Patent ID: 7089010
Filing Date: 2006-08-08
Classification: H04W

Abstract:
1. An apparatus for transmission of a calling subscriber number identification received at a home Public Land Mobile Network (“PLMN”) or at an InterWorking Function (“IWF”), comprising: first means for interrogating at least one entity selected from GSM network entities, UMTS network entities, and Inter-Working Functions by at least one interrogating operation selected from GSM MAP operations, UMTS MAP operations, and combinations thereof in order to retrieve a routing number and reach a destination subscriber who is a roaming subscriber roaming in a visited PLMN and set up the call; second means for extracting the calling subscriber number identification from a previously received signalling message to be further sent in an interrogating operation selected from OSM MAP operations, UMTS MAP operations, and combinations thereof; and third means for including the calling subscriber number identification extracted by the second means in the interrogating GSM/UMTS MAP operation in order to retrieve a routing number and reach such a roaming subscriber and set up the call, presenting the calling subscriber number identification.