Sorry Oris, I would have responded earlier however I had mid-terms this week and didn't have a chance to.
As you said, "telephony card, Axon, carousel"... that's pretty much all you need to set-up your basic office call routing system. As for the routing to cell phones, do you mean for someone to manually transfer calls to cell phones, to auto-forward to a cellphones after x seconds, or to ring the cellphone(s) simultaneously with any internal extensions?
Of course if you want to set-up office extensions you will have to purchase IP Phones (or ATA adapters) and connect them to your network. After that they can connect directly to Axon and be set-up for inbound & outbound call routing.