Yealink SIP-T48U Administrator's Guide

Configuration Parameters
529
Values 1-Enabled
Default
0
Parameter
sip.unreg_with_socket_close <y0000000000xx>.cfg
Description
It enables or disables the phone to close the socket immediately when the user deregisters the cor-
responding account(s).
Permitted
Values
0-Disabled
1-Enabled
Default
0
Parameter
account.X.check_cseq.enable
[1]
<MAC>.cfg
Description
It enables or disables the phone to check if the CSeq sequence number in the request is lower than
that in the previous request on the same dialog.
Permitted
Values
0-Disabled
1-Enabled. If the CSeq sequence number in the request is lower than that in the previous request, the
phone will reject the request.
Default
1
Parameter
account.X.check_to_tag.enable
[1]
<MAC>.cfg
Description
It enables or disables the phone to check if the To-tag is carried in the To header in renewal request.
Permitted
Values
0-Disabled
1-Enabled. If the To-tag does not exist, the phone will reject the request.
Default
0
Parameter
features.call_invite_format <y0000000000xx>.cfg
Description
It configures the format of callee field in the INVITE message.
Permitted
Values
0-sip:XXX
1-tel:Number, you need to set “account.X.outbound_proxy_enable" to 1.
Default
0
Parameter
sip.escape_characters.enable <y0000000000xx>.cfg
Description
It enables or disables the phone to convert ASCII code into corresponding symbol.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Case Scen-
ario
Target characters: %5F (escape character % plus the ASCII characters 5F)
1. If you want to convert the ASCII code, set the following:
sip.escape_characters.enable = 1
sip.reserve_characters = %NULL%
Result: The target characters %5F are converted to _.
2. If you do not want to convert the ASCII code, set the following:
sip.escape_characters.enable = 0
sip.reserve_characters = %

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