思科iOS拨号器：Toll旁路和尾部End Hop Off（TEHO）

让我们调查一个场景，其中一家公司使用Cisco Unified Communications Manager Express（CUCME）路由器在加利福尼亚州，加利福尼亚州和纽约市的CUCME系统设有办事处。纽约市的路由器将配置为5号公路上的路线间电话间通话，直达IP WAN的San Jose网络。如果不可用的IP WAN，则应使用11个数字拨号拨入到直接向内拨号范围408-551-2XXX重新拨打PSTN的路由器，该拨号是从PSTN提供商购买的。以下拨号符用于配置此调用路由：拨号式语音109 VoIP Destination-Pattern 12…偏好1会话目标IPV4：10.2.1.1！Dial-Peer语音209 POTS目标patestern 12…前缀914085512偏好2端口0/0/0：23！Dial-Peer语音203 POTS destination-Pattern 91 [2-9] .. [2-9]……前缀1端口0/0/0：23从以前的博客中讨论的一些配置详细信息已从此讨论中省略如果主要的WAN路径失败，则专注于重新拨打PSTN的拨号狩猎和数字操纵。所有以数字12开头的5位数字均由较低的偏好默认情况下拨打109。如果Dial-Peer 109无法达到10.2.1.1，则Dial-Peer 209呼叫将在PRI（端口0/0/0：23）上重新连接，而无需任何最终用户干预。Dial-Peer 209将拨号数字（称为派对）操纵到带有9个访问代码的11位数字。 The new pattern matches dial-peer 203 and is routed to the PRI as an 11 digit pattern (access code is stripped). Using this configuration, calls will only be re-routed across the PRI if the destination IP address in unreachable. Call Admission Control (CAC) should be implemented using an H.323 gatekeeper to guarantee call quality. We will cover the Gatekeeper CAC configuration in a future blog. A Tail-End Hop Off (TEHO) dial-peer can be configured to enable toll cost savings for calls routed from NYC to local San Jose, California destinations on the PSTN. TEHO functionality is commonly referred to as least cost routing (LCR) which is enabled in dial-peer 401 below: Dial-peer 110 voip Destination-pattern 91408……. Prefix 91408 Session target ipv4:10.1.1.1 The CUCME device in San Jose must be configured with a dial peer similar to dial peer 203 to match on the 11 digit pattern prefixed with a 9 access code. The San Jose CUCM platform will normally route the call to the local PSTN gateway as a 7 or 10 digit local pattern (each LEC may have different regional requirements). In the next blog, we will investigate inbound and outbound call routing in sites where FXO analog ports are used to connect to the PSTN. We will then begin to explore the exciting world of translation profiles. REFERENCES Cisco IOS Dial Peer Features http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/dial_peer/dp_confg.html Global Knowledge Cisco Unified Communications classes www.globalknowledge.com/go/cisco Cisco Press Books – CVOICE / GWGK / TUC http://www.ciscopress.com/markets/detail.asp?st=44706