Yealink SIP-T31G Administrator's Guide

Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
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If it is the first time you place a call via the web user interface, the LCD screen will prompt the message “Allow
remote control?”. Press OK on the phone to allow remote control and then the phone will automatically dial out the
number.
Note: You can also place an IP direct call via the web user interface. The IP phone supports either IPv4 or IPv6 address.
Voice Mail
Yealink phones support voice mail.
You can configure a message waiting indicator (MWI) to inform users how many messages are waiting in their mail-
box without calling the mailbox. Yealink phones support both audio and visual MWI alert when receiving new voice
messages.
Topic
MWI for Voice Mail Configuration
MWI for Voice Mail Configuration
Yealink phones support both solicited and unsolicited MWI.
Unsolicited MWI: The IP phone sends a SUBSCRIBE message to the server for message-summary updates. The
server sends a message-summary NOTIFY within the subscription dialog each time the MWI status changes. Unso-
licited MWI is a server related feature.
Solicited MWI: The IP phone can subscribe to the MWI messages to the account or the voice mail number. For soli-
cited MWI, you must enable MWI subscription feature on the phones.
The following table lists the parameters you can use to configure MWI for voice mail.
Parameter
account.X.subscribe_mwi
[1]
<MAC>.cfg
Description
It enables or disables the phone to subscribe to the message waiting indicator.
Permitted
Values
0-Disabled, the server automatically sends a message-summary NOTIFY in a new dialog each time
the MWI status changes. (This requires server support).
1-Enabled, the phone will send a SUBSCRIBE message to the server for message-summary updates.
Default
0
Web UI
Account > Advanced > Subscribe for MWI
Parameter
account.X.subscribe_mwi_expires
[1]
<MAC>.cfg
Description
It configures MWI subscribe expiry time (in seconds).
Note: It works only if “account.X.subscribe_mwi” is set to 1 (Enabled).
Permitted
Values
Integer from 0 to 84600
Default
3600
Web UI
Account > Advanced > MWI Subscription Period (Seconds)
Parameter
account.X.mwi_parse_terminated
[1]
<MAC>.cfg
Description
It enables or disables the phone to parse the Terminated attribute in the received MWI NOTIFY mes-
sage.
Permitted
0-Disabled

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