VOIP & Asterisk introduction - Profoss

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AWT www.awt.beTechnologiesInternet driven: network is king•Distributed technologiesSession Initiation Protocol : std IETF his simplicity pushes it as the alternative to H.323de facto ‘s standard for multimedia communications NgN networksa cousin of HTTP (web)ooooSignalling messages de signalisation are text basedThe result of a real reflexion ‘from scratch’ on how to do VoIP in anworlwide IP networkreuses many existing and standardized protocols which are well knownand established (DNS, SMTP, …)Inherit of all R&D efforts which have been made on IP protocols designstrongest strength is mobility, nomadicity and forking (one ID with manylocations!)<strong>Profoss</strong> oct. 2007 - 38
AWT www.awt.be•SIP Component:TechnologiesInternet driven: network is kingIP phone is named a User Agent (UA)distribution of the functionalities Registrar, Proxy and Redirect servers‘Location Service’ (LS) to memorise the User-Location(s) records•Servers rolesRegistrar takes care of the user-location associations and potential telephony services preferenceso Bind a user’s phone endpoint with an IP network location (address+port)LS is similar to a White Pages serviceProxy takes care of routing the messages to the right network destination(s)•User addressing is at your convenienceUser-Resource association is a Universal Ressource Identified (URI)« protocol:username@domain »o sip:carmelo@awt.be SIP accounto tel:+3281778080 SIP account alias (may or may Not be my desktop office phone)o mailto:carmelo@awt.be Mail accounto http://www.awt.be/~carmelo Employee web spaceA URI identifies a person, a resource or a group BUT not a dedicated hardware phone!•ActorsA technologie to map a URI to a phone number E.164 and vice versa:tElephone NUmber Mapping (ENUM)majors understood the evolution; brand new architecture: Alcatel-Lucent, Avaya, Siemens, Nortel,...news comers are also strongly present:o Cisco (Communication Manager 6), Microsoft, BroadSoft, Indigo Software, Radvision, Adobe, ….o Open Source SipExpressRouter, OpenSER, SipFoundry (Pingtel opening its code), …<strong>Profoss</strong> oct. 2007 - 39
Page 9 and 10: Network convergence and adoption of
Page 11 and 12: Why voice over packet ?•Initially
Page 13 and 14: Which is the right moment to give u
Page 15 and 16: AWT www.awt.beVoIP is not theperfec
Page 17 and 18: ToIP ‘s deployment scalesAWT www.
Page 19 and 20: IP Phone variationsAWT www.awt.be
Page 21 and 22: AWT www.awt.beOperation principles
Page 23 and 24: Internet sharing (PAT/NAT) is a pro
Page 25 and 26: Security challenges in IP telephony
Page 27 and 28: What are the protections ?AWT www.a
Page 29 and 30: AWT www.awt.beIP telephony has many
Page 31 and 32: Deployment models«The deployment s
Page 33 and 34: TechnologiesTelco driven: PBX is ki
Page 37: AWT www.awt.beAsterisk market view
Page 41 and 42: AWT www.awt.beIPtel economy in the
Page 43 and 44: AWT www.awt.beConclusionKey advices

VOIP & Asterisk introduction - Profoss

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