Digit Manipulation

You might encounter situations where you need to control the actual digits contained in the telephone numbers that enter or leave the gateway. You might need to add the area code to a call that is routed out of the public switched telephone network (PSTN), or remove a site code from an intracompany call, for instance. Digit manipulation encompasses adding, subtracting, and changing telephone numbers. You can manipulate calling numbers, called numbers, and redirecting numbers, in addition to the numbering plan and ISDN number type. You can use techniques that are applied to incoming or outgoing calls, or globally to all calls. You can manipulate telephone numbers before a dial peer is matched, or afterward.

In this chapter, you will learn

  • Ways that a router applies digit manipulation
  • Basic digit manipulation techniques, such as digit stripping, prefixing, and forwarding
  • Number expansion
  • Number translation
  • Control of the calling line identification (CLID) number
  • Ways to troubleshoot and verify the telephone number changes that are applied

Part I: Voice Gateways and Gatekeepers

Gateways and Gatekeepers

Part II: Gateways

Media Gateway Control Protocol


Session Initiation Protocol

Circuit Options

Connecting to the PSTN

Connecting to PBXs

Connecting to an IP WAN

Dial Plans

Digit Manipulation

Influencing Path Selection

Configuring Class of Restrictions

SRST and MGCP Gateway Fallback

DSP Resources

Using Tcl Scripts and VoiceXML

Part III: Gatekeepers

Deploying Gatekeepers

Gatekeeper Configuration

Part IV: IP-to-IP Gateways

Cisco Multiservice IP-to-IP Gateway

Appendix A. Answers to Chapter-Ending Review Questions


Cisco Voice Gateways and Gatekeepers
Cisco Voice Gateways and Gatekeepers
ISBN: 158705258X
EAN: 2147483647
Year: 2004
Pages: 218

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