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CCNA Voice Lab Manual by Brent Sieling

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Appendix E. PSTN Simulator

The PSTN Simulator is a Cisco router with one or more T1/E1/PRI interfaces (and enough digital signal processor [DSP] resources to run the interfaces), configured to respond to incoming calls and to forward calls for other pods to the correct interface. The PSTN Simulator plays a unique audio file when any of the categories of phone numbers shown in Table E-1 are sent to the Simulator.

Table E-1. Audio Response Phone Number Categories

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The audio response is achieved by using the Tool Command Language (Tcl) scripts1 paired with an audio file encoded as .au or .wav for each call category. To create the audio file, the same ...

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