Yealink T40G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
294
could not get through because of the server failure. 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 information 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 emergency 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-If it is set to 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 custom outbound identity
configured by “dialplan.emergency.custom_asserted_id” will be used if the phone fails
to get the LLDP-MED ELIN value.
CUSTOM-If it is set to 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-If it is set to HELD, the IP phone will use the HELD protocol to retrieve location
information from the Location Information Server.
GENBAND-If it is set to GENBAND, GENBAND E911 feature is enabled, the location ID
will be added to the INVITE and REGISTER SIP messages.

Yealink T40G Specifications

General

SIP Accounts	3
Wall Mountable	Yes
Opus Codec	No
Display	2.3 inch 132x64-pixel graphical LCD
Network	Dual-port Gigabit Ethernet
PoE	Yes
Headset Support	Yes, RJ9 port
Power Adapter	Optional
Voice Codecs	G.722, G.711(A/μ), G.729AB, G.726
Local Phonebook	1000 entries