Multi-Frequency (DTMF) modes	In-band, Out-of band, SIP info
USB 2.0 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
AC adapter input voltage	100 - 240 V
AC adapter output current	2 A
AC adapter output voltage	5 V
Volume control	Buttons
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Display diagonal	7 \
Display resolution	800 x 480 pixels
Front camera	No
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Voice codecs	G.722, G.723.1, G.726, G.729A, G.729B, iLBC

Weight and Dimensions

Depth	220 mm
Width	259.4 mm
Height	211 mm