No, you can use CAR and it will give you the ALL the calls with details but it won't give you anything as I just mentioned in a report of just how many calls per phone, you'd need to do this report PER phone.
Same for missed calls, you'll see calls with 0 duration but you won't get "this phone had X missed calls"
For 4 there is no reporting on this. CAR will give you the call length (for each call) but there is no average value.
CAR cannot do this, you'd need to look into 3rd party billing servers.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...