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Yealink SIP-T48U Administrator's Guide

Yealink SIP-T48U
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Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
4
SRTP Configuration
114
Encrypting and Decrypting Files
116
Configuration Files Encryption Tools
116
Configuration Files Encryption and Decryption
116
Contact Files Encryption and Decryption
116
Encryption and Decryption Configuration
117
Incoming Network Signaling Validation
120
Incoming Network Signaling Validation Configuration
120
USB Port Lock
121
USB Port Lock Configuration
121
Firmware Upgrade
123
Firmware for Each Phone Model
123
Firmware Upgrade Configuration
124
Using Handsets with T57W/T54W/T53W/T53 Phones
125
Handset Backlight
125
Handset Backlight Configuration
125
Handset Keypad Light
126
Handset Keypad Light Configuration
126
Handset Wallpaper
127
Handset Wallpaper Configuration
127
Handset Screen Saver
127
Handset Screen Saver Configuration
127
Handset Name
128
Handset Name Configuration
128
Number Assignment
128
Number Assignment Configuration
129
End Call on Hook
130
End Call on Hook Configuration
130
Advisory Tones
130
Advisory Tones Configuration
131
Base PIN
132
Base PIN Configuration
132
DECT Intercom
133
DECT Intercom Configuration
133
Shared Directory
134
Shared Directory Configuration
134
Shared Contact File Customization
134
Shared Contact File Elements and Attributes
135
Customizing Shared Contact File
135
Satellite Mode
135
Satellite Mode Configuration
136
Example: Configuring the Satellite Mode Feature
137
Repeater Settings Parameters
138
Handset Settings Parameters
139

Table of Contents

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Yealink SIP-T48U Specifications

General IconGeneral
Handset typeWired handset
Product typeIP Phone
Product colorGray
USB 2.0 ports quantityUSB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Expansion module supportYes
Ethernet LAN (RJ-45) ports2
Display diagonal7 \
Display resolution800 x 480 pixels
Lines quantity- lines
Phonebook capacity1000 entries
Number of VoIP accounts16
Voice codecsAGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithmsAES, HTTPS, SRTP, TLS
Ethernet LAN data rates10, 100, 1000 Mbit/s
Ethernet LAN interface typeGigabit Ethernet
Front camera-
AC adapter input voltage100 - 240 V
Operating temperature (T-T)0 - 40 °C
Operating relative humidity (H-H)10 - 95 %
Keypad number of keys29
Number of handles included1 pc(s)
Harmonized System (HS) code85171800
Weight and Dimensions IconWeight and Dimensions
Width226 mm
Height185 mm

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