METHOD AND APPARATUS FOR PROVIDING CALLING SERVICE FEATURES WITHIN INCOMPLETELY UPGRADED CELLULAR TELEPHONE NETWORKS

摘要

For a call (50, 100) received by an originatingswitching node (12(1)) in a cellular telephonenetwork (10) that does not support all upgradedcalling service features (52), the all is redirectedand transited (60) for further handling to anupgraded service switching node (12(2)). Alternatively,the call is redirected and transited onlywhen the originating switching node has not beenupgraded to support subscripted to calling servicefeatures (64) or a certain initiated calling servicefeature (74). As another alternative, the call ishandled by the originating switching node (i.e.,through connected to a service switching node(82)) up until such time as a calling service featureis initiated (84), and is then redirected and transited(94) if the initiated calling service feature isnot supported (86).