vb.net barcode generator How Softswitch Handles E911 and CALEA Requirements in Software

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How Softswitch Handles E911 and CALEA Requirements
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No two features get more discussion than E911 and CALEA. Incumbent service providers have invested millions of dollars in their infrastructures to comply with legal requirements to provide these features. When VoIP switches first came on the market, vendors of circuit switches used the lack of E911 and CALEA in those fledgeling devices as a means to spread fear, uncertainty, and doubt regarding the viability of VoIP and VoIP platforms. Much has changed in the last few years. Some softswitch vendors now offer E911 and CALEA features. It should be stated here that only primary line service providers in the United States are required to offer these features. Long-distance service providers are not required to offer these services. Cell phone service providers are not required to provide E911. An internet subscriber is not required by law to subscribe to E911 or CALEA when making VoIP calls from their computer. Most service providers outside the United States are not required to provide E911 or CALEA. Softswitch vendors should note that perhaps a majority of the world's voice traffic travels on networks that have no requirement for E911 and CALEA.
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One obstacle to the wide deployment of softswitch is accommodating the demands of Enhanced 911 (E911) service. Although 911 services enable users to quickly request service from emergency personnel, E911 goes a step further by using ANI to relate location information to that number and determine which public service answering point (PSAP) should handle the call. In an enterprise setting, it is not only important for E911 to direct emergency services to a particular building, but to indicate from where in the building the 911 call originated. Typically, when someone dials 911 from their desk, the ANI information that reaches the PSAP is based on the company s general, seven-digit phone number associated with the PBX, not the user s extension. In a life-and-death circumstance, that incorrect information can create harmful delays. As a result, some local and state governments make incorporation of E911 services a legal obligation. To that end, many private phone system vendors have incorporated ways for PBXs to fulfill these E911 requirements.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) 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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Different vendors offer different strategies toward accommodating the demands of E911. The most straightforward way is to relate circuit terminations to an extension number. In a traditional PBX environment, each phone jack is associated with a particular extension. When a 911 call is placed from a particular location, the PBX sends a seven-digit number associated with that extension to a central office router, which can then use ANI to route the call to the correct PSAP. The PSAP can then furnish emergency personnel with that special number s location information. However, in a packetized network, the circuit-switched world s E911 fix doesn t apply to SIP (or any other VoIP protocol). Since SIP phones and other VoIP devices become floating network appliances that can attach to the network from any point, their location isn t static. Just like a laptop, a SIP phone can connect anywhere on a company s network; all it needs is a valid IP address. If the phone can be anywhere, then how can a company s phone system serve the E911 network with the necessary information Several fixes to this problem have arisen from within the SIP community:
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Install Global Positioning System (GPS) chipsets in SIP end-user devices that can provide geographic location information. Simply have users log on to their devices when moving them from one location to another. If an SIP deployment makes use of preexisting voice cabling to create a second, VoIP-only network, the IP PBX can relate circuit terminations to Direct Inward Dialing (DID) lines in much the same way as a circuit-switched PBX.
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Whatever the solution, fixes to the E911 issue will have to be standardized across SIP products from all vendors since the E911 space is regulated.13
Communications Assistance for Law Enforcement Act (CALEA)
CALEA is a U.S. law providing for the wiretapping (intercept) of information from a telecommunications network. CALEA dates from the 1990s and
Mitel Networks Corporation. SIP at the Desktop Intelligence to the Edge. September 2001, pg. 7. A white paper from Mitel, available online at www.sipcenter.com/files/SIP_at_the_ Desktop.pdf.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Features and Applications: It s the Infrastructure, Stupid!
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