TMCnet News
TECHtionary Case Study - Solving Lifeline & Emergency 911 with Pannaway's Primary Line VoIP SolutionTECHtionary Case Study - Solving Lifeline & Emergency 911 with Pannaway's Primary Line VoIP Solution in a one minute animated tutorial available at www.techtionary.com Natural disasters are an everyday occurrence. Power outages need not cause service interruptions during emergencies. Pannaway's SCN-Service Convergence Network RT-Remote Terminal provides up to 8 eight hours of battery-backup-to-the-premise of up to 2,000 customers. Pannaway's SCN-Service Convergence Network provides packet to TDM-Time Division Multiplexing termination of E911 services and all traditional Class 5 features inside the CO-Central Office. Pannaway addresses critical Lifeline and E911 despite power outages without separate telephone numbers as well as all FCC mandates today. For more on Pannaway’s solutions, go to www.pannaway.com. E911 Background According to the National Emergency Number Association, the main characteristic of E-911 is the capability of the E-911 Tandem CO-Central Office to selectively route a 911 call originated from any station (telephone number) in the E-911 service area to the correct primary (controlling) PSAP-Public Service Answering Point designated to serve the originating station's location. Here is an example of the E911 call processing via SIP. User A picks up phone, SIP Client generates dial tone and waits for dialing. 911 digits are collected and validated at the Client. Once a valid number has been dialed, an invite is sent to the proxy. User is authenticated by VoIP Server, call parameters are evaluated for special handling (E911, CALEA, forwarding, etc.). Since call is off-LAN, the trunk connection is made to CO switch or direct trunking to E911 Tandem via CAMA-Centralized Automatic Message Accounting trunk. With CAMA trunks, the "End User Hold" feature keeps that call activated with the PSAP operator, displaying the calling party number even if the call is disconnected. Some other common E911 features are: - Alternate Routing is a standard service to send a 911 call to another PSAP based on traffic busy, failure or night service. - Selective Routing is a standard service which routes a 911 to the appropriate Primary PSAP based on the calling party's telephone number. - Central Office Transfer is a standard service available for each PSAP via the E-911 Tandem Central Office to another PSAP or other DN-Directory Number. ALI-Automatic Location Identifier request consists of 14 or 16 ASCII-American Standard Code for Information Interchange in the format shown in the tutorial. Here is the digital composition: NPA-Number Planning Area - 3 digits, NPD-Number Planning Digit - 1 Digits used to identify the caller's Area Code, NNX-NXX-Central Office eXchange Code - 3 Digits used to identify the caller's eXchange (wire center), TN-Telephone Number - 4 Digits used to identify the caller's telephone number, POS-Position - 2 Digits - 00 to 99 decimal provided by the PSAP equipment to identify the position associated with the request, TRK-Trunk - 2 Digits - 00 to 94 decimal 95 to 99 for special trunks used to identify the caller's trunk number, CHECK - 1 Digit CRC-Cyclic Redundancy error CHECK previous packet (digits) to be divisible by 8 and CR-Carriage Return - 1 Digit to signal end of request. Since this is a complex subject, please refer to National Emergency Number Association at www.nena.org. There are many more details regarding call handling, recording, and management as well as facilities, power, trunking and other issues. Please contact the National Emergency Number Association at www.nena.org or Associated Public Communications Officers at www.apcointl.org. Related topics such as SS7-Signaling System 7, ANI-Automatic Number Identification, trunking, signaling and other technical issues can be found hereinafter or elsewhere in TECHtionary – www.techtionary.com. TECHtionary (www.techtionary.com) is the World's First and Largest Animated (rich media) Library/Magazine on Technology as well as Web Hosting Magazine’s Editor’s Choice for Technical Help. Get the analysis and more than 2,630+ free tutorials on data, internet, wireless, VoIP-Voice over Internet Protocol (internet telephony), PBX systems, central office switching, protocols, telephony, telecommunications, networking, routing, IPTV, WiMax, power systems, broadband, WiFi-Wireless Fidelity and other technologies, TECHtionary.com provides "just enough – just-in-time" critical success information. |