Cisco Unified CallManager System Guide, Release 4.2(1) - Cisco IP Telephony Overview [Cisco Unified Communications Manager (CallManager)]

Table Of Contents

Cisco IP Telephony Overview

Internet Ecosystem

Cisco IP Telephony Support

Applications

Call Processing

Infrastructure

Clients

Cisco IP Telephony Network

Where to Find More Information

Cisco IP Telephony Overview

Multiple communication networks exist as entirely separate entities, each serving a specific application. The traditional public switched telephone network (PSTN) time-division multiplexing (TDM) network serves the voice application; the Internet and intranets serve data communications.

Business requirements often force these networks to interoperate. As a result, deploying multiservice (data, voice, and video) applications such as unified messaging or web-based customer contact centers requires expensive and complex links between proprietary systems, such as private branch exchanges (PBXs) and standards-based data networks.

The traditional enterprise communication takes place on two separate networks:

•Voice

•Data

Internet Ecosystem

Over time, the Internet (and data networking technology in general) encompassed the traditional traffic types. This convergence recently started to absorb voice and video as applications into the data network. Several large Post, Telephone, and Telegraph (PTT) carriers use packet switching or voice over ATM as their backbone technology, and enterprise customers accept virtual trunking, or connecting their disparate PBXs via their wide-area data network, to avoid long-distance charges.

By converging these previously disparate networks into a single, unified network, you can begin to realize savings in multiple areas, including lower total cost of ownership, toll savings, and increased productivity.

Cisco CallManager and Cisco IP Phones provide an IP telephony solution that operates on an IP infrastructure. The clustering architecture of Cisco CallManagers allows you to scale to a highly available voice-over-IP (VoIP) network.

Cisco IP Telephony Support

Cisco IP telephony support encompasses the following components:

•Converged client devices

•Hardware/software

•Directory services

•Call processing

•Telephony/data applications

•Network management

•Service and support

Cisco IP telephony solutions enable you to

•Deploy IP-enabled business applications

•Implement a standards-based open architecture

•Migrate to a converged network in your own time frame

Cisco telephony support enables you to move from maintaining a separate data network and a closed, proprietary voice PBX system to maintaining one open and standards-based, converged network for all your data, voice, and video needs.

Applications

The following list includes the major Cisco IP Telephony voice and video applications:

•Cisco CallManager—This software-only call-processing application distributes calls, features, phones, regions, and groups over an IP network.

•Cisco Unity—The Cisco Unity messaging application provides voice messaging to enterprise communications.

•Video—IP-TV and IP-video conferencing products enable distance learning and workgroup collaboration.

•Cisco IP IVR—As an IP-powered interactive voice response (IVR) solution, Cisco IP IVR, combined with Cisco IP AutoAttendant, provides an open and feature-rich foundation for delivering IVR solutions over an IP network.

•Cisco CallManager Attendant Console—This flexible and scalable application replaces the traditional PBX manual attendant console.

•Cisco IP SoftPhone—The Cisco IP SoftPhone, a software, computer-based phone, provides communication capabilities that increase efficiency and promote collaboration.

•Cisco Personal Assistant—Cisco Personal Assistant selectively handles calls and helps you make outgoing calls. Cisco Personal Assistant provides rule-based call routing, speech-enabled directory dialing, voice message browsing, and simple ad hoc conferencing.

Call Processing

Cisco CallManager, a software-only call-processing application, distributes calls and features and clusters phones, regions, and groups over an IP network, which allows scalability to 30,000 users and triple call-processing redundancy.

Cisco CallManager provides signaling and call-control services to Cisco-integrated applications, as well as to third-party applications.

Infrastructure

The following list shows the components of the infrastructure layer of Cisco IP telephony:

•Media convergence servers

•General voice products for Cisco IP Telephony Solutions

•Switches

•Integrated IP telephony solution

•Voice trunks

•Voice gateways

•Toll bypass products

•IP protocols such as MGCP, H.323, and SIP

Clients

Cisco delivers the following IP-enabled communication devices:

•Cisco IP Phone 7970

•Cisco IP Phone 7960

•Cisco IP Phone 7940

•Cisco IP Phone 7912

•Cisco IP Phone 7910

•Cisco IP Phone 7905

•Cisco IP Phone 7902

•Cisco IP Conference Station 7936

•Cisco IP Conference Station 7935

•Cisco IP SoftPhone

•Cisco IP Phone Expansion Module 7914

Cisco IP Telephony Network

The Cisco IP Telephony network includes the following components:

•Cisco CallManager

•Cisco IP Phones

•IOS platforms

•Digital gateways

•Analog gateways

•Transcoders

•Conferencing (hardware/software)

•Media Termination Point (MTP)

•Music On Hold (MOH)

•Annunciator

•Inline power modules (10/100 Ethernet switching modules)

•Cisco IP SoftPhone

Control from the Cisco IP Phone to Cisco CallManager uses skinny client control protocol and, independently, desktop computer to Cisco CallManager, as an H.323 gatekeeper that is using H.225/H.245 over transmission control protocol (TCP).

Where to Find More Information

Related Topics

•Introduction

•System Configuration Overview, page 3-1

•Device Support, page 10-1

•Understanding Cisco CallManager Voice Gateways, page 36-1

•Transcoders, page 22-1

•Conference Bridges, page 21-1

Additional Cisco Documentation

•Cisco CallManager Configuration, Cisco CallManager Administration Guide

•Device Defaults Configuration, Cisco CallManager Administration Guide

•Cisco IP Phone Configuration, Cisco CallManager Administration Guide

•Gateway Configuration, Cisco CallManager Administration Guide

•Transcoder Configuration, Cisco CallManager Administration Guide

•Conference Bridge Configuration, Cisco CallManager Administration Guide

•Cisco CallManager Features and Services Guide

•Cisco IP Telephony Solution Reference Network Design Guide

•Cisco IP Phone user and administration documentation

•Gateway documentation

	Cisco Unified CallManager System Guide, Release 4.2(1)
	Cisco IP Telephony Overview
Cisco Unified CallManager System Guide, Release 4.2(1) Index Preface Introduction Cisco IP Telephony Overview System Configuration Overview Multilevel Administration System-Level Configuration Settings Clustering Redundancy Call Admission Control Cisco TFTP Device Support Services Auto-Registration Partitions and Calling Search Spaces Time-of-Day Routing Understanding Route Plans Application Dial Rules Overview Understanding the Directory Managing User Directory Information Media Resource Management Annunciator Conference Bridges Transcoders Music On Hold Media Termination Points Cisco DSP Resources for Transcoding, Conferencing, and MTP Voice Mail Connectivity to Cisco CallManager SMDI Voice Mail Integration Cisco Unity Messaging Integration Cisco DPA Integration Call Park and Directed Call Park Call Pickup Cisco IP Phone Services Cisco CallManager Extension Mobility and Phone Login Features Cisco CallManager Attendant Console Cisco IP Manager Assistant Understanding Cisco CallManager Voice Gateways Understanding IP Telephony Protocols Understanding Session Initiation Protocol (SIP) Understanding Cisco CallManager Trunk Types Cisco IP Phones Understanding Video Telephony Computer Telephony Integration (Revised 01/08/2007) Cisco ATA 186 and Cisco ATA 188 Administrative Tools Overview Administrative Accounts and Passwords	Download this chapter Cisco IP Telephony Overview Download the complete book Cisco CallManager System Guide Book Length PDF (PDF - 4 MB) Feedback Table Of Contents Cisco IP Telephony Overview Internet Ecosystem Cisco IP Telephony Support Applications Call Processing Infrastructure Clients Cisco IP Telephony Network Where to Find More Information Cisco IP Telephony Overview Multiple communication networks exist as entirely separate entities, each serving a specific application. The traditional public switched telephone network (PSTN) time-division multiplexing (TDM) network serves the voice application; the Internet and intranets serve data communications. Business requirements often force these networks to interoperate. As a result, deploying multiservice (data, voice, and video) applications such as unified messaging or web-based customer contact centers requires expensive and complex links between proprietary systems, such as private branch exchanges (PBXs) and standards-based data networks. The traditional enterprise communication takes place on two separate networks: •Voice •Data Internet Ecosystem Over time, the Internet (and data networking technology in general) encompassed the traditional traffic types. This convergence recently started to absorb voice and video as applications into the data network. Several large Post, Telephone, and Telegraph (PTT) carriers use packet switching or voice over ATM as their backbone technology, and enterprise customers accept virtual trunking, or connecting their disparate PBXs via their wide-area data network, to avoid long-distance charges. By converging these previously disparate networks into a single, unified network, you can begin to realize savings in multiple areas, including lower total cost of ownership, toll savings, and increased productivity. Cisco CallManager and Cisco IP Phones provide an IP telephony solution that operates on an IP infrastructure. The clustering architecture of Cisco CallManagers allows you to scale to a highly available voice-over-IP (VoIP) network. Cisco IP Telephony Support Cisco IP telephony support encompasses the following components: •Converged client devices •Hardware/software •Directory services •Call processing •Telephony/data applications •Network management •Service and support Cisco IP telephony solutions enable you to •Deploy IP-enabled business applications •Implement a standards-based open architecture •Migrate to a converged network in your own time frame Cisco telephony support enables you to move from maintaining a separate data network and a closed, proprietary voice PBX system to maintaining one open and standards-based, converged network for all your data, voice, and video needs. Applications The following list includes the major Cisco IP Telephony voice and video applications: •Cisco CallManager—This software-only call-processing application distributes calls, features, phones, regions, and groups over an IP network. •Cisco Unity—The Cisco Unity messaging application provides voice messaging to enterprise communications. •Video—IP-TV and IP-video conferencing products enable distance learning and workgroup collaboration. •Cisco IP IVR—As an IP-powered interactive voice response (IVR) solution, Cisco IP IVR, combined with Cisco IP AutoAttendant, provides an open and feature-rich foundation for delivering IVR solutions over an IP network. •Cisco CallManager Attendant Console—This flexible and scalable application replaces the traditional PBX manual attendant console. •Cisco IP SoftPhone—The Cisco IP SoftPhone, a software, computer-based phone, provides communication capabilities that increase efficiency and promote collaboration. •Cisco Personal Assistant—Cisco Personal Assistant selectively handles calls and helps you make outgoing calls. Cisco Personal Assistant provides rule-based call routing, speech-enabled directory dialing, voice message browsing, and simple ad hoc conferencing. Call Processing Cisco CallManager, a software-only call-processing application, distributes calls and features and clusters phones, regions, and groups over an IP network, which allows scalability to 30,000 users and triple call-processing redundancy. Cisco CallManager provides signaling and call-control services to Cisco-integrated applications, as well as to third-party applications. Infrastructure The following list shows the components of the infrastructure layer of Cisco IP telephony: •Media convergence servers •General voice products for Cisco IP Telephony Solutions •Switches •Integrated IP telephony solution •Voice trunks •Voice gateways •Toll bypass products •IP protocols such as MGCP, H.323, and SIP Clients Cisco delivers the following IP-enabled communication devices: •Cisco IP Phone 7970 •Cisco IP Phone 7960 •Cisco IP Phone 7940 •Cisco IP Phone 7912 •Cisco IP Phone 7910 •Cisco IP Phone 7905 •Cisco IP Phone 7902 •Cisco IP Conference Station 7936 •Cisco IP Conference Station 7935 •Cisco IP SoftPhone •Cisco IP Phone Expansion Module 7914 Cisco IP Telephony Network The Cisco IP Telephony network includes the following components: •Cisco CallManager •Cisco IP Phones •IOS platforms •Digital gateways •Analog gateways •Transcoders •Conferencing (hardware/software) •Media Termination Point (MTP) •Music On Hold (MOH) •Annunciator •Inline power modules (10/100 Ethernet switching modules) •Cisco IP SoftPhone Control from the Cisco IP Phone to Cisco CallManager uses skinny client control protocol and, independently, desktop computer to Cisco CallManager, as an H.323 gatekeeper that is using H.225/H.245 over transmission control protocol (TCP). Where to Find More Information Related Topics •Introduction •System Configuration Overview, page 3-1 •Device Support, page 10-1 •Understanding Cisco CallManager Voice Gateways, page 36-1 •Transcoders, page 22-1 •Conference Bridges, page 21-1 Additional Cisco Documentation •Cisco CallManager Configuration, Cisco CallManager Administration Guide •Device Defaults Configuration, Cisco CallManager Administration Guide •Cisco IP Phone Configuration, Cisco CallManager Administration Guide •Gateway Configuration, Cisco CallManager Administration Guide •Transcoder Configuration, Cisco CallManager Administration Guide •Conference Bridge Configuration, Cisco CallManager Administration Guide •Cisco CallManager Features and Services Guide •Cisco IP Telephony Solution Reference Network Design Guide •Cisco IP Phone user and administration documentation •Gateway documentation
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