Translation patterns: A translation pattern is like a route pattern. The following sources of call-routing requests also require a call-routing table lookup: The simplest are the IP phone, gateways, and trunks. Five different sources of call-routing requests require a call-routing table lookup. Many different settings within the Cisco Unified Communications Manager require an administrator to understand the difference between call-routing sources and call-routing targets. This destination device can be a local endpoint or another remote call control system. The type of analysis depends on the addressing method that is used by the source of the call setup request (digit-by-digit or en bloc) and the address type (number versus URI).Ĭisco Unified Communications Manager forwards the call setup request to the destination device that is associated with the matched call-routing table entry. Regardless of the call-routing type, the call-routing process itself can be summarized as follows:Ĭisco Unified Communications Manager receives a call setup request from a local endpoint or from another call control system such as a remote Cisco Unified Communications Manager cluster or a PSTN gateway.Ĭisco Unified Communications Manager analyzes the target of the received request to find the best matching entry in its call-routing table. The table consists of directory numbers of registered IP phones and of statically entered route patterns that point to external destinations. The Cisco Unified Communications Manager call-routing table is built using connected devices. PSTN destinations can include off-net intersite calls, which are effectively PSTN destinations because they are addressed by their PSTN numbers. External destinations are PSTN destinations or other VoIP domains such as an ITSP or another Cisco Unified Communications Manager cluster. For external destinations, an explicit route-called a route pattern-must be configured. The Cisco Unified Communications Manager can automatically route calls to internal destinations within the same cluster because Cisco Unified Communications Manager is configured with the directory numbers of its associated devices. PSTN routing: This type of call routing occurs between a site and the PSTN. Intersite routing: This type of call routing occurs between multiple sites.Ī translation pattern is used for both centralized and distributed call-processing deployment models.Ī route pattern is used only for a distributed call-processing deployment. Intrasite routing: This type of call routing occurs within a single site. There are three main types of call routing: Calls must be routed and interconnected according to the dialed number. An end-to-end enterprise dial plan needs to consider all of these aspects and is not limited only to establishing a route between the calling and called entities. It also involves applying modifications to the dial string and applying modifications to the calling party identification. Route selection also involves selecting alternate routes if the primary route is not available for some reason. Call routing is about selecting a route to the called destination, establishing the call, and presenting the identity of the parties involved in the expected format. This chapter will expand on these concepts as calls reach beyond the local call control system. Chapter 18 covered how to allow or block calls based on the Class of Service of the calling entity, and began identifying dialing habits based on the structure of the dial string. Routing calls involves several aspects, some of which were covered in that chapter. Chapter 18, “Cisco Unified Communications Manager Call Admission Control (CAC),” introduced the concept of call routing within the Cisco Unified Communications Manager.
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