c# qr code reader pdf Basic 911 Emergency Service in Visual C#.NET

Reader QR Code in Visual C#.NET Basic 911 Emergency Service

Basic 911 Emergency Service
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Basic 911 emergency service requires invalid mobile stations (ie, mobile stations not associated with any wireless service subscription) to make 911 emergency calls Invalid mobile stations cannot register, although they can be powered on and display radio signal strength If a normal call is made from an invalid mobile station, the network will not complete the call since validation and service qualification cannot be obtained Typical call treatment for these invalid calls consists of voice recordings indicating the call cannot be completed or a series of audible tones
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Other Technologies Related to ANSI-41
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ANSI-41 Network Implementations
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There are many problems with the basic 911 mandate, although the concept has good intentions:
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Invalid mobile stations have no identity and no subscription associated with an HLR This allows nuisance 911 calls to be made with no indication of who the calling party is Invalid mobile stations do not receive a bill for wireless service This allows people to avoid paying emergency service fees associated with wireless service These fees are used to subsidize the infrastructure to provide wireless emergency services and are usually included in the subscriber s bill Wireless service providers are required to complete emergency service calls to invalid mobile stations with no way of recouping revenue for the call delivery and resources used in the network Callback information is unavailable to invalid mobile stations making 911 emergency calls In wire-line networks, the PSAP retains supervision over 911 calls, and can seize the line associated with the directory number regardless of whether or not the calling party disconnects The wireless service provider has no way of calling back the invalid mobile station if the call is dropped or otherwise disconnected
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Phase I E-911 Emergency Service
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Phase I E-911 emergency services is standardized in J-STD-034 Wireless Enhanced Emergency Services Phase I of these emergency services requires the following capabilities:
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Callback from the PSAP to the mobile station originating the 911 call Location information in the form of cell or cell-sector identification Selective routing of the 911 call to the appropriate PSAP Automatic reconnection to the mobile station calling 911 when the mobile station disconnects due to loss of radio coverage or other radio propagation anomalies Three-way 911 calls, if the three-way calling feature is subscribed to
Callback is required so that a PSAP operator can call back a mobile phone previously used to make a 911 emergency call This is necessary if the 911 calling party has disconnected before enough information was obtained, if there is a problem locating the emergency, or if investigations are required following an emergency The callback feature requires
Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
Other Technologies Related to ANSI-41
19:
Other Technologies Related to ANSI-41
a valid mobile station that has transmitted the MIN or MDN to the serving system during call establishment Location information is provided in the form of cell-site or cell-sector identification This identification is transmitted in the form of a unique directory number belonging to the emergency services network This number can be associated with the cell site or sector and the PSAP to which to deliver the call Selective call routing of E-911 calls is necessary to associate the 911 call with the correct PSAP This can be done by using the unique directory number employed to identify the cell site or sector Such a number can be used to associate the calling party s location with the correct PSAP to obtain emergency services This number is known as the emergency services routing digits (ESRD) Figure 192 shows E-911 emergency call selective routing with callback while a subscriber is roaming
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