Yealink SIP-T52S Administrator's Guide

Configuring Basic Features
469
Call Transfer
Call transfer enables IP phones to transfer an existing call to a third party. For example, if party
A is in an active call with party B, party A can transfer this call to party C (the third party). Then,
party B will begin a new call with party C and party A will disconnect.
IP phones support call transfer using the REFER method specified in RFC 3515 and offer three
types of transfer:
 Blind Transfer -- Transfer a call directly to another party without consulting. Blind transfer
is implemented by a simple REFER method without Replaces in the Refer-To header.
 Semi-attended Transfer -- Transfer a call after hearing the ringback tone. Semi-attended
transfer is implemented by a REFER method with Replaces in the Refer-To header.
 Attended Transfer (Consultative Transfer) -- Transfer a call with prior consulting.
Attended transfer is implemented by a REFER method with Replaces in the Refer-To
header.
Normally, call transfer is completed by pressing the transfer key. Blind transfer on hook and
attended transfer on hook features allow the IP phone to complete the transfer through on-
hook.
When a user performs a semi-attended transfer, semi-attended transfer feature determines
whether to display the prompt "n New Missed Call(s)" ("n" indicates the number of the missed
calls) on the destination party’s phone LCD screen.
Procedure
Call transfer can be configured using the following methods.
Central
Provisioning
(Configuration
File)
<y0000000000xx>.cfg
Specify whether to complete the
transfer through on-hook.
Parameters:
transfer.blind_tran_on_hook_enable
transfer.on_hook_trans_enable
Configure semi-attended transfer
feature.
Parameter:
transfer.semi_attend_tran_enable
Web User Interface
Specify whether to complete the
transfer through on-hook.
Configure semi-attended transfer
feature.
Navigate to:
http://<phoneIPAddress>/servlet?p=f
eatures-transfer&q=load

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