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1、,Identifying DesignConsiderations forVoice ServicesIdentifying Voice Networking Considerations,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The f
2、iles or printed representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-1,Separate Voice and Data NetworksCompanies want to reduceWAN costs by integration.Data is primary traffic onmany voice networks.PSTN architectu
3、re is notflexible enough.PSTN can not integratevoice,data,and video.,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representa
4、tions may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-2,Example:Voice over IP,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,f
5、or the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-3,Example:IP Telephony,2007 Cisco Systems,Inc.All rights reserved.The PDF files and a
6、ny printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-4
7、,Introducing H.323ITU-T standardDescribes packet-based video,audio,and data communicationacross packet-based networksProvides session setup,monitoring,and terminationRefers to a set of other standards:H.225(Q.931):Call signaling H.245:Capability negotiation and media stream management,2007 Cisco Sys
8、tems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes
9、 other than individual self-study.,DESGN v2.07-5,H.323 Components,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representatio
10、ns may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-6,Example:H.323 Components andTheir Interactions,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property o
11、f Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-7,The Importance of a Gatekeeper,2007 Cisco Systems,Inc.All rig
12、hts reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than indi
13、vidual self-study.,DESGN v2.07-8,IP Telephony Components,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may no
14、t beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-9,Design Goals of IP TelephonyTo use end-to-end IP telephony between sites with IP connectivityTo make IP telephony widely usableTo lower long-distance costsTo make IP telephony cost
15、-effectiveTo provide high availability of IP telephonyTo offer lower total cost of ownership and greater flexibilityTo enable new applications on top of IP telephony via third-partysoftwareTo improve remote worker,agent,and work-at-home staffproductivityTo facilitate data and telephony network conso
16、lidation,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be d
17、istributed for purposes other than individual self-study.,DESGN v2.07-10,Single-Site IP Telephony Design,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal s
18、tudy.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-11,Multisite WAN with Centralized CallProcessing Design,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed repre
19、sentation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-12,Multisite WAN
20、with Distributed CallProcessing Design,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commer
21、cial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-13,Call Control and Transport ProtocolsVoice call control functions:Q.931 call setupsignaling H.245 call capabilitycontrol RAS signaling RTP ControlProtocol(RTCP)Voice conversation:Real-Time Transport
22、Protocol(RTP),2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not
23、 be distributed for purposes other than individual self-study.,DESGN v2.07-14,SCCP ControlSCCP is a client-server protocol.SCCP clients register with Cisco Unified CallManager to receivetheir configuration information.Media connections between SCCP clients use RTP.,2007 Cisco Systems,Inc.All rights
24、reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than individu
25、al self-study.,DESGN v2.07-15,SIP ControlSIP is a peer-to-peer protocol.SIP user agents communicate with SIP proxy server.SIP phones can register with Cisco Unified CallManager.,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property
26、 of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-16,MGCP ControlMGCP is a client-server protocol.MGCP gateway
27、translates between endpoints and IP phones.Call agents control MGCP endpoints.,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed
28、representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-17,SummaryBusiness needs are driving the need for unified voice and datanetworks not on the PSTN.The H.323 standard is a foundation for audio,video,and datacomm
29、unications across IP-based networks,including the Internet.IP telephony refers to communication services and voice,facsimile,and voice-messaging applicationsthat are transported via the IP network rather thanthe PSTN.Voice communication over IP relies on control protocols suchas H.323,SCCP,SIP,and M
30、GCP.,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distr
31、ibuted for purposes other than individual self-study.,DESGN v2.07-18,2007 Cisco Systems,Inc.All rights reserved.The PDF files and any printed representation for this material are the property of Cisco Systems,Inc.,for the sole use by Cisco employees for personal study.The files or printed representations may not beused in commercial training,and may not be distributed for purposes other than individual self-study.,DESGN v2.07-19,
