Yealink SIP-T52S Administrator's Guide

Configuring Basic Features
441
Parameters
Permitted Values
Default
None
features.play_hold_tone.delay
Integer from 3 to 3600
30
Description:
Configures the interval (in seconds) at which the IP phone play a warning tone when there is
a call on hold.
If it is set to 30 (30s), the IP phone will play a warning tone every 30 seconds when there is a
call on hold.
Note: It works only if the value of the parameter “features.play_hold_tone.enable” is set to 1
(Enabled).
Web User Interface:
Features->General Information->Play Hold Tone Delay
Phone User Interface:
None
sip.rfc2543_hold
0 or 1
0
Description:
Enables or disables the IP phone to use RFC 2543 (c=0.0.0.0) outgoing hold signaling.
0-Disabled
1-Enabled
If it is set to 0 (Disabled), SDP media direction attributes (such as a=sendonly) per RFC 3264
is used when placing a call on hold.
If it is set to 1 (Enabled), SDP media connection address c=0.0.0.0 per RFC 2543 is used
when placing a call on hold.
Web User Interface:
Features->General Information->RFC 2543 Hold
Phone User Interface:
None
account.X.hold_use_inactive
0 or 1
0
Description:
Enables or disables the IP phone to use inactive outgoing hold signaling.
0-Disabled
1-Enabled
If it is set to 0 (Disabled), SDP media direction attribute “a=sendonly” is used when placing

Yealink SIP-T52S Specifications

General

Touchscreen	-
Display diagonal	2.8 \
Backlight display	Yes
Display resolution	320 x 240 pixels
Lines quantity	16 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	12
AC adapter input voltage	100 - 240 V
Bluetooth version	2.1+EDR
Security algorithms	802.1x RADIUS, HTTPS, MD5
Ethernet LAN interface type	Gigabit Ethernet
USB 2.0 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Voice codecs	G.722, G.723, G.723.1, G.726, OPUS, iLBC
Volume control	Digital
Operating temperature (T-T)	-10 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Front camera	No
Operating system installed	Linux

Weight and Dimensions

Depth	212 mm
Width	211.6 mm
Height	166.8 mm