Emergency Calls; Emergency Call Support Background - Cisco 8800 Series Manual

Emergency Calls

Emergency Calls

Emergency Call Support Background

Emergency call service providers can register a phone's location for each IP-based phone in a company. The
location information server (LIS) transfers the emergency response location (ERL) to the phone. The phone
stores its location during registration, after the phone restarts, and when a person signs in to the phone. The
location entry can specify the street address, building number, floor, room, and other office location information.
When you place an emergency call, the phone transfers the location to the call server. The call server forwards
the call and the location to the emergency call service provider. The emergency call service provider forwards
the call and a unique call-back number (ELIN) to the emergency services. The emergency service or public
safety answering point (PSAP) receives the phone location. The PSAP also receives a number to call you
back, if the call disconnects.
See Emergency Call Support Terminology, on page 257
the phone.
You insert the following parameters to obtain the phone's location for any phone extension number:
• Company Identifier–A Unique number (UUID) assigned to your company by the NG9-1-1 service
• Primary Request URL–The HTTPS address of the primary server used to obtain the phone location.
• Secondary Request URL–The HTTPS address of a secondary server (backup) used to obtain the phone
• Emergency Number–A sequence of digits that identify an emergency call. You can specify multiple
The phone requests new location information for the following activities:
• You register the phone with the call server.
• A person restarts the phone and the phone was previously registered with the call server.
• A guest signs in to the phone.
• You change the network interface used in the SIP registration. For example, change Wi-Fi to Ethernet.
• You change the IP address of the phone.
If all of the location servers do not send a location response, the phone re-sends the location request every
two minutes.
Cisco IP Phone 8800 Series Multiplatform Phone Administration Guide for Release 11.3(1) and Later
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provider.
location.
emergency numbers, by separating each emergency number with a comma.
Common emergency service numbers include:
• North America–911
• European countries–112
• Hong Kong–999
Cisco IP Phone Configuration
for the terms used to describe emergency calls from