One template exists for each tone. In these tables, the tone template names are in the leftmost column (Tone Name), and the system parameter names are across the column headings. The Tone Name is used only in these tables.
Each tone can have up to three frequency components, with accompanying levels and times on and off. Values for each of these are listed one above another. The column headed n indicates the frequency component (1, 2, or 3).
The columns headed Nom show the nominal values that are specified for the tone by the relevant authority or switch manufacturer. The nominal values are shown for information only. The templates contain only the extremes (Min and Max) of the range that defines the tone.
The column headed Tone Type corresponds to the value that is stored in the System : Progress tone type system variable (SV175). The values returned and the equivalent tone types are as follows:
The identifier that is stored in the System : Progress tone ID system variable (SV176) is not shown in these tables, but it is shown in the Call Progress Tones window (see Displaying call progress tone values).