I just installed Linphone in Ubuntu 12.10. It works, but I'm trying to get the G729 codec to work. I downloaded the sourcecode tarball. I also installed "mediastreamer-dev" and "ortp", and when I ran configure, I saw the confirmation that mediastreamer was there. When I built bcg729, indeed it seems the mediastreamer2 plugins got built -- they got installed at "/usr/local/lib/mediastreamer/plugins". However, Linphone doesn't seem to see them.
Do you have any idea whether "/usr/local/lib/mediastreamer/plugins" is the correct place for the plugins to be installed on Ubuntu? I have Googled this but I am not finding any hints.
It seems that at least SOME mediastreamer items are in a different location on Ubuntu. For example:
/usr/lib/x86_64-linux-gnu/libmediastreamer.so.1