集中式呼叫处理——自动备用路由

CUCM位置呼叫允许控制(CAC)机制不是默认打开。CAC应该符合优先队列在广域网(PQ)配置。将PQ QoS配置与CAC机制将保证通话质量/ IP广域网。断断续续的通话质量问题会导致如果CAC和QoS不正确配置。电话管理器使用24 kbps带宽变量,分别G.729和G.711 80 kbps。CAC独自将拒绝调用在WAN上时没有足够的带宽。最终用户会听到重新排序的语气(或一个信号器消息),看到“没有足够的带宽”显示在手机的液晶的IP广域网拒绝。自动备用路由(AAR)是一个CUCM特性,将透明地对光拒绝在IP广域网集中式呼叫处理模型。主叫用户的手机会显示“网络拥塞。重路由”液晶当呼叫路由。 Automated Alternate Routing depends on the external phone number mask of each destination directory number. AAR works in environments with direct inward dialing (DID), but CUCM 4.2/6.0 introduced the call forward no bandwidth (CFNB) feature which will allow directory numbers to be configured with an AAR destination mask that will forward CAC rejected calls to an operator, automated server (AA)/ IVR), cell phone, or voice mail. AAR is not turned on by default. AAR must be activated in the Call Manager service parameters. Set the Automated Alternate Routing Enable from False to True. The Out of Bandwidth Text and AAR Network Congestion Rerouting Text service parameters can be changed to propagate LCD messages different than the two described in the previous paragraph. AAR groups are used to configure a dial prefix which will be pre-pended to the dialed digits after the dialed digits are manipulated by the destination directory phone number mask. AAR groups are normally configured as 91 in environments where a 9 access code is used for an outgoing line and a 1 is required by the long distance provider. External phone number masks are normally configured to change the corporate abbreviated dial plan to a fully qualified 10 digit PSTN number. A five digit phone number of 11001 with an external phone number mask of 21255XXXXX would result in a phone number of 2125511001. The external phone number mask parameter of the called party is used to manipulate the dialed digits and the AAR group is used to prefix the access codes and the long distance code if necessary. AAR groups are configured from the call routing menu. AAR groups are applied on the phone configuration page. The calling search space (CSS) of the calling party may not include long distance dialing capabilities. AAR calls that require long distance dialing would fail in this situation if a separate AAR calling search space is not configured at the phone. The AAR calling search space (CSS) will override the device or Line/Device CSS. In the next blog, we will start talking about the distributed multi-cluster call processing model. REFERENCES: CUCM 7.x Solution Reference Network Design (SRND) Guide: http://www.cisco.com/en/US/netsol/ns818/networking_solutions_program_home.html www.cisco.com/go/srnd