Establishing a telecommunication connection

摘要

A method for establishing a telecommunication connection between subscriber stations of a first and a second telecommunication system is claimed. Telecommunication connections are established by dialling (301) a number at a subscriber station of a mobile communication system and by sending (311) from the subscriber station a call set-up 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 part of the number that can be dialled by the subscriber station is corresponded to by a gateway number; dialling (301) at the subscriber station the part of the number and a subscriber number of the second telecommunication system; fetching (302) from the memory table of the subscriber station the gateway number corresponding to the part of the dialled number; entering (303) the fetched gateway number into the Called Party field of the call set-up message (311) and the subscriber number of the second telecommunication system into the External Subscriber Number field; sending (311) the call set-up message to the mobile communication system; establishing a telecommunication connection between the subscriber station of the first telecommunication system and the subscriber station of the second telecommunication system.