My experience with Orange is that they will tell you whatever you want to hear to upgrade/keep you as a customer. Their after sales service is appalling IMO!
I went in to one of the shops once, that’s not much better either.
The VOIP service I have is great, they are sending me a domestic system to try, if it’s as good, I’ll let you have the details, should have it soon.
http://www.survivefrance.com/t/orange-you-have-got-to-be-joking/3749