- instead of raw data, it would be even better to use dspilbc.
  Is there a way to store the captured data to a file, in a way it can
  be played back again (some wrapper)?

The sources of maemo-recorder finally answered that question:
the scripts below can record and play ilbc encoded files:

#!/bin/sh
gst-launch  filesrc location="$1" ! \
    audio/x-iLBC,rate=8000,channels=1,mode=20 ! \
    dspilbcsink

#!/bin/sh
gst-launch -t -m -v dspilbcsrc dtx=0 ! \
    audio/x-iLBC,rate=8000,channels=1,mode=20 ! \
    filesink location=$1


Thanks

    Reinhard

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