Yealink SIP-T57W Administrator's Guide

Configuration Parameters
527
Parameter
blf.listen_barge_in_code <y0000000000xx>.cfg
Description
It configures the feature access code for barging in the active call of the monitored line in listening
mode.
If configured, you can press the Listen BargeIn soft key to barge in the call. You are automatically
muted so you can listen on the call only. Your outbound audio can not be transmitted to either party.
Note: It applies to the Alcatel-Lucent CTS only.
Permitted
Values
String within 32 characters
Default
Blank
Supported
Devices
All phones except T48G, T46G, T42G, T41P, T29G, T19(P) E2 and CP920
Case Scen-
ario
The feature access code is *32. A (your phone) monitors party B (number: 8866), party B and party C
is during the call.
Set the following:
blf.listen_barge_in_code = *32
features.blf.show_callinfo.enable = 1
During the call of the monitored line, long press the BLF key and you press the Listen BargeIn soft
key, then the phone calls *328866 to barge in the call. You are automatically muted, so you can hear
all call participants, but no one can hear you.
Related
Parameters
features.blf.show_callinfo.enable
Ethernet Interface MTU Parameters
Parameter
static.network.mtu_value
[1]
<y0000000000xx>.cfg
Description
It configures the Ethernet interface Maximum Transmission Unit (MTU) on the phones.
Permitted
Values
Integer from 1280 to 1500
Default
1500
Parameter
static.network.set_fragment.enable <y0000000000xx>.cfg
Description
It enables or disables the fragmented packet sending.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Supported
Devices
T57W, T54W, T53W, T53, T48U, T46U, T43U, T42U, T48S, T46S, T42S, T41S, T27G and CP920
[1]
If you change this parameter, the phone will reboot to make the change take effect.
SIP Settings Parameters
Parameter
account.X.compact_header_enable
[1]
<MAC>.cfg
Description
It enables or disables the phone to support compact SIP header.
Permitted
0-Disabled

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