Yealink SIP-T57W Administrator's Guide

Account Settings
310
When priorities are equal, weight is used to differentiate the preference. Higher weight is more pre-
ferred.
Permitted
Values
Integer from 0 to 65535
Default
0
Parameter
dns_cache_srv.X.ttl
[2]
<y0000000000xx>.cfg
Description
It configures the time interval (in seconds) that SRV record X may be cached before the record should
be consulted again.
Permitted
Values
Integer from 30 to 2147483647
Default
300
Parameter
dns_cache_a.X.name
[2]
<y0000000000xx>.cfg
Description
It configures the domain name in A record X.
Permitted
Values
Domain name
Default
Blank
Parameter
dns_cache_a.X.ip
[2]
<y0000000000xx>.cfg
Description
It configures the IP address that the domain name in A record X maps to.
Permitted
Values
IP address
Default
Blank
Parameter
dns_cache_a.X.ttl
[2]
<y0000000000xx>.cfg
Description
It configures the time interval (in seconds) that A record X may be cached before the record should be
consulted again.
Permitted
Values
Integer from 30 to 2147483647
Default
300
Parameter
static.network.dns.ttl_enable
[3]
<y0000000000xx>.cfg
Description
It enables or disables the phone to use TTL (Time To Live) in the A record.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Parameter
static.network.dns.last_cache_expired <y0000000000xx>.cfg
Description
It configures the validity period of the expired DNS cache.
Note: It works only if "static.network.dns.last_cache_expired.enable" is set to 1 (Enabled).
Permitted
Values
Integer from 0 to 65535
0-the expired DNS cache can only be used once. After using, the phone will perform a DNS query
again.
1 to 65535-the phone will use the expired DNS cache during the specified period. After that, the
phone will perform a DNS query again.

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