Many thanks for your reply. Unfortunately, I've already been in touch with someone from Vodia who has taken a look at our system. I've sent him a list of issues that need to be resolved but have not heard back - despite chasing up. I don't know if this means that our system is in such a mess or that I've managed to put him off!
We're running version 4.5 - I can upload Domain Status Overview (once I figure it out). We have a mixture of handsets; 870/820/710/320/300/M9. The M9s are very handy for our open-plan office but call quality is not great a lot of the time and we get dropped calls etc.
mike