Introduction to VOIP
Short summary:
VOIP Hardware. . PSTN Gateways. . Telephone adapters. . Handsets. . Softswitch/PBX. . (Much of this can actually be done on a PC) ...
Long summary:
Introduction to VOIPPage 1Introduction to VOIPStephen OkayAbdus Salam Intl Center for Theoretical PhysicsTrieste Italy February 23 2005Page 2Intro to VOIPClassic TelephonyData Networks(Review)VOIPWhat it isProtocolsHardwareSoftwareExamplesWeb LinksPage 3Classic Telephony in 1 slideClassic TelephonyCalls happen by electromechanicalmanipulation of voltage levels betweentelco network and phones.Modern service replaces somecomponents w/ electronics but must stillwork w/ legacy equipment.This makes upgrades and enhancementsdifficult and expensive.Page 4VOIP in 1 slideManipulate bits not voltseverything can now happen inside a PCCan be alldigital or a mix of digital andanalog equipmentTelephone Company/PTT not requiredCan use lowpower commodity hardwarePage 5Intro to VOIPIntrovoice chat applications vs. VOIPprotocolsVOIP protocolsH323SIPVOIP hardwarePage 6Voice chatpointtopoint or serverbased.very low bandwidthoften proprietaryOften no routing between PSTN or othernetworksPage 7VOIPUses formal protocol suites to provide:Call routing forwarding voicemail etc.Compatibility w/ legacy PSTN/POTSsystemsQuality of Service(QOS)Done mostly w/ softwareCan still do pointtopoint callsPage 8Major VOIP benefitsIts all just bits.VOIP is just another application running overa data network(usually TCP/IP)Service expansion/integration often just amatter of writing the codePercall costs very low often freeEquipment can be a commodity not specializedtechnology.Page 9VOIP ProtocolsH.323SIPMGCPOthersPage 10VOIP Call lifecycleDescribe setup communication and teardownof a VOIP callPage 11H.323Official ITU VOIP protocolWide support among all telecom providers &manufacturers even in developing regions.Industry moving away from using it in newproducts.Meant to provide gateway for telephonydevices into the PSTNPage 12SIPSession Initiation ProtocolDesigned by Cisco Systems Inc.Standalone computertocomputer protocolDoes not presume a PSTNCalls routed/managed by a SIP ServerNo real official ver ...
Source: wireless.ictp.trieste.it
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