This a mediastreamer2 plugin adding support for AMR codec. It is known to work with linphone>=3.0.0 It is based on the opencore-amr implementation: http://sourceforge.net/projects/opencore-amr/ You must first download, compile and install opencore-amr, then build the msamr plugin. The source code of opencore-amr can be found at http://sourceforge.net/projects/opencore-amr/files/opencore-amr/0.1.2/opencore-amr-0.1.2.tar.gz when compiling with mingw (for windows), remove .la files from your installation directory where you previously installed opencore-amr.