Implementing Voice Support in an Enterprise Network.ppt

1、Describe Cisco VoIP Implementations,Implementing Voice Support in an Enterprise Network,Enterprise Voice Implementations,Enterprise Voice Implementations,Components of enterprise voice networks:企业语音网络的组件: Gateways and gatekeepers语音网关和语音网守 Cisco Unified CallManager and IP phonesCisco 统一呼叫管理平台和IP电话系统,

2、Voice Gateway Functions on a Cisco Router,Voice Gateway Functionson a Cisco Router,Connect traditional telephony devices to VoIP连接到传统的电话设备到VoIP Convert analog signals to digital format转换模拟信号到数字信号格式 Encapsulate voice into IP packets将语音封装到IP数据包,Perform voice compression执行语音压缩 Provide DSP resources for

3、 conferencing and transcoding使用DSP为会议和译码 Support fallback scenarios for IP phones (Cisco SRST)能够支持可存活远程电话（SRST）的特性 Act as a call agent for IP phones (Cisco Unified CallManager Express)为IP电话充当呼叫代理 Provide DTMF relay and fax and modem support提供DTMF中继和传真与modem的支持,Cisco Unified CallManager Functions,Cis

4、co Unified CallManager Functions,Call processing 呼叫处理 Dial plan administration 拨号计划管理 Signaling and device control 信令和设备控制 Phone feature administration 电话机功能管理 Directory and XML services 目录和XML的服务 Programming interface to external applications 为外部应用提供编程接口,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服务器和DSP资料位于相同的物理站点. IP WAN is not used for voice.IP WAN不用于IP电话服务. 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服务器和应用服务器位于中心站点,DSP的资源是分布于各个站点中. IP WAN carries data and voice (signaling for all calls, media only for intersite calls).IP WAN承载数据和语音(呼叫信令) PSTN access is provided at all sites.所有站点都有PSTN的接入链路 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、的呼叫数量,如果超出WAN带宽哪么AAR(备用自动路由选择)则被应用. Cisco SRST is located at the remote branch.远程分部门均启用了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服务器和应用程序服务器以及DSP资源位于每个站点. IP WAN carries data and voice for intersite calls only (signaling and media).IP WAN负责承载站点间的数据和语音(呼叫信令). PSTN access is provided at all sites; rerouting to PSTN is configured if IP WAN is down.所有站点都拥有PSTN接入;如果IP WAN出错哪么将被重路由到PSTN的网络.

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的呼叫数量,如果超出WAN带宽哪么AAR(备用自动路由选择)则被应用. 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.单个CCM服务器集群,应用程序服务器，DSP资源分布于不同的站点 Intracluster communication (such as, database synchronization) is performed over the WAN.集群间的通信(比如数据同步)通过WAN完成. IP WAN carries data and voice

12、 for intersite calls only (signaling and media).所有站点都拥有PSTN接入;如果IP WAN出错哪么将被重路由到PSTN的网络. PSTN access is provided at all sites; rerouting to PSTN is performed if IP WAN is down.所有站点都拥有PSTN接入;如果IP WAN出错哪么将被重路由到PSTN的网络. 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的呼叫数量,如果超出WAN带宽哪么AAR(备用自动路由选择)则被应用. 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(呼叫接纳控制)机制可以限制并发呼叫数. CAC prevents oversubscription of WAN resources caused by too much voice traffic.CAC避免WAN链路带宽被VoIP呼叫过度占用. CAC is needed because QoS cannot solve the problem of voice call oversubscription:因为QoS不能解决呼叫过度问题因此需要CAC来解决，其是QoS配置

15、的补充: QoS gives priority only to certain packet types (RTP versus data).QoS 机制只能为VoIP(RTP)提供优先服务,通过对数据实施优先级别. QoS cannot block the setup of too many voice calls.QoS 不能够阻止并发语音呼叫数量 Too much voice traffic results in delayed voice packets.较多的语音流量会导致语音包的延迟.,Example: CAC Deployment,IP network (WAN) is only

16、 designed for two concurrent voice calls.本例中的IP网络仅仅设计用于两个并发的语音呼叫. If CAC is not deployed, a third call can be set up, causing poor quality for all calls.如果CAC没有被部署,那么第三个呼叫将被安装,将会导致所有呼叫的通话质量下降. After CAC is deployed, the third call is blocked.如果CAC被部署,则第三个呼叫将会被禁止.,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.