Voip +Asterix + KXT6161 + 10 ext


can you tell me if it possible to run:

voip line(thinking about VONAGE)(on one of our bt lines) <->Asterix(with call logging) + 10 analog ext(hotel rooms)

this line(BT not yet VOIP) is connected to analog pbx panasonic kxt6161 so now guest from 10 rooms can call where ever they want using this line

i want to connect those 10 analog ext to asterix (run call logging )and change this line to voip so it will be cheaper and i can charge guest for calling

after connecting asterix and running voip is it posible to connect analog pbx so for example office people (analog pbx) can call guest rooms ??