Yealink SIP-T31G Administrator's Guide

Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
565
For example, if you set the Always Forward on code to be *78 (may vary on different servers), and the target number
to be 201. When you enable Always Forward on the IP phone, the phone sends *78201 to the server, and then the
server will enable Always Forward feature on the server side, hence being able to get the right status of the exten-
sion.
For anonymous call/anonymous call rejection feature, the phone will send either the on code or off code to the
server according to the value of Send Anonymous Code/Send Rejection Code.
The difference between RFC 2543 Hold enabled and disabled
Capturing packets after you enable the RFC 2543 Hold feature. SDP media direction attributes (such as a=se-
endonly) per RFC 2543 is used in the INVITE message when placing a call on hold.
Capturing packets after you disable the RFC 2543 Hold feature. SDP media connection address c=0.0.0.0 per RFC
3264 is used in the INVITE message when placing a call on hold.
The difference between Shared Call Appearance (SCA) and Bridge Lines
Appearance (BLA)
SCA and BLA are similar signaling methods that enable more than one phone to share a SIP line. The method you
use varies with the SIP server you are using. In the configuration files, the relevant configuration parameters of SCA
and BLA are different. The barge-in and call pull feature are not available with BLA, but they are available with
SCA.

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