Number Expansion

Number expansion is another way to add digits to an outgoing called number; however, number expansion is applied to the gateway as a whole, and acts on all calls, not just those matching a designated dial peer. As with the previous three techniques, this manipulates only the called number. Number expansion manipulation occurs before any outbound dial peer is matched. Thus, you must configure outbound dial peers to match the expanded numbers, not the original ones.

The command for number expansion is num-exp original-number expanded-number, configured at global configuration mode. Although it is called number expansion, the manipulated number can contain fewer digits than the original, or it can contain more.

Example 10-2 shows two instances of number expansion configured. The first expands any four-number extension beginning with 1 to a seven-digit number beginning with 5551. The second changes any seven-digit number beginning with 5551 to a four-digit extension.

Example 10-2. Number Expansion

Miami(config)#num-exp 1... 5551...
Miami(config)#num-exp 5551... 1...
!Verifying the first number expansion
Miami#show dialplan number 1111
Macro Exp.: 5551111
!Verifying the second number expansion
Miami#show dialplan number 5551098
Macro Exp.: 1098

In the results of the show dialplan number command, notice that although the number entered in the command is the original number, the router looked for a match to the expanded number. The show dialplan number command is also useful for verifying that you have a dial peer to match the expanded number.

Voice Translation Rules and Profiles

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 © 2008-2020.
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