2.2. How Does Call Analysis Work?

Call Analysis uses the following techniques to determine the progress of the call:

• Cadence Detection
• Frequency Detection
• Loop Current Detection
• Positive Voice Detection and Positive Answering Machine Detection

The following figures illustrate these processes.

Figure 1. Basic Call Analysis Components

Figure 2. PerfectCall Call Analysis Components

Frequency Detection, Cadence Detection, Loop Current Detection, Positive Voice Detection, and Positive Answering Machine Detection can all operate simultaneously during Call Analysis. See Section 2.6. How the DX_CAP Controls Call Analysis for more information.

The figures show that Cadence Detection is the sole means of detecting a no ringback, busy, or no answer when using Basic Call Analysis. PerfectCall Call Analysis uses Cadence Detection plus Frequency Detection to identify all of these signals plus fax machine tones. A connect can be detected through the complementary methods of Cadence Detection, Frequency Detection, Loop Current Detection, Positive Voice Detection, and Positive Answering Machine Detection (Positive Answering Machine Detection is available with PerfectCall Call Analysis only).

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