I've been looking into this and once it's hung, you can hook into the thread with the highest cpu usage with gdb and it appears that python-sipsimple is stuck in the alsa function `snd_pcm_drain (pcm);` ( https://github.com/AGProjects/python-sipsimple/blob/master/deps/pjsip/pjmedia/src/pjmedia-audiodev/alsa_dev.c#L619). I'm not sure if it's the right approach, but the documentation for that function says:
"For stopping the PCM stream immediately, use ::snd_pcm_drop() instead." Switching to that function fixes things for me.
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