Emergency Call Support Terminology; Configure A Phone To Make Emergency Calls - Cisco 7800 Series Administration Manual

Emergency Call Support Terminology

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

Configure a Phone to Make Emergency Calls

Before you begin
• Obtain the E911 Geolocation Configuration URLs and the company identifier for the phone from your
• Access the phone administration web page. See
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
188
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.
emergency call services provider. You can use the same Geolocation URLs and company identifier for
multiple phone extensions in the same office area.
Access the Phone Web Page, on page
Cisco IP Phone Administration
80.