Annunciator Resources

An annunciator uses the Cisco IP Voice Media Streaming Application service and enables Cisco CallManager to play prerecorded announcements (.wav files) and tones to Cisco IP Phones, gateways, and other configurable devices. The annunciator enables Cisco CallManager to alert callers as to why a call has failed. The annunciator can also play tones for some transferred calls and some conferences.

In conjunction with Cisco CallManager, the annunciator device provides multiple one-way, RTP stream connections to devices such as Cisco IP Phones and gateways. For example, a user at extension 1001 dials extension 2503, an invalid number. The system cannot complete the call. The annunciator device plays a one-way RTP stream to extension 1001: "Your call cannot be completed as dialed. Please consult your directory and call again or ask your operator for assistance. This is a recording."

The annunciator plays the announcement or tone to support the following conditions:

  • Announcement For devices that are configured for Cisco CallManager Multilevel Precedence Preemption (MLPP).
  • Barge tone Before a participant joins an ad hoc conference.
  • Ringback tone When you transfer a call over the PSTN through a Cisco IOS gateway, over an H.323 Intercluster Trunk, or to the SIP client from an SCCP phone, the annunciator plays the tone because the gateway cannot play the tone when the call is active.

To add an annunciator to the Cisco CallManager, you must activate the Cisco IP Voice Media Streaming Application service on the server where you want the annunciator to exist in the cluster.

Table 15-5 shows sample annunciator announcements.

Table 15-5. Sample Annunciator Announcements

Condition

Announcement

An equal- or higher-precedence call is in progress.

"Equal- or higher-precedence calls have prevented the completion of your call. Please hang up and try again. This is a recording."

A precedence access limitation exists.

"Precedence access limitation has prevented the completion of your call. Please hang up and try again. This is a recording."

A service interruption occurred.

"A service disruption has prevented the completion of your call. In case of emergency, call your operator. This is a recording."

For a single annunciator, Cisco CallManager sets the default maximum to 48 simultaneous streams, as indicated in the annunciator service parameters (accessed under the service parameters for the Voice Media Streaming Application). It is recommended that you not exceed 48 annunciator streams on a coresident server where the Cisco CallManager and Cisco IP Voice Media Streaming Application services run. If the server has only 10-Mbps connectivity, lower the setting to 24 simultaneous streams.

If the annunciator runs on a standalone server where the Cisco CallManager service does not run, the annunciator can support up to 255 simultaneous announcement streams. If the standalone server has dual CPUs and a high-performance disk system (as in the case of the 7845 MCS server), the annunciator can support up to 400 simultaneous announcement streams. You can add multiple standalone servers to support the required number of streams.

Each annunciator can support G.711 a-law, G.711 mu-law, wideband, and G.729 codec formats. A separate .wav file exists for each codec that is supported.

Annunciator Configuration

Because the annunciator service requires access to a large amount of audio files, only the Cisco CallManager can act as an annunciator in the cluster. There are no hardware-based resources that exist. When you activate the Cisco IP Voice Media Streaming Application service in Cisco CallManager Serviceability, Cisco CallManager automatically adds the annunciator device to the server configuration.

The annunciator configuration is almost identical to the MTP configuration. Minimally, you must select a host server, enter the annunciator name, and assign the annunciator to a device pool, as shown in Figure 15-3.

Figure 15-3. Annunciator Configuration Window

Each annunciator registers with only one Cisco CallManager at a time. The system might have multiple annunciators, depending on your configuration, each of which can register with different Cisco CallManager servers, depending on the device pool to which you have assigned the annunciator service. Each annunciator belongs to a device pool. The device pool associates the secondary (backup) Cisco CallManager and the region settings.

When you update or configure the annunciator service parameters, the changes automatically occur when the annunciator becomes idle, when no active announcements are played.

Transcoder Resources

Part I: Cisco CallManager Fundamentals

Introduction to Cisco Unified Communications and Cisco Unified CallManager

Cisco Unified CallManager Clustering and Deployment Options

Cisco Unified CallManager Installation and Upgrades

Part II: IPT Devices and Users

Cisco IP Phones and Other User Devices

Configuring Cisco Unified CallManager to Support IP Phones

Cisco IP Telephony Users

Cisco Bulk Administration Tool

Part III: IPT Network Integration and Route Plan

Cisco Catalyst Switches

Configuring Cisco Gateways and Trunks

Cisco Unified CallManager Route Plan Basics

Cisco Unified CallManager Advanced Route Plans

Configuring Hunt Groups and Call Coverage

Implementing Telephony Call Restrictions and Control

Implementing Multiple-Site Deployments

Part IV: VoIP Features

Media Resources

Configuring User Features, Part 1

Configuring User Features, Part 2

Configuring Cisco Unified CallManager Attendant Console

Configuring Cisco IP Manager Assistant

Part V: IPT Security

Securing the Windows Operating System

Securing Cisco Unified CallManager Administration

Preventing Toll Fraud

Hardening the IP Phone

Understanding Cryptographic Fundamentals

Understanding the Public Key Infrastructure

Understanding Cisco IP Telephony Authentication and Encryption Fundamentals

Configuring Cisco IP Telephony Authentication and Encryption

Part VI: IP Video

Introducing IP Video Telephony

Configuring Cisco VT Advantage

Part VII: IPT Management

Introducing Database Tools and Cisco Unified CallManager Serviceability

Monitoring Performance

Configuring Alarms and Traces

Configuring CAR

Using Additional Management and Monitoring Tools

Part VIII: Appendix

Appendix A. Answers to Review Questions

Index





Authorized Self-Study Guide Cisco IP Telephony (CIPT)
Cisco IP Telephony (CIPT) (Authorized Self-Study) (2nd Edition)
ISBN: 158705261X
EAN: 2147483647
Year: 2004
Pages: 329
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