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Published byQuentin Leonard Modified over 9 years ago
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VOIP : Voice on IP ALMORI Fabien master2 ISTRe
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Table of context VOIP stakes VOIP structure Protocol H.323 Advantages and drawbacks Conclusion
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VOIP stakes Price reductions Triple play network PABX distributed or centralized Telephony IP Video services integrated
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VOIP structure There are computer and phone on the router Possibility to phone an analogical phone One interface for the different devices of telecommunication
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Protocol H.323 OSI model In the Application layer: A function for audio signal A function for video signal In the Transport layer: RAS : for the establishment of call H.245 : for a call with an analogical device H.245 : for to use the good codec. For example: a video call
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Protocol H.323 (in theory) Establishment of call Réservation of the bandwidth with the protocol RSVP (Ressource reSerVation Protocol) Establishment of the audio and video communication Liberation of call
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Example with the protocol
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Advantages and drawbacks Standard codec Interoperability Independence with the network Independence with platforms and applications Support multi-points Management of bandwith Problem of QoS Complexy protocol Problem with the different networks
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Conclusion The VOIP is widespread There are a lot of logiciel what are used (Skype) one network in a society
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This is the end Do you have questions ?
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