i managed to get pjsua dump core when it crashes after initial registration. i don't have debug symbols and gdb tells only this: Program terminated with signal 11, Segmentation fault. #0 0x00000000004f0ce8 in Copy_16_To_16 () (gdb) where #0 0x00000000004f0ce8 in Copy_16_To_16 () #1 0x00000000004f2867 in AdaptingProcess () #2 0x00000000004eac5e in CallbackThreadFunc () #3 0x00007f639488db50 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0 #4 0x00007f6393ca0a7d in clone () from /lib/x86_64-linux-gnu/libc.so.6 #5 0x0000000000000000 in ?? () does that tell anything to anyone? -- juha