1. TelecomPrepared by: Salima Rami Imran Layek

2. Agenda1. DTMF2. IVR3. Examples of IVR software4. TCP/ IP5. Telephone network6. VXML/ Telephone server 3. DTMF DTMF (dual tone multi frequency) is the signalto the phone company that you generatewhen you press an ordinary telephones touchkeys Also Known as Touch-tone There are 12 DTMF signals, each of which ismade up of two tones generated from a high& low frequency signal 4. IVR1. Interactive Voice Response (IVR) A technology that allows a computer to interactwith humans through the use of voice and DTMFkeypad inputs2. 3 categories1. Auto Attendant2. Audio text3. Voice mail 5. Examples of IVR Software1. Old School Of thought Using built in API in C++ provided by the CTI manufacturers.2. Web Style development VXML, CCXML, VoicePHP3. Extension of Traditional Development tools like Microsoft .NET VBVoice, Velocity4. Complete New Tool with simple drag and Drop visual tools Envox, Invox, Osidail, XtendIVR, OmniVox3D 6. TCP/IP Transmission Control Protocol & InternetProtocol The communication protocol for the internet. Defines the rule computers must follow tocommunicate with each other over theinternet. 7. Telephone Network Telephone network: A telecommunications network used for telephonecalls between two or more parties Plain old telephone system (POTS): an analog system using analog signalsto transmit voice Types of telephone network: Public switched telephone network (PSTN) Mobile telephone network Private branch exchange (PBX) Public telephone operators (PTOs) 8. Telephone Network Basic Components ofTelephony Networks Edge devices Analog telephones Digital telephones Local loops Private or central office (CO) switches Trunks Tie trunk CO trunk Interoffice trunk 9. Telephone Network Local-access Transport Areas/LATAs: Predefine boundary which can be asmall or large metropolitan area Intra-LATA Services: The services offered by the common carriers(telephone companies) inside a LATA Local exchange carrier (LEC): Thecarrier that handles these services Incumbent local exchange carrier (ILEC): Owns the cabling system (localloops) Competitive local exchange carriers (CLECs):The new carriers that canprovide services Inter-LATA Services :The services between LATAs are handled byinterexchange carriers (IXCs) Points of Presence(POP): Point of Interaction between various LES andILEC 10. Telephone Network Call Signaling: is the ability of a device to communicate a need for serviceto a network Requires the network to detect a request for service and termination ofservice, send addressing information, and provide progress reports to theinitiating party This functionality corresponds to the three call-signaling types: Supervisory signaling: On hook, Off hook, Ringing Address signaling: Dual-tone multi-frequency (DTMF), Pulse Informational signaling :Dial tone, Busy, Congestion, etc Telephone network provide analog and digital service 11. VXML/Telephone Server VoiceXML/VXML: A scripting language for writing Voice enabled IVR andweb services and applications. user input: Speech Recognition and DTMF System output: prerecorded Audio and Text-to-speech VoiceXML Architecture: A typical VoiceXML based system contains the four main components which are, Telephone Network VoiceXML Gateway: VXML Gateway consists of, VoiceXML interpreter integrated with Media resources (Speech Recognition, Text-to-speech, Audio playback) Telephony resources (DTMF, Call Control) Application Server TCP/IP Network 12. VXML/Telephone ServerVoiceXML Architecture:Telephone NetworkVoiceXML Gateway Application ServerTCP/IP Network 13. VXML/Telephone Server Business Advantage of VoiceXML Additional Revenue Opportunities Additional channels for customer care Reduced Staffing, Operating and Maintenance 24/7 Self-service Applications Leverage existing Web Technologies and Networks Improved Customer Satisfaction and Customer Retention Example: A common architecture is to deploy banks of voice browsersattached to the Public Switched Telephone Network (PSTN) to allow usersto interact with voice applications over the telephone.