REDUCING LATENCY IN CIRCUIT SWITCHED DATA CALLS

1 . Apparatus, comprising

a receiving means for receiving a request for control of a data call with an analog bearer capability from a calling party which is attached to an originating switching apparatus of an originating circuit switched network wherein the data call is to be routed to a terminating switching device;

a determining means for determining a capability of the terminating switching device based on an identification of the terminating switching device; and

an originating instruction means for instructing the originating switching apparatus to reserve, for the data call, an originating interworking function for transforming the data call into a data flow of unrestricted digital information if the determined capability corresponds to unrestricted digital information.

2 . The apparatus according to claim 1 , wherein the identification of the terminating switching device is based on a mobile station roaming number of a called party which is an addressee of the data call.

3 . The apparatus according to claim 2 , wherein the determining means is configured to determine the capability based on the routing information comprised in the mobile station routing number.

4 . The apparatus according to claim 1 , wherein the identification of the terminating switching device is received from a home subscriber register.

5 . The apparatus according to claim 1 , wherein the unrestricted digital information is UDI with V.120 error correction.

6 . The apparatus according to claim 1 , wherein the analog bearer capability is non-transparent 3.1 kHz audio.

7 . The apparatus according to claim 1 , further comprising

informing means for providing an information to the terminating switching device about the reservation of the originating interworking function for unrestricted digital information for the data call.

8 . An apparatus, comprising

information receiving means for receiving an information about a reservation of an originating interworking function for an incoming data flow of unrestricted digital information; and

terminating instructing means for instructing a terminating switching device of a circuit switched network to reserve, for the incoming data flow, a terminating interworking function for transforming the incoming data flow into a data call with an analog bearer capability.

9 . A mobile softswitch comprising an apparatus according to claim 1 .

10 . A system, comprising

an originating control apparatus comprising

a receiving means for receiving a request for control of a data call with an analog bearer capability from a calling party which is attached to an originating switching apparatus of an originating circuit switched network wherein the data call is to be routed to a terminating switching device;

a determining means for determining a capability of the terminating switching device based on an identification of the terminating switching device;

an originating instruction means for instructing the originating switching apparatus to reserve, for the data call, an originating interworking function for transforming the data call into a data flow of unrestricted digital information if the determined capability corresponds to unrestricted digital information; and

informing means for providing an information to the terminating switching device about the reservation of the originating interworking function for unrestricted digital information for the data call;

the originating switching apparatus of the originating control apparatus;

a terminating control apparatus comprising

information receiving means for receiving an information about a reservation of an originating interworking function for an incoming data flow of unrestricted digital information; and

terminating instructing means for instructing a terminating switching device of a circuit switched network to reserve, for the incoming data flow, a terminating interworking function for transforming the incoming data flow into a data call with an analog bearer capability; and

the terminating switching device of the terminating control apparatus; wherein

the received information of the terminating control apparatus is provided by the informing means of the originating control apparatus;

the originating switching apparatus is adapted to reserve the originating interworking function according to the instruction of the originating control apparatus, to handle the data call by the originating interworking function to transform the analog data into a data flow of unrestricted digital information; and to route the data flow of unrestricted digital information to the terminating switching apparatus; and

the terminating switching apparatus is adapted to reserve the terminating interworking function for the incoming data flow and to handle the incoming data flow from the originating switching apparatus by the terminating interworking function.

11 . The system according to claim 10 , wherein the originating switching apparatus and the terminating switching apparatus are connected through an internet protocol based network, and wherein the originating switching apparatus is configured such that the data flow of unrestricted digital information is routed through the internet protocol based network.

12 . Method, comprising

receiving a request for control of a data call with an analog bearer capability from a calling party which is attached to an originating switching apparatus of an originating circuit switched network, wherein the data call is to be routed to a terminating switching device;

determining a capability of the terminating switching device based on an identification of the terminating switching device;

instructing the originating switching apparatus to reserve, for the data call, an originating interworking function for transforming the data call into a data flow of unrestricted digital information if the determined capability corresponds to unrestricted digital information.

13 . The method according to claim 12 , wherein the identification of the terminating switching device is based on a mobile station roaming number of a called party which is an addressee of the data call.

14 . The method according to claim 13 , wherein the determining is based on the routing information comprised in the mobile station routing number.

15 . The method according to claim 12 , wherein the identification of the terminating switching device is received from a home subscriber register.

16 . The method according to claim 12 , wherein the unrestricted digital information is UDI with V.120 error correction.

17 . The method according to claim 12 , wherein the analog bearer capability is non-transparent 3.1 kHz audio.

18 . The method according to claim 12 , further comprising

providing an information to the terminating switching device about the reservation of the originating interworking function for unrestricted digital information for the data call.

19 . A method, comprising

receiving an information about a reservation of an originating interworking function for an incoming data flow of unrestricted digital information; and

instructing a terminating switching device of a circuit switched network to reserve, for the incoming data flow, a terminating interworking function for transforming the incoming data flow into a data call with an analog bearer capability.

20 . A computer program product, embodied on a computer-readable storage medium, the computer program product comprising computer-executable components which perform, when the program is run on a computer, the execution of which result in operations of the method according to claim 12 .

21 . (canceled)