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IP Telephony Using CallManager Express Lab Portfolio by Ernie Friend, Cheryl A. Schmidt

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Chapter 6.Digit Manipulation

Depending on the design of the voice network, you might need to manipulate the digits at different points throughout the voice network. Digits can be added, removed, or changed, depending on the dial plan. Several digit manipulation options are available, depending on the situation. This chapter discusses some common digit manipulation strategies:

• Digit stripping and prefixes

• Forward digits

• Number expansion

• Translation rules for VoIP

Digit Stripping and Prefixes

When a router matches a phone number (dial string) to an outbound plain old telephone service (POTS) dial peer, the default behavior strips the left-justified digits that explicitly match the destination pattern. ...

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