The configuration also allows customised tones to be generated. You can replace these with your own versions.

The format for a tone is either a single tone or a series of duration@tone sections. In a sequence you can use duration for a period of silence. A duration is a number and then ms and a tone is a frequency or frequency+frequency for mixing two tones. Each frequency is a number of Hz and can have a volume suffix which is - and a number if dB. The tone can be followed by ^ if you want it to be shaped (rise at start and fall at end).

Whilst internally only the basic tones for silence, progress, ring, queue, hold, wait, you can configure the use of tones for various cases when no audio is present and calling a specific carrier.