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I/ OVERVIEW OF VoIP SYSTEM

I/ OVERVIEW OF VoIP SYSTEM. Definition The connection types VoIP network components Action procedure Strengths and weaknesses ( compare with telephone) . I/ 1. Definition of VoIP.

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I/ OVERVIEW OF VoIP SYSTEM

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  1. I/ OVERVIEW OF VoIP SYSTEM • Definition • The connection types • VoIP network components • Action procedure • Strengths and weaknesses ( compare with telephone)

  2. I/ 1. Definition of VoIP • Voice over Internet Protocol (Voice over IP, VoIP) is a family of technologies, methodologies, communication protocols, and transmission techniques for the delivery of voice communication and multimedia sessions over Internet Protocel (IP) networks. • Other terms frequently encountered and often used synonymously with VoIP are • IP telephony • Internet telephony • Voice over broadband (VoBB) • Broadband telephony, and broadband phone.

  3. I/ 2. The connection types • Computer to computer • Use Internet • Free service • Caller and receiver using a common VoIP service (Skype, MSN, Yahoo Messenger, ...), 2 headphone + microphone, sound card. • Computer to phone • Use Internet • Charges service: pay to have an account and software • Phone to phone • Not use Internet, use a VoIP adapter connect to phone -> IP phone • Charges service

  4. I/ 3. VoIP network components • User Agent • In a VoIP network, any device that can make or receive telephone calls is called a User Agent (UA). Each User Agent contains a User Agent Server(UAS) and a User Agent Client (UAC • Gateways • A gateway is a device which acts as a bridge between VoIP and the PSTN network • Proxy servers • In a SIP system, a proxy server (used with a registrar and a location server), can provide the following services: • Call Routing including URI translation. • Registration. • Access (authentication) to a SIP network.

  5. I/ 4. Action procedure Voice  digital bit  packets  voice • Call Setup: • Proxy server make a connection between caller’s and recipient's address. • Voice data processing • Speech signal (convert to) digital signal (compressed and encrypted) voice samples (insert into) RTP packet (transmitted by UDP protocol) -> recopient

  6. I/ 5. Strengths and weaknesses • Strengths: • Costs • Applications • Easy to enjoy • Change • Weaknesses • Quality of service • Susceptibility to power failure • Security • Caller ID • Fax handling

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