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1. (WO1997017790) ADAPTING THE FIXED NETWORK PROTOCOLS TO A MOBILE COMMUNICATIONS NETWORK
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Claims :

1. A method and arrangement for establishing a mobile-terminating call in a mobile communications network when the call is received from a calling party via a fixed network without any signalling support carrying information on the protocol employed by the calling party, c h a r a c t e r i z e d by
receiving a call to a directory number of a subscriber, said directory number being assigned to a data service employing two or more alternative protocols towards the fixed network,
retrieving from the subscriber data a service definition linked with said directory number, the protocol parameter of said definition having a neutral value or a value that is interpreted as neutral,
assigning an interworking function resource in accordance with said service definition, omitting the definition of the protocol due to said neutral value or the value that is interpreted as neutral,
monitoring by means of the assigned interworking function resource the traffic channel received from the fixed network,
identifying the protocol employed by the calling party on the basis of signalling characteristic thereof,
configuring said assigned interworking function resource to employ said identified protocol towards said calling party.
2. A method as claimed in claim 1,
c h a r a c t e r i z e d by
identifying the protocol of the calling party as a CCITT V.llO rate adaptation protocol provided that a V.llO synchronization frame is received from the traffic channel, configuring said assigned interworking function resource to employ V.llO protocol.
3. A method as claimed in claim 1,
c h a r a c t e r i z e d by
identifying the protocol of the calling party as a CCITT V.120 rate adaptation protocol provided that a V.120 frame flag is received from the traffic channel,
configuring said assigned interworking function resource to employ V.120 protocol.
4. A method as claimed in claim 1,
c h a r a c t e r i z e d by
receiving from the traffic channel a V.120 frame flag,
transmitting V.120 frame flags to another traffic channel,
identifying the protocol of the calling party as a CCITT V.120 rate adaptation protocol provided that a data link setup message according to V.120 protocol is received from the traffic channel,
configuring said interworking function resource to employ the V.120 protocol.
5. An arrangement for establishing a mobile-terminating data call in a mobile communications network when a call is received from a calling party (TE) via a fixed network (PSTN, ISDN) without signalling support that carries the information on the protocol employed by the calling party,
c h a r a c t e r i z e d by
the subscriber database (HLR) of the mobile communications network having one directory number defined for a subscriber's data service that employs two or more alternative protocols towards the fixed network, the protocol parameter of a service definition linked with said directory number having a neutral value or a value that is interpreted as neutral,
the mobile network being arranged, in a mobile-terminating (MS) call to said directory number, to assign an interworking function apparatus (IWF) according to the service definition, but to omit the configuration of the protocol employed in the direction of the fixed network (PSTN, ISDN) due to the neutral value of said protocol parameter or the value that is interpreted as neutral,
said assigned interworking function apparatus

(IWF) being arranged to monitor a traffic channel received from the fixed network, to identify the protocol employed by the calling party (TE) on the basis of signalling characteristic thereof, and to configure itself to employ said identified protocol towards said calling party.
6. An arrangement as claimed in claim 5, c h a r a c t e r i z e d by the protocol employed by the calling party (TE) being a CCITT V.llO rate adaptation protocol, and said signalling characteristic of the protocol containing a V.llO signalling frame.
7. An arrangement as claimed in claim 5, c h a r a c t e r i z e d by the protocol employed by the calling party (TE) being a CCITT V.120 rate adaptation protocol, and said signalling characteristic of the protocol containing a V.120 frame flag or a V.120 data link setup message.
8. An interworking function apparatus of a mobile communication network for achieving a protocol adaptation when a call is received from the calling party via a fixed network without signalling support that carries the information on the protocol employed by the calling party, c h a r a c t e r i z e d by
the interworking function apparatus (IWF) being arranged, in a mobile-terminating (MS) call, to assign interworking function resources according to the service definition obtained from the subscriber database, but to omit the configuration of the protocol employed towards the fixed network (PSTN, ISDN) if the protocol parameter of said service definition has a neutral value or a value that is interpreted as neutral,
the assigned interworking function apparatus (IWF) being arranged to monitor a traffic channel received from the fixed network, to identify the protocol employed by the calling party (TE) on the basis of signalling characteristic thereof, and to configure said assigned interworking function resources to employ said identified protocol towards said calling party (TE) .