Yealink SIP-T53W Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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If it is set to a value greater than 0, the phone will wait the designated seconds before dialing out the
preset hotline number when you lift the handset, press the Speakerphone/off-hook key or press the
line key.
Note: Line key is not applicable to T19(P) E2/CP920 phones, handset and Speakerphone key are not
applicable to CP920 phones; the off-hook key is only applicable to CP920 phones.
Permitted
Values
Integer from 0 to 10
Default
4
Web UI
Features > General Information > Hotline Delay(0~10s)
Phone UI
Color Screen Phones:
Menu > Features > Others > Hot Line > Hotline Delay
Black-and-white Screen Phones:
Menu > Features > Hot Line > Hotline Delay
Off Hook Hot Line Dialing
For security reasons, the phones support off hook hot line dialing feature, which allows the phone to automatically
dial out the pre-configured number when you lift the handset, press the Speakerphone key or desired line key. The
SIP server may then prompts you to enter an activation code for call service. Only if you enter a valid activation
code, the phone will use this account to dial out a call successfully.
Off hook hot line dialing feature is configurable on a per-line basis and depends on the support from a SIP server.
The server actions may vary from different servers.
It is also applicable to the IP call and intercom call.
Note: Off hook hot line dialing feature limits the call-out permission of this account and disables the hotline feature. For
example, when the phone goes off-hook using the account with this feature enabled, the configured hotline number will not be
dialed out automatically.
Topic
Off Hook Hot Line Dialing Configuration
Off Hook Hot Line Dialing Configuration
The following table lists the parameters you can use to configure off hook hot line dialing.
Parameter
account.X.auto_dial_enable
[1]
<MAC>.cfg
Description
It enables or disables the phone to automatically dial out a pre-configured number when a user lifts
the handset, presses the Speakerphone/off-hook key or desired line key.
Note: Line key is not applicable to T19(P) E2/CP920 phones; handset and Speakerphone key are not
applicable to CP920 phones; the off-hook key is only applicable to CP920 phones.
Permitted
Values
0-Disabled
1-Enabled, the phone will dial out the pre-configured number (configured by “account.X.auto_dial_
num”).
Default
0
Parameter
account.X.auto_dial_num
[1]
<MAC>.cfg
Description
It configures the number that the phone automatically dials out when a user lifts the handset, presses
the Speakerphone/off-hook key or desired line key.
Note: It works only if “account.X.auto_dial_enable” is set to 1 (Enabled). Line key is not applicable to

Yealink SIP-T53W Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP mobile phone
Product color	Gray
Keypad illumination	Yes
Wi-Fi standards	802.11a, 802.11g, Wi-Fi 4 (802.11n)
Bluetooth version	4.2
Security algorithms	AES, HTTPS, SIPS
Networking standards	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	8 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	12
AC adapter input voltage	100 - 240 V
AC adapter output current	1.2 A
AC adapter output voltage	5 V
Power consumption (typical)	2.3 W
Volume control	Buttons
Number of programmable keys	8
Storage temperature (T-T)	-30 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Display diagonal	3.7 \
Display resolution	360 x 160 pixels
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Number of DECT wireless handsets	4
Voice codecs	G.722, G.723.1, G.726, G.729A, G.729B, OPUS, iLBC

Weight and Dimensions

Depth	210.6 mm
Width	212 mm
Height	174.5 mm