Question Author
Thanks Chris, thats very helpful, I will email the instructions and see what he does. I see your point about dialling tone on a mobile! The thing is though he is very deafa nd wears 2 hearing aids and when he uses his phone he has a loop system that he plugs in to it so to be honest he may hear a dialling tone I don't know.
I can't phone him as he only uses his loop system when he is using it and probably wouldn't hear it ring anyway. Thanks again for your help, you have got me out of some holes on many times.