Yealink SIP-T52S Administrator's Guide

Configuring Advanced Features
775
Parameters
Permitted Values
Default
None
Phone User Interface:
None
account.X.static_cache_pri
0 or 1
0
Description:
Configures whether preferentially to use the static DNS cache for domain name resolution
of the server for account X.
0-Use domain name resolution from the DNS server preferentially
1-Use static DNS cache preferentially
X ranges from 1 to 16 (for SIP-T54S/T48G/T48S/T46G/T46S/T29G)
X ranges from 1 to 12 (for SIP-T52S/T42G/T42S)
X ranges from 1 to 6 (for SIP-T41P/T41S/T27P/T27G)
X ranges from 1 to 3 (for SIP-T40P/T40G/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860/CP920)
Example:
account.1.static_cache_pri = 1
Web User Interface:
None
Phone User Interface:
None
Real-Time Transport Protocol (RTP) Ports
The Real-time Transport Protocol (RTP) is a network protocol for delivering audio over IP
networks. The phone is compatible with RFC 1889 - RTP: A Transport Protocol for Real-Time
Applications - and the updated RFC 3550. It treats all RTP streams as bi-directional from a
control perspective and expects that both RTP end points will negotiate the respective
destination IP addresses and ports.
You can specify the IP phone’s RTP port range. Since the IP phone supports conferencing and
multiple RTP streams, it can use several ports concurrently. The UDP port used for RTP streams
is traditionally an even-numbered port. For example, the default RTP min port on the IP phones
is 11780. The first voice session sends RTP on port 11780. Additional calls would then use ports
11782, 11784, 11786, etc. up to the max port.

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