Patent ID: 8036234

Claim:
A method for forwarding signaling data in an interworking unit (IM-MGW), comprising: in an interworking unit, which transmits payload data between a first data transmission network, in which signaling is in accordance with a first signaling method, and a second data transmission network in which signaling is in accordance with a second signaling method, receipt of data from the first data transmission network via a bearer connection in which for a bearer service signaling data and payload data are transmitted between two mobile stations or a group of mobile stations, with the first signaling method differing from the second signaling method, in the interworking unit, separation of signaling data and of payload data, forwarding of the received signaling data in unchanged form from the interworking unit to a media gateway control function, in the interworking unit, forwarding of the payload data from the first data transmission network to the second data transmission network, with the media gateway control function ending or beginning signaling in accordance with the first signaling method, with the signaling data relating to a video telephony connection between the two mobile stations or the group of mobile stations, and where the signaling data is transmitted packed into the H.248 protocol from the interworking unit to the media gateway control function and from the media gateway control function to the interworking unit.