“it’s hard to know whether a subscriber will be able to answer its phone or not ! “no answer” means the phone’s ringing, but the sub can’t reach its phone, isn’t it ? there’s no way to plan it, unless we put a GPS on the phone, a GPS on (or in ?) the user, check the distance between them, and see if the user is moving fast enough :))”
By subscriber I mean both the subscribers. If ‘A’ party subscriber generates too many attempts, then why not impose some charges upon him.