See timo's post for the relevant wiki pages. They describe what each state
file does, which alsa channels change important volume settings in them, and
which package contains them so that you can reinstall the package to get back
to defaults.
When you start or end a call the dialler app will switch state files. At rest
you will probably be using stereoout.state so that when the phone rings the
sound will go to the speaker. When you answer the call it will switch to
gsmhandset.state, or perhaps gsmheadset.state if you have the headset plugged
in. pymixer will reflect the changes in the settings made by loading a new
state file.
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