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

2. 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

3. OVERVIEW VoIP Ecosystem and Strategy

4. 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 Voicemail Conference rooms IVR … Overview

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

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

7. 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

8. 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

9. Any questions?

10. THE SIP PROTOCOL VoIP Ecosystem And Strategy

11. 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

12. 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 : sip:1568@sip-server.org The SIP Protocol

13. 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

14. Establishing a communication The SIP Protocol

15. 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

16. 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.729 8 kbps per channel Requires licence in some cases The SIP Protocol

17. Any questions?

18. VOIP ARCHITECTURES VoIP Ecosystem And Strategy

19. 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

20. 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

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

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

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

24. Any questions?