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
locate the person who dialed emergency services.
• 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
for a phone from a location information server (LIS).
• Location Information Server (LIS)–A server that responds to a SIP-based phone HELD request and
provides the phone location using a HELD XML response.
• Emergency Call Service Provider–The company that responds to a phone HELD request with the phone's
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.
• Public Safety Answering Point (PSAP)–Any emergency service (for example, fire, police, or ambulance)
joined to the Emergency Services IP Network.
• Universally Unique Identifier (UUID)–A 128-bit number used to uniquely identify a company using
emergency call support.
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
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 administration web page. See Access the Phone Web Page, on page 92.
Procedure
Step 1 Click the Voice > Ext n, where n is the phone extension number (1-10) of the phone web dialog.
Step 2 In the Dial Plan area, set the Emergency Number to the digits that correspond to the customer emergency
service numbers.
To specify multiple emergency numbers, separate each emergency number with a comma.
Step 3 In the E911 Geolocation Configuration area, set the Company UUID to the unique customer identifier
obtained from your emergency call service provider.
For example:
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
185
Phone Administration
Emergency Call Support Terminology
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