Yealink SIP-T48U Administrator's Guide

Call Features
368
3-DNS-NAPTR
Default
0
Parameter
dialplan.emergency.X.value
[2]
<y0000000000xx>.cfg
Description
It configures the emergency number to use on your phones so a caller can contact emergency ser-
vices in the local area when required.
Note: It works only if “dialplan.emergency.enable” is set to 1 (Enabled) and “dial-
plan.emergency.asserted_id_source” is not set to HELD.
Permitted
Values
Number or SIP URI
Default
When X = 1, the default value is 911;
When X = 2-255, the default value is Blank.
Parameter
dialplan.emergency.X.server_priority
[2]
<y0000000000xx>.cfg
Description
It configures the priority of which the emergency servers to be used first.
Multiple values are separated by commas. The servers to be used in the order listed (left to right).
The IP phone tries to make emergency calls using the emergency server with higher priority, and then
with lower priority. The IP phone tries to send the INVITE request to each emergency server three
times.
Note: If the account information has been configured (no matter whether the account registration suc-
ceeds or fails), the emergency calls will be dialed using the following priority: SIP server > emergency
server; if not, the emergency server will be used. It works only if “dialplan.emergency.enable” is set to
1 (Enabled). And “dialplan.emergency.asserted_id_source” is not set to HELD.
Permitted
Values
a combination of digits 1, 2 and 3
Default
1, 2, 3
Parameter
dialplan.emergency.held.server_url <y0000000000xx>.cfg
Description
It configures the primary Location Information Server URL for the phone to send HELD location
request.
Note: It works only if “dialplan.emergency.enable” is set to 1 (Enabled) and “dial-
plan.emergency.asserted_id_source” is set to HELD.
Permitted
Values
String
Default
Blank
Parameter
dialplan.emergency.held.secondary.server_url <y0000000000xx>.cfg
Description
It configures the secondary Location Information Server URL for the phone to send HELD location
request.
Note: It works only if “dialplan.emergency.enable” is set to 1 (Enabled) and “dial-
plan.emergency.asserted_id_source” is set to HELD.
Permitted
Values
String
Default
Blank
Supported
Devices
All phones except T48G, T46G, T42G, T41P and T29G
Parameter
dialplan.emergency.held.request_type <y0000000000xx>.cfg

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