可生存的远程网站电话

在此博客中，我们将更详细地讨论SRST。必须使用MGCP回退的远程站点MGCP网关进行配置，以便在MGCP呼叫代理（CUCM）无法访问时从PSTN路由呼叫。此博客将介绍在SRST模式下在远程站点网关上配置TDM呼叫路由的选项。MGCP Exceprack将允许在任何MGCP控制端点（TDM语音端口）上的入站呼叫路由。MGCP Bexckback并不隐含地知道内部拨号计划，并在执行数字转换时没有默认尝试。如果PSTN Provider使用10位数DNS路由入站呼叫，内部拨号计划为5位数，则所有入站呼叫都会失败。以下命令语法将在212区号中映射10位拨号，并以1：路由器（CONFIG）＃呼叫管理器 - 返回路由器（Config-CM-Bregrack）＃Dialplan-Text1 212551 ....扩展长度5多个Dialplan-Templation命令可用于具有不同DID范围的站点。Dialplan-Pattern命令将转换思科IP电话的来电，但不是连接到外汇站（FXS）端口的模拟设备。翻译配置文件可用于匹配从发往FXS端口的ISDN接口的入站呼叫匹配。 Since FXO ports do not support DID, FXO ports will need the command “connection plar opx [extension]” to redirect inbound calls to analog FXO ports to devices. Translation profiles have been covered in previous blogs. The gateway will also need a configuration to route outbound calls to the PSTN during an SRST event. There are two ways to achieve outbound call routing: 1) An entire H.323 dial plan could be provisioned for SRST events. H.323 dial plans allow class of restrictions lists which will be covered in a future blog. H.323 gateways have been covered in previous blogs. 2) An access-code can be configured in SRST configuration mode. When the access code is dialed, the SRST gateway would redirect the call to an outbound TDM interface and the calling party would then hear a stutter (secondary) dial tone. At this time, the calling party would be able to dial any pattern the PSTN provider is capable of routing. The configuration appears below: Router(config-cm-fallback)#access-code pri 9 direct-inward-dial There is plenty more SRST configuration to talk about. We’ll continue the SRST conversation in the next blog.