After using the VoIP client a while with a few people one of the main comments I have had is about the Buttons used for the Menu items. It is quite difficult to see whether they are toggled on or off and they move around if in 'Desk phone' mode or 'Head set' mode. Also you don’t really need so many for example if you are in Desk Phone mode you only need a Headset mode button and vice versa. Things like the add/remove column does not really need to be available all the time its fine to be within the drop down menus. The general consensus is that they are not very intuitive and could be improved.