Yealink T5 Series Administrator's Guide

Call Features
221
Emergency Dialplan and Enhanced 911
You can dial the emergency telephone number (emergency services number) at any time when the IP phone is
powered on and has been connected to the network. It is available even if your phone keypad is locked or no SIP
account is registered.
Yealink phones support emergency dialplan and enhanced 911.
Emergency Dial Plan
You can configure the emergency dial plan for the phone (for example, emergency number, emergency routing). The
phone determines if this is an emergency number by checking the emergency dial plan. When placing an emergency
call, the call is directed to the configured emergency server. Multiple emergency servers may need to be configured for
emergency routing, avoiding that emergency calls 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 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-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 “dial-
plan.emergency.custom_asserted_id” will be used; if “dialplan.emergency.custom_asserted_id” is left
blank, the LLDP-MED ELIN value will be used.
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 T5 Series Specifications

General

Brand	Yealink
Model	T5 Series
Category	IP Phone
Language	English