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Yealink SIP-T52S Administrator's Guide

Yealink SIP-T52S
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Administrators Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
506
field.
6. (Optional.) Enter the string that will appear on the LCD screen in the Label field.
7. Enter the group call pickup code in the Value field.
8. Press the Save soft key to accept the change.
Dialog Info Call Pickup
Call pickup is implemented through SIP signals on some specific servers. When this feature is
enabled, IP phones support picking up incoming calls via the INVITE message which includes a
Replaces header in the message body. The value of Replaces is derived from a NOTIFY message
with dialog-info event. A user can pick up an incoming call by pressing the DSS key used to
monitor a specific extension (such as the BLF key). For more information on BLF, refer to Busy
Lamp Field (BLF) on page 607.
If the visual alert for blf pickup feature is enabled, a user can also pick up an incoming call by
pressing the DPickup soft key. For more information on visual alert for blf pickup, refer to
Visual Alert and Audio Alert for BLF Pickup on page 611.
It is not applicable to SIP-T19(P) E2/CP860/CP920 IP phones.
Note
Example of the dialog-info carried in NOTIFY message:
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="6" state="partial"
entity="sip:1011@10.2.1.48:5060">
<dialog id="65603" call-id="0_1756536024@10.10.20.34" local-tag="3408640225" remote-
tag="3779921438" direction="recipient">
<state>early</state>
<local>
<identity>sip:1011@10.2.1.48:5060</identity>
<target uri="sip:1011@10.2.1.48:5060"/>
</local>
<remote>
<identity>sip:1058@10.2.1.48:5060</identity>
<target uri="sip:1058@10.2.1.48:5060"/>
</remote>
</dialog>
</dialog-info>
Example of the Replaces carried in INVITE message:
Via: SIP/2.0/UDP 10.10.20.18:5060;branch=z9hG4bK2026058891
From: "1010" <sip:1010@10.2.1.48:5060>;tag=826048502
In this way, you do not need to configure the directed call pickup code.

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Yealink SIP-T52S Specifications

General IconGeneral
Touchscreen-
Display diagonal2.8 \
Backlight displayYes
Display resolution320 x 240 pixels
Lines quantity16 lines
Phonebook capacity1000 entries
Number of VoIP accounts12
AC adapter input voltage100 - 240 V
Bluetooth version2.1+EDR
Security algorithms802.1x RADIUS, HTTPS, MD5
Ethernet LAN interface typeGigabit Ethernet
USB 2.0 ports quantity1
Ethernet LAN (RJ-45) ports2
MountingDesk/Wall
Handset typeWired handset
Product typeIP Phone
Product colorBlack
Voice codecsG.722, G.723, G.723.1, G.726, OPUS, iLBC
Volume controlDigital
Operating temperature (T-T)-10 - 40 °C
Operating relative humidity (H-H)10 - 95 %
Cables includedLAN (RJ-45)
Number of handles included1 pc(s)
Front cameraNo
Operating system installedLinux
Weight and Dimensions IconWeight and Dimensions
Depth212 mm
Width211.6 mm
Height166.8 mm

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