Thanks for the feedback. NO i did not yet play with com_zimbra_phone. So i will check this.
I have a question because of the zimlets icon problem. Do you use ZCS 5.08? There was
bug 30442 that caused other zimlets to invalidate the zimlets css. The quick fix is to remove the ';' at the end of css class ImgULogo in the local.css of com_zimbra_local zimlet.