1、Describe Cisco VoIP Implementations,Implementing Voice Support in an Enterprise Network,Enterprise Voice Implementations,Enterprise Voice Implementations,Components of enterprise voice networks:企業(yè)語(yǔ)音網(wǎng)絡(luò)的組件: Gateways and gatekeepers語(yǔ)音網(wǎng)關(guān)和語(yǔ)音網(wǎng)守 Cisco Unified CallManager and IP phonesCisco 統(tǒng)一呼叫管理平臺(tái)和IP電話系統(tǒng),

2、Voice Gateway Functions on a Cisco Router,Voice Gateway Functionson a Cisco Router,Connect traditional telephony devices to VoIP連接到傳統(tǒng)的電話設(shè)備到VoIP Convert analog signals to digital format轉(zhuǎn)換模擬信號(hào)到數(shù)字信號(hào)格式 Encapsulate voice into IP packets將語(yǔ)音封裝到IP數(shù)據(jù)包,Perform voice compression執(zhí)行語(yǔ)音壓縮 Provide DSP resources for

3、 conferencing and transcoding使用DSP為會(huì)議和譯碼 Support fallback scenarios for IP phones (Cisco SRST)能夠支持可存活遠(yuǎn)程電話（SRST）的特性 Act as a call agent for IP phones (Cisco Unified CallManager Express)為IP電話充當(dāng)呼叫代理 Provide DTMF relay and fax and modem support提供DTMF中繼和傳真與modem的支持,Cisco Unified CallManager Functions,Cis

4、co Unified CallManager Functions,Call processing 呼叫處理 Dial plan administration 撥號(hào)計(jì)劃管理 Signaling and device control 信令和設(shè)備控制 Phone feature administration 電話機(jī)功能管理 Directory and XML services 目錄和XML的服務(wù) Programming interface to external applications 為外部應(yīng)用提供編程接口,Example: Signaling and Call Processing,Enter

5、prise IP Telephony Deployment Models,Enterprise IP TelephonyDeployment Models,Example: Single Site,Cisco Unified CallManager servers, applications, and DSP resources are located at the same physical location.CCM服務(wù)器和DSP資料位于相同的物理站點(diǎn). IP WAN is not used for voice.IP WAN不用于IP電話服務(wù). PSTN is used for all ex

6、ternal calls.PSTN用于所有外部呼叫. Note: Cisco Unified CallManager cluster can be connected to various places depending on the topology.,Example: Multisite withCentralized Call Processing,Cisco Unified CallManager servers and applications are located at the central site, while DSP resources are distributed.

7、CCM服務(wù)器和應(yīng)用服務(wù)器位于中心站點(diǎn),DSP的資源是分布于各個(gè)站點(diǎn)中. IP WAN carries data and voice (signaling for all calls, media only for intersite calls).IP WAN承載數(shù)據(jù)和語(yǔ)音(呼叫信令) PSTN access is provided at all sites.所有站點(diǎn)都有PSTN的接入鏈路 CAC is used to limit the number of VoIP calls, and AAR is used if WAN bandwidth is exceeded.CAC用于限制VoIP

8、的呼叫數(shù)量,如果超出WAN帶寬哪么AAR(備用自動(dòng)路由選擇)則被應(yīng)用. Cisco SRST is located at the remote branch.遠(yuǎn)程分部門(mén)均啟用了SRST Note: Cisco Unified CallManager cluster can be connected to various places depending on the topology.,Example: Multisite with Distributed Call Processing,Cisco Unified CallManager servers, applications, and

9、DSP resources are located at each site.CCM服務(wù)器和應(yīng)用程序服務(wù)器以及DSP資源位于每個(gè)站點(diǎn). IP WAN carries data and voice for intersite calls only (signaling and media).IP WAN負(fù)責(zé)承載站點(diǎn)間的數(shù)據(jù)和語(yǔ)音(呼叫信令). PSTN access is provided at all sites; rerouting to PSTN is configured if IP WAN is down.所有站點(diǎn)都擁有PSTN接入;如果IP WAN出錯(cuò)哪么將被重路由到PSTN的網(wǎng)絡(luò).

10、 CAC is used to limit the number of VoIP calls, and AAR is used if WAN bandwidth is exceeded.CAC用于限制VoIP的呼叫數(shù)量,如果超出WAN帶寬哪么AAR(備用自動(dòng)路由選擇)則被應(yīng)用. Note: Cisco Unified CallManager cluster can be connected to various places, depending on the topology.,Example: Clustering over WAN,Cisco Unified CallManager se

11、rvers of a single cluster are distributed among multiple sites, while applications and DSP resources are located at each site.單個(gè)CCM服務(wù)器集群,應(yīng)用程序服務(wù)器，DSP資源分布于不同的站點(diǎn) Intracluster communication (such as, database synchronization) is performed over the WAN.集群間的通信(比如數(shù)據(jù)同步)通過(guò)WAN完成. IP WAN carries data and voice

12、 for intersite calls only (signaling and media).所有站點(diǎn)都擁有PSTN接入;如果IP WAN出錯(cuò)哪么將被重路由到PSTN的網(wǎng)絡(luò). PSTN access is provided at all sites; rerouting to PSTN is performed if IP WAN is down.所有站點(diǎn)都擁有PSTN接入;如果IP WAN出錯(cuò)哪么將被重路由到PSTN的網(wǎng)絡(luò). CAC is used to limit the number of VoIP calls; AAR is used if WAN bandwidth is exce

13、eded.CAC用于限制VoIP的呼叫數(shù)量,如果超出WAN帶寬哪么AAR(備用自動(dòng)路由選擇)則被應(yīng)用. Note: Cisco Unified CallManager cluster can be connected to various places, depending on the topology.,Identifying Voice Commands in IOS Configurations,Identifying Voice Commands inBasic Cisco IOS VoIP Configurations,What is CAC?,What Is CAC?,CAC a

14、rtificially limits the number of concurrent voice calls.CAC(呼叫接納控制)機(jī)制可以限制并發(fā)呼叫數(shù). CAC prevents oversubscription of WAN resources caused by too much voice traffic.CAC避免WAN鏈路帶寬被VoIP呼叫過(guò)度占用. CAC is needed because QoS cannot solve the problem of voice call oversubscription:因?yàn)镼oS不能解決呼叫過(guò)度問(wèn)題因此需要CAC來(lái)解決，其是QoS配置

15、的補(bǔ)充: QoS gives priority only to certain packet types (RTP versus data).QoS 機(jī)制只能為VoIP(RTP)提供優(yōu)先服務(wù),通過(guò)對(duì)數(shù)據(jù)實(shí)施優(yōu)先級(jí)別. QoS cannot block the setup of too many voice calls.QoS 不能夠阻止并發(fā)語(yǔ)音呼叫數(shù)量 Too much voice traffic results in delayed voice packets.較多的語(yǔ)音流量會(huì)導(dǎo)致語(yǔ)音包的延遲.,Example: CAC Deployment,IP network (WAN) is only

16、 designed for two concurrent voice calls.本例中的IP網(wǎng)絡(luò)僅僅設(shè)計(jì)用于兩個(gè)并發(fā)的語(yǔ)音呼叫. If CAC is not deployed, a third call can be set up, causing poor quality for all calls.如果CAC沒(méi)有被部署,那么第三個(gè)呼叫將被安裝,將會(huì)導(dǎo)致所有呼叫的通話質(zhì)量下降. After CAC is deployed, the third call is blocked.如果CAC被部署,則第三個(gè)呼叫將會(huì)被禁止.,Summary,Converged enterprise network

17、s include components supporting VoIP, such as gateways, gatekeepers, Cisco Unified CallManager, and IP phones. Cisco ISRs provide voice capabilities, including gateway, call agent, and DSP functions. Cisco Unified CallManager provides call processing and signaling services and provides access to applications from IP phones.