ESTABLISHING A TELECOMMUNICATION CONNECTION

摘要

A method for establishing a telecommunication connection between subscriber stations of a first and a second telecommunication system, whereby telecommunication connections are established by dialling (301) a number at a subscriber station of the mobile communication system and by sending a call set-up message from the subscriber station of the mobile communication system, the message comprising a Called Party field and an External Subscriber Number Field. The method comprises: maintaining at the subscriber station of the mobile communication system a memory table, wherein a number that can be dialled by the subscriber station (400) is corresponded to by a gateway number; dialling (301) the number at the subscriber station; fetching (302) from the memory table of the subscriber station the gateway number corresponding to the dialled number; entering (303) the fetched gateway number into the Called Party field of the call set-up message and a number into the External Subscriber Number Field; sending (307) the call set-up message to the mobile communication system; establishing (308) a telecommunication connection between the subscriber station of the first telecommunication system and the subscriber station of the second telecommunication system.