I have tested qtwengophone a lot, especially phApi. If AEC is enabled (noaec=0), after a time (no specific moment), the CPU load of the application rises to 100% and stays there until the call is ended. With aec disabled (noaec=1), this problem does not appear. So my guess is the AEC algorithm or its implementation is kind of buggy.
When this happens, the distortment of the voice is like a "microphony effect". At least it sounds like that. Maybe this is helpfull in reproducing this behavior.
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Best regards / Mit freundlichen Grüssen
Cantemir Mihu
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