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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
371
If it is set to a value greater than 0, the phone will wait the designated seconds before dialing out the
preset hotline number when you lift the handset, press the Speakerphone/off-hook key or press the
line key.
Note: Line key is not applicable to T19(P) E2/CP920 phones, handset and Speakerphone key are not
applicable to CP920 phones; the off-hook key is only applicable to CP920 phones.
Permitted
Values
Integer from 0 to 10
Default
4
Web UI
Features > General Information > Hotline Delay(0~10s)
Phone UI
Color Screen Phones:
Menu > Features > Others > Hot Line > Hotline Delay
Black-and-white Screen Phones:
Menu > Features > Hot Line > Hotline Delay
Off Hook Hot Line Dialing
For security reasons, the phones support off hook hot line dialing feature, which allows the phone to automatically
dial out the pre-configured number when you lift the handset, press the Speakerphone key or desired line key. The
SIP server may then prompts you to enter an activation code for call service. Only if you enter a valid activation
code, the phone will use this account to dial out a call successfully.
Off hook hot line dialing feature is configurable on a per-line basis and depends on the support from a SIP server.
The server actions may vary from different servers.
It is also applicable to the IP call and intercom call.
Note: Off hook hot line dialing feature limits the call-out permission of this account and disables the hotline feature. For
example, when the phone goes off-hook using the account with this feature enabled, the configured hotline number will not be
dialed out automatically.
Topic
Off Hook Hot Line Dialing Configuration
Off Hook Hot Line Dialing Configuration
The following table lists the parameters you can use to configure off hook hot line dialing.
Parameter
account.X.auto_dial_enable
[1]
<MAC>.cfg
Description
It enables or disables the phone to automatically dial out a pre-configured number when a user lifts
the handset, presses the Speakerphone/off-hook key or desired line key.
Note: Line key is not applicable to T19(P) E2/CP920 phones; handset and Speakerphone key are not
applicable to CP920 phones; the off-hook key is only applicable to CP920 phones.
Permitted
Values
0-Disabled
1-Enabled, the phone will dial out the pre-configured number (configured by “account.X.auto_dial_
num”).
Default
0
Parameter
account.X.auto_dial_num
[1]
<MAC>.cfg
Description
It configures the number that the phone automatically dials out when a user lifts the handset, presses
the Speakerphone/off-hook key or desired line key.
Note: It works only if “account.X.auto_dial_enable is set to 1 (Enabled). Line key is not applicable to

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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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