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You probably have different ALSA libraries (not kernel APIs) in Debian and the Kindle environment. Also, the Debian pjsua might be patched. Does it even run PortAudio? I ask because pjsua seems to run a PortAudio driver.
The Kindle is picky about what sound formats and channel numbers it supports. Did you try to check if it uses 2 channels (pseudo stereo)? Also it might make sense to try rates like 22050 and 11025.
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