Yealink SIP-T57W Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
303
Default
0
Parameter
sip.skip_redundant_failover_addr <y0000000000xx>.cfg
Description
It enables or disables the phone only to send requests to the servers with different IP addresses when
encountering a failover.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Parameter
account.X.sip_server.Y.expires
[1][2]
<MAC>.cfg
Description
It configures the registration expiration time (in seconds) of SIP server Y for a specific account.
Permitted
Values
Integer from 30 to 2147483647
Default
3600
Web UI
Account > Register > SIP Server Y > Server Expires
Parameter
account.X.sip_server.Y.retry_counts
[1][2]
<MAC>.cfg
Description
It configures the retry times for the phone to resend requests when the SIP server Y is unavailable or
there is no response from the SIP server Y.
The phone moves to the next available server after three failed attempts.
Permitted
Values
Integer from 0 to 20
Default
3
Web UI
Account > Register > SIP Server Y > Server Retry Counts
Parameter
account.X.sip_server.Y.only_signal_with_registered
[1][2]
<MAC>.cfg
Description
It enables or disables the phone to only send requests to the registered server when encountering a
failover.
Note: It works only if “account.X.sip_server.Y.register_on_enable” is set to 1 (Enabled) and “accoun-
t.X.sip_server.Y.failback_mode” is set to 1, 2 or 3.
Permitted
Values
0-Disabled
1-Enabled
Default
0
Parameter
account.X.sip_server.Y.invite_retry_counts
[1][2]
<MAC>.cfg
Description
It configures the number of retries attempted before sending requests to the next available server
when encountering a failover.
Permitted
Values
Integer from 1 to 10
Default
3
Parameter
account.X.sip_server.Y.failback_mode
[1][2]
<MAC>.cfg
Description
It configures the mode for the phone to retry the primary server in failover.
Note: It works only if “account.X.sip_server.Y.address” is set to the domain name of the SIP server.
Permitted
Values
0-newRequests: all requests are sent to the primary server first, regardless of the last server that was
used.
1-DNSTTL: the phone will send requests to the last registered server first. If the time defined by

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