DSP Resources
This chapter covers the use of digital signal processors (DSP) in Cisco voice gateways. Voice gateways use DSPs to terminate voice calls from time-division multiplexing (TDM) systems and convert those calls to Voice over IP (VoIP). DSPs can also provide transcoding and conference bridge resources to a Cisco CallManager.
This chapter helps you to do the following:
- Understand the capabilities of DSPs
- Determine the number of DSPs required to support your requirements
- Configure a gateway to provide conferencing resources for CallManager
- Configure a gateway to provide transcoding resources for CallManager and Cisco CallManager Express (CME)
- Understand the methods available for supporting fax and modem traffic
- Configure the gateway to support fax and modem traffic
Need for DSP Resources |
Part I: Voice Gateways and Gatekeepers
Gateways and Gatekeepers
- Gateways and Gatekeepers
- The Role of Voice Gateways
- The Role of Voice Gatekeepers
- The Role of IP-to-IP Gateways
- Introduction to Voice Protocols
- Call Control Agents
- Deployment Scenarios
- Case Study: Introduction
- Chapter Review Questions
Part II: Gateways
Media Gateway Control Protocol
- Media Gateway Control Protocol
- Introduction to MGCP
- MGCP Operation
- Call Flow with MGCP
- Dial Plan Considerations
- Implementing MGCP Gateways
- Securing MGCP Gateways
- Troubleshooting Tools
- Case Study: Configuring an MGCP Gateway
- Review Questions
H.323
- H.323
- H.323 Specifications
- H.323 Network Components
- Call Flow
- H.323 Protocol Pros and Cons
- When to Use H.323
- Dial Plan Considerations
- Implementing H.323 Gateways
- Securing H.323 Gateways
- Troubleshooting Tools
- Case Study: Configuring an H.323 Gateway
- Review Questions
Session Initiation Protocol
- Session Initiation Protocol
- Description of SIP
- SIP Call Flow
- SIP Pros and Cons
- When to Use SIP
- Dial Plan Considerations
- Implementing SIP Gateways
- Securing SIP Gateways
- Allowing H.323 to SIP Connections
- Troubleshooting Tools
- Case Study: Configuring SIP Between a Gateway and CallManager 5.x
- Review Questions
Circuit Options
Connecting to the PSTN
- Connecting to the PSTN
- PSTN Circuit Selection Overview
- Analog Trunks
- Digital Trunks
- Case Study: Add an E1 R2 Connection to the Leeds Gateway
- Review Questions
Connecting to PBXs
- Connecting to PBXs
- Analog Trunks
- Digital Trunks
- Configuring Transparent Common Channel Signaling
- Case Study: Implementing a Cisco Voice Gateway at the Shanghai Office
- Review Questions
Connecting to an IP WAN
- Connecting to an IP WAN
- Applications for Connecting to an IP WAN
- Design Considerations
- Quality of Service
- Providing Fax and Modem Services
- Security
- Case Study: Using a T1 Link as a Tie Line
- Review Questions
Dial Plans
- Dial Plans
- Numbering Plans
- Overlapping Numbering Plans
- Building a Scalable Dial Plan
- Dial Peers
- Dial Peer Matching
- Case Study: Configuring PSTN Access
- Review Questions
Digit Manipulation
- Digit Manipulation
- Basic Digit Manipulation
- Number Expansion
- Voice Translation Rules and Profiles
- Manipulating Caller ID
- Order of Operation in Digit Manipulation
- Troubleshooting Digit Manipulation
- Case Study
- Review Questions
Influencing Path Selection
- Influencing Path Selection
- Hunt Groups
- Using Trunk Groups
- Tail-End Hop-Off
- Call Admission Control
- POTS-to-POTS Call Routing Considerations
- Case Study: Implementing Gateway-Controlled RSVP
- Review Questions
Configuring Class of Restrictions
- Configuring Class of Restrictions
- COR Overview
- COR Operation
- Implementing COR
- Assigning COR Lists with SRST
- Assigning COR Lists with Cisco CallManager Express
- Restricting Inbound Calls
- Case Study: Implementing COR for Miami
- Review Questions
SRST and MGCP Gateway Fallback
- SRST and MGCP Gateway Fallback
- SRST Overview
- Configuring SRST
- Dial Plan Considerations
- SRST Features
- SIP SRST
- Call Preservation
- Secure SRST
- MGCP Gateway Fallback
- Configuring MGCP Gateway Fallback
- Verifying and Troubleshooting SRST
- Verifying and Troubleshooting MGCP Gateway Fallback
- Case Study: Integrating SRST with an Analog Voice-Mail System
- Review Questions
DSP Resources
- DSP Resources
- Need for DSP Resources
- Determining the DSP Resources Required
- Configuring DSP Resources
- Transcoding for CallManager Express
- Case Study: Add DSP Resources to the Miami Gateway
- Review Questions
Using Tcl Scripts and VoiceXML
- Using Tcl Scripts and VoiceXML
- Tcl IVR and VoiceXML Application Overview
- Sample Applications
- Downloading Tcl Scripts from Cisco.com
- Configuring the Gateway to Use a Tcl Script
- Implementing the AA Tcl Script
- Creating Audio Files
- Restrictions and Caveats
- Case Study: Implementing ACD Application
- Review Questions
Part III: Gatekeepers
Deploying Gatekeepers
- Deploying Gatekeepers
- Gatekeeper Functionality
- Gatekeeper Signaling
- E.164 Number Resolution
- Call Admission Control
- Gatekeeper Deployment Models
- Gatekeepers with CallManager
- Security with Gatekeepers
- Review Questions
Gatekeeper Configuration
- Gatekeeper Configuration
- Configuring Basic Gatekeeper Functionality
- Multiple Gatekeeper Configurations
- Configuring Directory Gatekeepers
- Troubleshooting Gatekeepers
- CallManager and Gatekeepers
- Gatekeeper Redundancy
- Configuring Resource Availability Indicator
- Configuring Gatekeeper Security
- Case Study: Deploying Gatekeepers to Assist in Migration to VoIP
- Review Questions
Part IV: IP-to-IP Gateways
Cisco Multiservice IP-to-IP Gateway
- Cisco Multiservice IP-to-IP Gateway
- IP-to-IP Gateway Overview
- Cisco Multiservice IP-to-IP Gateway
- Basic Configuration
- IP-to-IP Gateway Features
- Case Study: Providing Enterprise VoIP Trunking to VoIP Service of the Service Provider
- Review Questions
Appendix A. Answers to Chapter-Ending Review Questions
Index
Cisco Voice Gateways and Gatekeepers
ISBN: 158705258X
EAN: 2147483647
EAN: 2147483647
Year: 2004
Pages: 218
Pages: 218
