After the first *make && make install*, copy mod_skypopen/configs/alsa/dummy.c to alsa-driver-1.0.20sound/drivers/dummy.c In doc its mention to do second make && make install , [!] But i dont find it in my system. [root@example /]# locate dummy.c /home/sun/Downloads/freeswitch-1.0.6/libs/tiff-3.8.2/port/dummy.c /home/sun/Downloads/freeswitch-1.0.6/libs/xmlrpc-c/src/cpp/test/testclient_dummy.cpp /home/sun/Downloads/freeswitch-1.0.6/libs/xmlrpc-c/src/test/client_dummy.c /home/sun/Downloads/freeswitch-1.0.6/src/mod/endpoints/mod_skypopen/alsa/alsa-driver-1.0.20-dummy.c /home/sun/Downloads/freeswitch-1.0.6/src/mod/endpoints/mod_skypopen/alsa/dummy.c /home/sun/Downloads/pjsip/pjproject-1.6/pjlib/src/pj/ioqueue_dummy.c /home/sun/Downloads/pjsip/pjproject-1.6/pjlib/src/pj/sock_qos_dummy.c /home/sun/Downloads/pjsip/pjproject-1.6/pjsip-apps/build/dummy.c /home/sun/Downloads/pjsip/trunk/pjlib/src/pj/ioqueue_dummy.c /home/sun/Downloads/pjsip/trunk/pjlib/src/pj/sock_qos_dummy.c /home/sun/Downloads/pjsip/trunk/pjsip-apps/build/dummy.c /opt/qtsdk-2010.04/qt/doc/src/classes/qpatternistdummy.cpp /opt/qtsdk-2010.04/qt/src/3rdparty/freetype/src/autofit/afdummy.c /opt/qtsdk-2010.04/qt/src/3rdparty/libtiff/port/dummy.c