Which call feature module, if any, is invoked in response to a user's input of a feature access code is made dependent upon the context in which the feature request is made, in a call-processing arrangement (200) that uses stored definitions of syntax (320, 350) and grammar (400, 410) of the network...http://www.google.de/patents/US5289535?utm_source=gb-gplus-sharePatent US5289535 - Context-dependent call-feature selection
