Yealink SIP-T48U Administrator's Guide

Phone Provisioning
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If you change this parameter, the phone will reboot to make the change take effect.
Supported Provisioning Server Discovery Methods
After the phone has established network settings, it must discover a provisioning server to obtain software updates
and configuration settings.
The IP phone supports the following methods to discover the provisioning server address:
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Zero Touch: Zero Touch feature guides you to configure network settings and the provisioning server address
via the phone user interface after startup.
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PnP: PnP feature allows the phones to discover the provisioning server address by broadcasting the PnP
SUBSCRIBE message during startup.
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DHCP: DHCP option can be used to provide the address or URL of the provisioning server to phones. When the
IP phone requests an IP address using the DHCP protocol, the resulting response may contain option 66 (for
IPv4)/option 59 (for IPv6) or the custom option (if configured) that contains the provisioning server address.
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Static: You can manually configure the server address via the phone user interface or web user interface.
Topics
Zero Touch Provision Configuration
PnP Provision Configuration
DHCP Provision Configuration
Static Provision Configuration
Zero Touch Provision Configuration
The following table lists the parameters you can use to configure the Zero Touch provision.
Parameter
static.zero_touch.enable <y0000000000xx>.cfg
Description
It enables or disables the zero touch for the phone to configure the network parameters and pro-
visioning server address via the phone user interface during startup.
Permitted
Values
0-Disabled
1-Enabled
Default
0
Web UI
Settings > Auto Provision > Zero Active
Parameter
static.zero_touch.wait_time <y0000000000xx>.cfg
Description
It configures the duration time (in seconds) for the phone to display Zero Touch screen during startup.
Permitted
Values
Integer from 1 to 100
Default
5
Web UI
Settings > Auto Provision > Wait Time(1~100s)
Parameter
static.zero_touch.network_fail_wait_times <y0000000000xx>.cfg
Description
It configures the reconnection times when zero touch module fails to obtain network parameters.
Permitted
Values
Integer from 1 to 2147483646
Default
8
Parameter
static.zero_touch.network_fail_delay_times <y0000000000xx>.cfg
Description
It configures the duration time (in milliseconds) of every reconnection when zero touch module fails to
obtain network parameters.

Yealink SIP-T48U Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Gray
USB 2.0 ports quantity	USB 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 support	Yes
Ethernet LAN (RJ-45) ports	2
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithms	AES, HTTPS, SRTP, TLS
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Front camera	-
AC adapter input voltage	100 - 240 V
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Keypad number of keys	29
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Width	226 mm
Height	185 mm