Disclosed are systems and methods which provide for processing of calls by determining when a called number is associated with telephone having a portable interface and providing call processing adapted for addressing issues associated with a portable interface. Call processing may provide for point of demand processing of calls to facilitate completion of calls in real-time, even when such calls are directed to a wireless telephone, a telephone for which LNP has been utilized, or other telephone having a portable interface. If an appropriate relationship has not been already been established for facilitating a call to a telephone having a portable interface, embodiments operate to establish such a relationship. When it is determined that a called number is associated with telephone having a portable interface, embodiments operate to invoke rating schemes appropriate to the called number, possibly including flat rate schemes and rating determined using current location determination.