I get huge lags in the application interface, even in the Preferences dialog. It seems to hang completely when I try to call using my Jumblo account...

Got it to connect to my home PBX, but no audio. The sound system is working fine; under Linphone "preferences" I can test the ring sound just fine. I've fiddled with both GSM and PCM codecs, but never a whisper of audio.

It's no Skype, but then it runs on the Pandora, which is something Skype doesn't do (yet).Volume seemed very quiet on both my desktop and Pandora; maybe just not got it set up quite right though. It's also hard to test by yourself :)