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Goals of Interoperability

Chapter 2, "Building a Cisco IPC Express Network," covers the choice between centralized architectures (those based solely on Cisco CallManager) and distributed or autonomous site architectures (those based on Cisco CME) for implementing VoIP networks. In many real-world cases, this isn't a simple either/or decision, because many networks include both types of structures, discussed in Chapter 2 as the hybrid network architecture.

Real enterprise VoIP networks that have been designed consistently from the ground up and that adhere to a single uniform architectural approach are rare. The technologies available to network designers have evolved rapidly over the past decade or two. This rapid evolution is likely to continue for some time. It requires organizations to continually rethink their network architectures to take advantage of the latest available enhancements. Not only do the technologies change, but so do the companies trying to make best use of them. Companies split and merge and reinvent themselves in a continuous effort to stay profitable and competitive. This leads to real-world networks made up of a mixture of architectures formed by the ad hoc fusion of components contributed by multiple network designs.

Looking at VoIP networks that incorporate Cisco components, you commonly see both central-site Cisco CallManager networks using Survivable Remote Site Telephony (SRST) at some remote branch offices coupled with Cisco CME systems used at other remote offices. Being able to interconnect these systems is a fairly important consideration. In fact, some businesses deliberately design their networks using both central and distributed models to take into account issues with geographic variation in the availability of WAN services. For example, in the banking industry, central Cisco CallManager designs have been widely used in city branches located in metropolitan areas where adequate bandwidth and quality of service (QoS)-enabled WAN links are fairly readily available. On the other hand, Cisco CME systems have been used in small-town bank branches located in more rural areas where WAN services might be less sophisticated and unable to support voice.

Both Cisco CallManager and Cisco CME support H.323, which you can use to create Cisco CallManager-to-CME links. Cisco CME also supports SIP for VoIP interconnect. SIP is also being introduced as a WAN trunking interface on Cisco CallManager. This chapter focuses only on the H.323 interconnect option, because the SIP interconnect option is still a work in progress as SIP support on successive Cisco CallManager releases evolves. However, you can expect that most of the architectural issues raised in this chapter are also applicable in the SIP context.

The descriptions contained in this chapter apply to the Cisco CME 3.1 and 3.2 releases and the Cisco CallManager 3.3(3) and 4.0 releases. Newer releases may have different behaviors and options than those described here.

Basic Calls Between Cisco CallManager and Cisco CME

Part I: Cisco IP Communications Express Overview

Introducing Cisco IPC Express

Building a Cisco IPC Express Network

Cisco IPC Express Architecture Overview

Part II: Feature Operation and Applications

Cisco IP Phone Options

Cisco CME Call Processing Features

Cisco CME PSTN Connectivity Options

Connecting Multiple Cisco CMEs with VoIP

Integrating Cisco CME with Cisco CallManager

Cisco IPC Express Automated Attendant Options

Cisco IPC Express Integrated Voice Mail

Cisco CME External Voice Mail Options

Additional External Applications with Cisco CME

Part III: Administration and Management

Cisco IPC Express General Administration and Initial System Setup

Configuring and Managing Cisco IPC Express Systems

Cisco IPC Express System Configuration Example

Part IV: Maintenance and Troubleshooting

Troubleshooting Basic Cisco IPC Express Features

Troubleshooting Advanced Cisco CME Features

Troubleshooting Cisco CME Network Integration

Troubleshooting Cisco UE System Features

Troubleshooting Cisco UE Automated Attendant

Troubleshooting Cisco UE Integrated Voice Mail Features

Part V: Appendixes

Appendix A. Cisco IPC Express Features, Releases, and Ordering Information

Appendix B. Sample Cisco UE AA Scripts

Appendix C. Cisco Unity Express Database Schema

Index

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Cisco IP Communications Express(c) CallManager Express with Cisco Unity Express
Cisco IP Communications Express: CallManager Express with Cisco Unity Express
ISBN: 158705180X
EAN: 2147483647
Year: 2006
Pages: 236
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