Вот так работают опенсорсные решения интернет-телефонии:

*** Error in `linphone': munmap_chunk(): invalid pointer: 0x00007f4047ffeb90 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7aa16)[0x7f405fcb3a16]
/usr/lib/x86_64-linux-gnu/libavutil.so.52(av_freep+0xc)[0x7f406541023c]
/usr/lib/x86_64-linux-gnu/libavcodec.so.54(avcodec_get_frame_defaults+0x13)[0x7f40659825e3]
/usr/lib/x86_64-linux-gnu/libmediastreamer_voip.so.3(+0x3b229)[0x7f4067d5c229]
/usr/lib/x86_64-linux-gnu/libmediastreamer_voip.so.3(+0x3ba83)[0x7f4067d5ca83]
/usr/lib/x86_64-linux-gnu/libmediastreamer_base.so.3(ms_filter_process+0x20)[0x7f4067b18a80]
/usr/lib/x86_64-linux-gnu/libmediastreamer_base.so.3(+0x749c)[0x7f4067b1949c]
/usr/lib/x86_64-linux-gnu/libmediastreamer_base.so.3(+0x745f)[0x7f4067b1945f]
/usr/lib/x86_64-linux-gnu/libmediastreamer_base.so.3(+0x745f)[0x7f4067b1945f]
/usr/lib/x86_64-linux-gnu/libmediastreamer_base.so.3(+0x745f)[0x7f4067b1945f]
/usr/lib/x86_64-linux-gnu/libmediastreamer_base.so.3(+0x745f)[0x7f4067b1945f]
/usr/lib/x86_64-linux-gnu/libmediastreamer_base.so.3(+0x7542)[0x7f4067b19542]
/usr/lib/x86_64-linux-gnu/libmediastreamer_base.so.3(+0x797f)[0x7f4067b1997f]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7e0e)[0x7f406343de0e]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7f405fd220fd]
======= Memory map: ========
00400000-00434000 r-xp 00000000 08:05 3983237 /usr/bin/linphone
00633000-00634000 r--p 00033000 08:05 3983237 /usr/bin/linphone
00634000-00636000 rw-p 00034000 08:05 3983237 /usr/bin/linphone
00636000-00637000 rw-p 00000000 00:00 0
00c91000-02b52000 rw-p 00000000 00:00 0 [heap]