Method for call establishment
First Claim
1. A method for requesting a telecommunications link between a calling terminal having a memory, the calling terminal being in connection with a first telecommunications network and being used by a user, and a target terminal associated with a target telephone number, the target terminal being in connection with a second telecommunications network, where the first telecommunications network and the second telecommunications network are interconnected using a gateway wherein establishing the telecommunications link is initiated by the user dialling the target telephone number associated with the target terminal, the method being characterised by the steps of:
- associating the target telephone number with a single call type;
the association being made in the memory of the calling terminal;
extracting from the memory a gateway address of the gateway associated with the call type, and;
requesting the telecommunications link through the gateway using the gateway address.
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Accused Products
Abstract
A call establishment method and corresponding communications terminal for a trunked radio network such as TETRA (708, 709) to establish a call from one network (700) to another network (711, 712, 730, 741) through a gateway (701, 713, 733, 740). A target telephone number is dialled at the calling communications terminal storing unique associations between telephone numbers and call types. Alternatively the call type is requested from a user of the calling communications terminal in case no call type is stored with the target telephone number. The gateway (701, 713, 733, 740) through which the target telephone number can be reached is then selected on the basis of the call type.
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Citations
29 Claims
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1. A method for requesting a telecommunications link between a calling terminal having a memory, the calling terminal being in connection with a first telecommunications network and being used by a user, and a target terminal associated with a target telephone number, the target terminal being in connection with a second telecommunications network, where the first telecommunications network and the second telecommunications network are interconnected using a gateway wherein establishing the telecommunications link is initiated by the user dialling the target telephone number associated with the target terminal, the method being characterised by the steps of:
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associating the target telephone number with a single call type;
the association being made in the memory of the calling terminal;extracting from the memory a gateway address of the gateway associated with the call type, and; requesting the telecommunications link through the gateway using the gateway address. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 21, 28, 29)
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14. A communications terminal comprising:
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a transceiver for two way information exchange with a first telecommunications network; a memory, and; data processing means for controlling the transceiver and the memory, wherein the terminal is used to establish communication with a target telephone number associated with a second telecommunications network, the first telecommunications network and the second telecommunications network being interconnected by a gateway, wherein the data processing means associates the target telephone number with a single call type, the association being made in the memory, compares the target telephone number with a stored telephone number stored in the memory, extracts the call type from the memory, extracts a gateway address of the gateway associated with the call type which interconnects the first telecommunications network and the second telecommunications network and operates the transceiver to establish communication with the target telephone number through the gateway by sending a message containing the target telephone number and the gateway address to the first telecommunications network. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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- 22. A telecommunications system with a plurality of gateways for offering interconnection between a first telecommunications network and a second telecommunications network, wherein a communication link can be established between a first communications terminal being in connection with the first telecommunications network and a second communications terminal being in connection with the second telecommunications network through one of the plurality of gateways, the second communications terminal being associated with a target telephone number wherein the target telephone number is associated with a single call type in the memory of the first communications terminal and the communication link from the first communications terminal to the second communications terminal is established over the one of the plurality of gateways related to the call type.
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26. A computer program product for establishing a telecommunications link from a first telecommunications network to a target telephone number in a second telecommunications network through a gateway the computer program product comprising:
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computer executable code means to compare the target telephone number with numbers stored on a storage medium; computer executable code means to associate the target telephone number with a single call type, the association being made in a memory of a calling terminal in the first telecommunications network; computer executable code means to extract a gateway address of the gateway associated with the call type, and; computer executable code mans to establish the telecommunications link through the gateway. - View Dependent Claims (27)
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Specification