4.3. Programming Considerations for Accurate Global DPD

The Global DPD algorithm will accurately detect digits in the supported regions without requesting a special training digit from the caller or requiring any other restrictions on the application. However, keep the following considerations in mind when designing the application:

• Talk-off rejection (the ability of the algorithm to distinguish between dial pulses and the human voice) will improve after the first digit is detected.
• Digit detection is slightly more accurate (about 2%) after detecting a digit of '5' or greater. It is not necessary to dial a special training digit to do this. The application may simply restrict the first menu to digits 5, 6, 7, 8, 9, and 0, and the training will be complete. Subsequent menus may be unrestricted.
• In general, detection accuracy is greater for higher digits than lower. While detection accuracy is very high, it may be further improved by restricting, whenever convenient, menu selections to digits greater than '3'.

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