OpenSUSE :: Java Media Framework (JMF) - Sip Communicator

I tried now for hours to run the sip-communicator. It ends up with the following errors

Code:
Failed to realize: com.sun.media.ProcessEngine@1d592a
Cannot build a flow graph with the customized options:
Unable to transcode format: LINEAR, 44100.0 Hz, 16-bit, Stereo, LittleEndian, Signed
to: gsm/rtp, 8000.0 Hz, Mono, FrameSize=264 bits
outputting to: RAW/RTP
Error: Unable to realize com.sun.media.ProcessEngine@1d592a
14:55:16.400 SCHWERWIEGEND: impl.media.MediaControl.createDataSourceForEncodings().839 Couldn't realize sourceProcessor
14:55:16.400 SCHWERWIEGEND: impl.protocol.sip.OperationSetBasicTelephonySipImpl.processInviteOK().731 We failed to process the SDP description of sip:100@192.168.1.10(sip:100@192.168.1.10). Error was: Couldn't realize sourceProcessor .....

I figured out that this has something to do with the Java Media Framework, which is installed. So I played a little with JMStudio. But this dosen't work, too. It doesn't matter which sample rate I chose. I always receive the following message.
Failed to prefetch: cannot open the audio device.
The only audio device I can chose is the JavaSound audio capture. I'm logged in as root.
printenv

Code:
CLASSPATH=/usr/bin/JMF-2.1.1e/lib/jmf.jar:.:
JMFHOME=/usr/bin/JMF-2.1.1e
JAVA_HOME=/usr/lib/jvm/java-1.6.0-sun
LD_LIBRARY_PATH=/usr/bin/JMF-2.1.1e/lib:/usr/lib/mpi/gcc/openmpi/lib

Versions:
openSuse 11
Java 1.6 jdk
JMF2.1.1e
sip-communicator alpha2/alpha3 (tested both)