Yealink SIP-T31G Administrator's Guide

Network Configurations
57
Parameter
account.X.nat.udp_update_enable
[1]
<MAC>.cfg
Description
It sets the type of keep-alive packets sent by phone.
Permitted
Values
0-Disabled
1-Default (the phone sends the corresponding packets according to the transport protocol)
2-Options (the phone sends SIP OPTIONS packets to the server)
3-Notify (the phone sends SIP NOTIFY packets to the server)
Default
1
Web UI
Account > Advanced > Keep Alive Type
Parameter
account.X.nat.udp_update_time
[1]
<MAC>.cfg
Description
It configures the interval (in seconds) at which the phone sends a keep-alive package.
Note: It works only if “account.X.nat.udp_update_enable” is set to 1, 2 or 3.
Permitted
Values
Integer from 0 to 3600
Default
30
Web UI
Account > Advanced > Keep Alive Interval(Seconds)
[1]
X is the account ID. For T57W/T54W/T48U/T48S/T48G/T46U/T46S/T46G/T29G, X=1-16; for
T53W/T53/T43U/T42G/T42U/T42S, X=1-12; for T41P/T41S/T27G, X=1-6; for T33P/T33G, X=1-4; for
T40P/T40G/T23P/T23G, X=1-3; for T31P/T31G/T31/T21(P) E2, X=1-2; for T30P/T30/T19(P) E2/CP920, X=1.
Rport Configuration
Rport allows a client to request that the server sends the response back to the source IP address and port from
which the request originated. It helps the phone traverse symmetric NATs.
Rport feature depends on support from a SIP server. For more information, refer to RFC 3581.
The following table lists the parameter you can use to configure rport.
Parameter
account.X.nat.rport
[1]
<MAC>.cfg
Description
It enables or disables the phone to add the "rport" parameter in the Via header.
Permitted
Values
0-Disabled
1-Enabled, the INVITE Contact header uses the port in the "rport" parameter but does not use the
source IP address in the "received" parameter in the Via header of server's response.
2-Enable Direct Process, the INVITE Contact header uses the port in the "rport" parameter and uses
the source IP address in the "received" parameter in the Via header of server's response.
Default
0
Web UI
Account > Advanced > RPort
[1]
X is the account ID. For T57W/T54W/T48U/T48S/T48G/T46U/T46S/T46G/T29G, X=1-16; for
T53W/T53/T43U/T42G/T42U/T42S, X=1-12; for T41P/T41S/T27G, X=1-6; for T33P/T33G, X=1-4; for
T40P/T40G/T23P/T23G, X=1-3; for T31P/T31G/T31/T21(P) E2, X=1-2; for T30P/T30/T19(P) E2/CP920, X=1.
SIP Port and TLS Port Configuration
You can configure the SIP and TLS source ports on the phone. Otherwise, the phone uses default values (5060 for
UDP/TCP and 5061 for TLS).

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