I created a separate thread for Beocom 5 issues. No-one used it :)
The *only* problem I have at this point is that conference calls on my Beocom 5 are less effective than they once were. I hardly can hear the other caller(s). No idea why this has changed. There's no volume on the speaker, from what I can determine?
Never tried pstn/voip. Don't even know how to get that to work.
However, I WOULD recommend the Beocom 5. It can be a tad flaky at times though. See above, plus it can cut off callers when you walk around on the phone. This is a known and unfixed problem.