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Customizing Tones

Feature Description

See Tones in the DSP Series 2 Card Product Description chapter for more information.

Overview

Many telephone networks require call progress tones with different patterns of frequencies, at different intervals. For example, the CSP may need to provide a different cadence of the Ringback Pattern based on the called party address. To ensure network compatibility, you may need to adjust the attributes of the call progress tones.

Interval Durations

Interval durations are specified in units of 10 milliseconds. However, actual transmitted durations are truncated to 20 millisecond intervals. So an interval duration specified as a multiple of 20 milliseconds is transmitted with that duration, while other interval durations are shortened.

For example, intervals with a specified duration of 20, 40, or 60 milliseconds are transmitted with those durations. But an interval with a specified duration of 30 milliseconds is transmitted with a 20 milliseconds duration, an interval with a specified duration of 70 milliseconds is transmitted with a 60 milliseconds duration, and so on. Because durations are handled this way, your shortest interval duration should be 20 milliseconds.

Restoring Default Settings

To restore default settings for the transmit tone parameters, send the Reset Configuration (0x000B) message, or power down both Matrix Controller cards, and then power them up again.

Digital Signal Processor