A device for controlling communication connections in a packet-oriented communication system, comprising - at least one communication master computer (SRV1, SRV2) for controlling communication connections based on exchanged signaling messages of a respectively preset communication protocol; characterized in that the communication system further comprises - at least one service provider unit (PRX1, PRX2) being configured as representative master computer unit and thus as proxy server, for providing connection-establishing and - controlling communication services based on bidirectional communication service calls having at least one service receiver unit (SC1, SC2), wherein the calling service receiver unit of the at least one service receiver unit (SC1, SC2) can be registered in advance with the associated service provider unit; the following being provided in the at least one service provider unit (PRX1, PRX2): - interfaces with the at least one service receiver unit (SC1, SC2) as well as with the at least one communication master computer (SRV1, SRV2), which converts the signaling message between the respective preset communication protocols; - means for characterizing an obtained signaling message and for capturing parameters contained in the signaling message and for association to a communication service; - means for generating at least one signaling message as a result of a communication service call of the at least one service receiver unit (SC1, SC2); - wherein the at least one service receiver unit (SC1, SC2) calls a communication service based on a web service via a communication service call, which is independent of the preset communication protocol; and - wherein the associated service provider unit (PRX1, PRX2) sends a request prompt having the parameters, which is independent of the preset communication protocol, to the at least one communication master computer (SRV1, SRV2). - at least one communication master computer (SRV1, SRV2) for controlling communication connections based on exchanged signaling messages of a respectively preset communication protocol; - at least one service provider unit (PRX1, PRX2) being configured as representative master computer unit and thus as proxy server, for providing connection-establishing and - controlling communication services based on bidirectional communication service calls having at least one service receiver unit (SC1, SC2), wherein the calling service receiver unit of the at least one service receiver unit (SC1, SC2) can be registered in advance with the associated service provider unit; - controlling communication services based on bidirectional communication service calls having at least one service receiver unit (SC1, SC2), wherein the calling service receiver unit of the at least one service receiver unit (SC1, SC2) can be registered in advance with the associated service provider unit; - interfaces with the at least one service receiver unit (SC1, SC2) as well as with the at least one communication master computer (SRV1, SRV2), which converts the signaling message between the respective preset communication protocols; - means for characterizing an obtained signaling message and for capturing parameters contained in the signaling message and for association to a communication service; - means for generating at least one signaling message as a result of a communication service call of the at least one service receiver unit (SC1, SC2); - wherein the at least one service receiver unit (SC1, SC2) calls a communication service based on a web service via a communication service call, which is independent of the preset communication protocol; and - wherein the associated service provider unit (PRX1, PRX2) sends a request prompt having the parameters, which is independent of the preset communication protocol, to the at least one communication master computer (SRV1, SRV2).