Telecommunication system

Telecommunication system for providing a call between a first subscriber station (2) and a second subscriber station (3,4,5) wherein the first subscriber station is a mobile subscriber station which is connected to a first mobile radio telecommunication network (6), comprising:

• location information extracting means (9) for extracting location information indicating a current location of the first mobile subscriber station (2) in the first mobile radio telecommunication network (6) from network information available in the first mobile radio telecommunication network (6);
• location information providing means (1) for providing said location information to the second subscriber station (3,4,5) in response to a request requesting said location information;
• location information translating means (15) for translating said location information into geographical information;
• geographical area determining means (12) for determining whether the first subscriber station (2) is located within a predetermined geographical area;
• and
• routing means (13) for routing a call set-up request to the first subscriber station to set up a call between the first subscriber station (2) and the second subscriber station (3) only if the first subscriber station is within the predetermined geographical area.

Telecommunication system for providing a call between a first subscriber station (2) and a second subscriber station (3,4,5) wherein the first subscriber station is a mobile subscriber station which is connected to a first mobile radio telecommunication network (6), comprising:

• location information extracting means (9) for extracting location information indicating a current location of the first mobile subscriber station (2) in the first mobile radio telecommunication network (6) from network information available in the first mobile radio telecommunication network (6);
• location information providing means (10) for providing said location information to the second subscriber station (3,4,5) in response to a request requesting said location information;
• geographical area determining means (12) for determining whether the first subscriber station (2) is located within a predetermined geographical area;
• routing means (13) for routing a call set-up request to the first subscriber station to set up a call between the first subscriber station (2) and the second subscriber station (3) only if the first subscriber station is within the predetermined geographical area;
• and
• the second subscriber station (3, 4, 5) being connected to one of the group consisting of the first mobile radio telecommunication network (6), a switched telephone network (7) connected to the first mobile radio telecommunication network (6), a second mobile radio telecommunication network (8) connected to the first mobile radio telecommunication network (6).

Method for setting-up a call in a telecommunication system between a first subscriber station and a second subscriber station, wherein the first subscriber station is a mobile subscriber station which is connected to a first mobile radio telecommunication network, comprising the steps of:

• receiving a request for obtaining location information (S10) concerning the first subscriber information from the second subscriber station;
• extracting location information (S11) indicating a current location of the first subscriber station from network information available in the first mobile radio telecommunication network;
• determining whether the first subscriber station is located within a predetermined geographical area;
• and
• routing a call set-up request to the first subscriber station to set-up a call between the first subscriber station and the second subscriber station only if the first subscribers station is within the predetermined geographical area.

Switching means of a mobile telecommunication system for providing a call between a first subscriber station (2) and a second subscriber station (3,4,5) wherein the first subscriber station is a mobile subscriber station which is connected to a first mobile radio telecommunication network (6), comprising:

• location information extracting means (9) for extracting location information indicating a current location of the first subscriber station (2) in the first mobile radio telecommunication network (6) from network information available in the first mobile radio telecommunication network (6);
• location information providing means (10) for providing said location information concerning the first subscriber station (2) to the second subscriber station (3,4,5) in response to a request requesting said location information;
• geographical area determining means (12) for determining whether the first subscriber station (2) is located within a predetermined geographical area;
• and
• routing means (13) for routing a call set-up request to the first subscriber station to set up a call between the first subscriber station (2) and the second subscriber station (3) only if the first subscriber station is within the predetermined geographical area.

Switching means of a mobile telecommunication system for providing a call between a first subscriber station (2) and a second subscriber station (3,4,5) wherein the first subscriber station is a mobile subscriber station which is connected to a first mobile radio telecommunication network (6), comprising:

• location information extracting means (9) for extracting location information indicating a current location of the first subscriber station (2) in the first mobile radio telecommunication network (6) from network information available in the first mobile radio telecommunication network (6);
• location information providing means (10) for providing said location information concerning the first subscriber station (2) to the second subscriber station (3,4,5) in response to a request requesting said location information;
• geographical area determining means (12) for determining whether the first subscriber station (2) is located within a predetermined geographical area;
• and
• routing means (13) for routing a call set-up request to the first subscriber station to set up a call between the first subscriber station (2) and the second subscriber station (3) only if the first subscriber station is within the predetermined geographical area;
• the second subscriber station (3, 5, 6) being connected to one of the group consisting of the first mobile radio telecommunication network (6), a switched telephone network (7) connected to the first mobile radio telecommunication network (6) and a second mobile radio telecommunication network (8) connected to the first mobile radio telecommunication network (6);
• and
• the first and second mobile radio telecommunication networks being a part of a global system for mobile communications (GSM) and the switched telephone network (7) being one of a group consisting of an integrated services digital network (ISDN) and a data network.

Switching means of a mobile telecommunication system for providing a call between a first subscriber station (2) and a second subscriber station (3,4,5) wherein the first subscriber station is a mobile subscriber station which is connected to a first mobile radio telecommunication network (6), comprising:

• location information extracting means (9) for extracting location information indicating a current location of the first subscriber station (2) in the first mobile radio telecommunication network (6) from network information available in the first mobile radio telecommunication network (6);
• location information providing means (10) for providing said location information concerning the first subscriber station (2) to the second subscriber station (3,4,5) in response to a request requesting said location information;
• location information translating means (15) for translating the said location information into geographical information;
• geographical area determining means (12) for determining whether the first subscriber station (2) is located within a predetermined geographical area;
• and
• routing means (13) for routing a call set-up request to the first subscriber station to set up a call between the first subscriber station (2) and the second subscriber station (3) only if the first subscriber station is within the predetermined geographical area.