Emergency Call Support Terminology - Cisco 8800 Series Administration Manual

Emergency Call Support Terminology

• 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.
Emergency Call Support Terminology
The following terms describe emergency call support for the Cisco Multiplatform Phones.
• Emergency Location ID Number (ELIN)–A number used to represent one or more phone extensions that
• Emergency Response Location (ERL)–A logical location that groups a set of phone extensions.
• HTTP Enabled Location Delivery (HELD)–An encrypted protocol that obtains the PIDF-LO location
• Location Information Server (LIS)–A server that responds to a SIP-based phone HELD request and
• Emergency Call Service Provider–The company that responds to a phone HELD request with the phone's
• Public Safety Answering Point (PSAP)–Any emergency service (for example, fire, police, or ambulance)
• Universally Unique Identifier (UUID)–A 128-bit number used to uniquely identify a company using
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
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emergency numbers, by separating each emergency number with a comma.
Common emergency service numbers include:
• North America–911
• European countries–112
• Hong Kong–999
locate the person who dialed emergency services.
for a phone from a location information server (LIS).
provides the phone location using a HELD XML response.
location. When you make an emergency call (which carries the phone's location), a call server routes the
call to this company The emergency call service provider adds an ELIN and routes the call to the
emergency services (PSAP). If the call is disconnected, the PSAP uses the ELIN to reconnect with the
phone used to make the emergency call.
joined to the Emergency Services IP Network.
emergency call support.
Cisco IP Phone Administration