I was able to achieve the same thing in Suse 10.0, should work in any other Suse also. The only difference was that I converted the .deb to .rpm with alien and installed everything with YaST. I did the same sym linking.
Code:
su
[enter root password]
cd /usr/lib
ln -s libexpat.so.0 libexpat.so.1
Then ignore the error about libexpat.so.1 in YaST when installing the libsipphone package.
Now you can run gizmo by just typing 'gizmo' in a terminal, or you can always make a desktop or menu link for it.
Happy SIPing!