Looks like a buffer overflow somewhere.
Can you recompile with memory debugging on?
Details at:
*
http://www.kamailio.org/wiki/tutorials/troubleshooting/memory#memory_manage…
Set also mem_safety=0 in kamailio.cfg. Try to reproduce and look at the log messages to
see if there are critical operations reported there.
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https://github.com/kamailio/kamailio/issues/212#issuecomment-112585079