Yealink SIP-T31G Administrator's Guide

Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
535
sip.escape_characters.enable = 0
sip.reserve_characters = %
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).

Yealink SIP-T31G Specifications

General

Mounting kit	Yes
Number of handles included	1 pc(s)
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Voice codecs	G.722, G.729, AGC, G.729A, AJB, PLC, G.711Mu, VAD, G.711a, G.723.1, G.726, iLBC, CNG, OPUS
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	3 W
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
Sustainability certificates	RoHS, REACH
Networking standards	IEEE 802.3af, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1x
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	189 mm
Width	188 mm
Height	162 mm
Package depth	210 mm
Package width	213 mm
Package height	103 mm