Yealink SIP-T31G Administrator's Guide

Call Features
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configured for emergency routing, avoiding that emergency calls could not get through because of the server fail-
ure. If the phone is not locked, it checks against the regular dial plan. If the phone is locked, it checks against the
emergency dial plan.
Enhanced 911
E911 (Enhanced 911) is a location technology that enables the called party to identify the geographical location of
the calling party. For example, if a caller makes an emergency call to E911, the feature extracts the caller's inform-
ation for the police department to immediately identify the caller's location.
Topic
Emergency Dialplan and Enhanced 911 Configuration
Emergency Dialplan and Enhanced 911 Configuration
The following table lists the parameters you can use to configure emergency dialplan and Enhanced 911.
Parameter
dialplan.emergency.enable <y0000000000xx>.cfg
Description
It enables or disables the Emergency dialplan feature.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Parameter
dialplan.emergency.asserted_id_source <y0000000000xx>.cfg
Description
It configures the precedence of the source of emergency outbound identities when placing an emer-
gency call.
Note: If the obtained LLDP-MED ELIN value is blank and no custom outbound identity, the PAI header
will not be included in the SIP INVITE request. It works only if “dialplan.emergency.enable” is set to 1
(Enabled).
Permitted
Values
ELIN-The outbound identity used in the P-Asserted-Identity (PAI) header of the SIP INVITE request is
taken from the network using an LLDP-MED Emergency Location Identifier Number (ELIN). The cus-
tom outbound identity configured by “dialplan.emergency.custom_asserted_id” will be used if the
phone fails to get the LLDP-MED ELIN value.
CUSTOM-The custom outbound identity configured by “dialplan.emergency.custom_asserted_id” will
be used; if “dialplan.emergency.custom_asserted_id” is left blank, the LLDP-MED ELIN value will be
used.
HELD-The phone will use the HELD protocol to retrieve location information from the Location Inform-
ation Server.
GENBAND-Ribbon E911 feature is enabled, the location ID will be added to the INVITE and
REGISTER SIP messages.
Default
ELIN
Parameter
dialplan.emergency.asserted_id.sip_account <y0000000000xx>.cfg
Description
It configures the account to be used to retrieve E911 location information.
Permitted
Values
T57W/T54W/T48U/T48S/T48G/T46U/T46S/T46G/T29G: Integer from 1 to 16;
T53W/T53/T43U/T42U/T42S/T42G: Integer from 1 to 12;
T41P/T41S/T27G: Integer from 1 to 6;
T33P/T33G: Integer from 1 to 4;
T40P/T40G/T23P/T23G: Integer from 1 to 3;

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