Yealink SIP-T48U Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
530
Result: The target characters %5F remain the same.
Parameter
sip.reserve_characters <y0000000000xx>.cfg
Description
It specifies the characters that the phone does not recognize as the escape one.
Multiple characters are not separated.
Permitted
Values
String
Default
Blank
Supported
Devices
All phones except T48G, T46G, T42G, T41P and T29G
Related
Parameters
sip.escape_characters.enable
Parameter
sip.tcp_port_random_mode
[2]
<y0000000000xx>.cfg
Description
It configures the listening port mode.
Permitted
Values
0-random source port (non 506x), fixed ports (506x) carried in the Contact, Via header.
1-random source port (non 506x) and other ports (non 506x) carried in the Contact, Via header.
Default
1
Parameter
sip.listen_mode <y0000000000xx>.cfg
Description
It configures the listening mode.
Permitted
Values
0-according to the transport protocol
1-listening TCP and UDP
2-listening TCP and UDP, and subscribe for BLF List containing transport=TCP in the Contact header.
Default
0
Parameter
sip.send_response_by_request <y0000000000xx>.cfg
Description
It configures where the IP phone retrieves the destination address for response. The phone will then
send all SIP response messages to the destination address.
Permitted
Values
0-from VIA header in the request message
1-from source address of the request message
Default
1
Parameter
sip.requesturi.e164.addglobalprefix <y0000000000xx>.cfg
Description
It enables or disables the phone to add a global prefix "+" to the E.164 user parts in SIP: URI.
Permitted
Values
0-Disabled
1-Enabled, the phone will automatically add a prefix "+" to the number in the E.164 format when you
dial using the SIP URI (for example 862512345000@sip.com).
Default
0
Parameter
sip.send_keepalive_by_socket <y0000000000xx>.cfg
Description
It enables or disables the phone to send the keep-alive packets based on the transport protocol.
Note: It works only if "account.X.nat.udp_update_enable" is set to 1 (Default).
Permitted
Values
0-Disabled, the phone sends the keep-alive packets based on the account
1-Enabled

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