VoIP Study and Implementation VoIP Ecosystem and Strategy Version 1.0 – Author : Marc PYBOURDIN / Julien BERTON Last Update : 15/05/2012

Course objectives The VoIP ecosystem : Understand the VoIP concepts and the different actors on the market Architecture strategy : Understand the differences regarding centralized or distributed architectures. By completing this course, you will see: VoIP ecosystem and architecture strategy

OVERVIEW VoIP Ecosystem and Strategy

Description VoIP (Voice over IP) A set of elements that provide voice transmission through an IP network. ToIP (Telephony over IP) Wide range of telephony services such as Voic Conference rooms IVR … Overview

Why VoIP ? Mobility Cost Speed and reliability of IP networks Overview

Architecture example Overview  Traditional telephony can be linked to VoIP (by using FXO or FXS adapters)

Some vocabulary For VoIP : –IPBX : IP Private branch exchange Asterisk, Cisco Call Manager, Alcatel … To link traditional telephony with VoIP : –FXO : Foreign eXchange Office : Phone line to PSTN –Think about the RJ11 plug on your Internet box(the one that input your analog copper line to your box) –FXS : Foreign eXchange Station : Telephone interface for end-user devices –Usually provide power and dialtone Terms Overview

VoIP Protocols Overview AcronymName SIPSession Initiation Protocol MGCPMedia Gateway Control Protocol IAXInter-Asterisk eXchange SCCPSkinny Client Control Protocol RTPReal-Time Protocol RTCPReal-Time Control Protocol

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THE SIP PROTOCOL VoIP Ecosystem And Strategy

About the protocol Signaling protocol Not used for voice transport Made in 1996 – RFC 3261 Client/Server Mode but can be used in P2P mode The SIP Protocol

The SIP protocol Standard port : 5060 UDP (can work with TCP) Return codes are similar to HTTP protocol –1xx : Information (180 : Ringing, 100 : Trying) –2xx : Success (200 : OK, 202 : accepted) –3xx : Redirection –4xx : Client error (404 : not found, 401 : Unauthorized) –5xx : Server error –6xx : General failure Usage of URL such as : The SIP Protocol

SIP Components –A User Agent (UA) The client part –SIP server –Handles SIP signaling and channel setup –A SIP trunk (optional) –Usually connects to a SIP provider to receive/place calls on PSTN The SIP Protocol

Establishing a communication The SIP Protocol

Description Replace/extend traditional telephony –Local communications –International communications Merge networks together –Convergence => Need of QoS! Provide new services –Services provided by LAN infrastructure VoIP objectives The SIP Protocol

Codecs Protocols-free Algorythm : COmpress / DECompress Compress Human voice in digital packets Implemented –On softwares –On network devices Most used –G.711 µ-Law 64kbps per channel –G.711 a-Law 64 kbps per channel –G kbps per channel Requires licence in some cases The SIP Protocol

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VOIP ARCHITECTURES VoIP Ecosystem And Strategy

Description Deported IPBX VoIP architecture VPN tunnel (optional) Site ASite B IPBX  Site A phones are linked to the Site B IPBX  Site B down = No telephony for site A

Description Local IPBX VoIP architecture VPN tunnel (optional) Site ASite B IPBX  Sites A & B have a dedicated IPBX  Sites A & B are independents IPBX

VoIP actors  SIP trunk providers  OVH  Keyyo  Ippi  ICTelecom  Hardware manufacturers  Cisco/Linksys  Cirpack  Thomson  Aastra  Siemens The SIP Protocol

Desktop SIP clients VoIP architecture  Windows  X-Lite  Mac  Blink  X-Lite  Telephone  Linux  Ekiga  Twinkle

Mobile SIP clients VoIP architecture  iPhone  Acrobits Softphone  Android  Sipdroid  CSipSimple  Telephone  Windows Phone  MobileVoIP  Skype

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