360 it is determined whether the call can be completed in accordance with the highest priority atn e g based on the availability of the first alternate telephone station if the first atn is available control proceeds to step 365 where the call is completed at the first atn and control proceeds to step 415 where the method ends otherwise control proceeds to step 370 where the incoming call is disconnected from the first atn and the incoming call is parked control then proceeds to step 375 step 375 determines whether additional atns are listed in the scp database and may be used to forward the incoming call if additional atns are available control proceeds to step 330 in fig3 for routing based on the remaining atn information steps 330 375 are performed for the atns listed in the scp database in order of priority if during the call forwarding of steps 330 375 the incoming call is completed control proceeds to step 415 where the method ends otherwise control proceeds to step 380 in which it is determined whether a url field in the database identifies a url that contains information about the present location of the subscriber such as further alternative telephone numbers if the field fails to indicate a url control proceeds to step 410 where the incoming call is routed to the ptn so that the calling party may leave an answering machine message or voice mail if those are options or services offered by the called party control then proceeds to step 415 where.