Service unit

Service unit (SSP;

• LLIN) for controlling the setting-up of communication connections by a communication network (TELENET), wherein the service unit (SSP;
• LLIN) is provided with a communications unit (INT) for communication with at least one IN server (SCP1 to SCP3) and is provided with a control unit (CONTR;
• CONTR′) that is configured so that, during the call set-up of communication connections it initiates the transmission of at least one service request message (SR) for requesting an IN service to at least one network server (SCP1 to SCP3) if the respective communication connection that is to be set up fulfils predetermined trigger conditions,
• configuring the control unit (CONTR;
• CONTR′) further so that it classifies the service request messages (SR) transmitted to the at least one network server (SCP1 to SCP3) as essential or non-essential,
• configuring the control unit (CONTR;
• CONTR′) further so that it monitors the operability of the at least one network server, and that the control unit (CONTR;
• CONTR′) is further configured so that if it determines that the operability of one of the network servers (SCP1 to SCP3) is impaired, initiating the further call set-up of those communication connections for which a service request message classified as non-essential has been transmitted to this network server, and the service requested by this service request message has not yet been provided, and initiating the termination of the further call set-up of those communication connections for which a service request message classified as essential has been transmitted to this network server and the service requested by this service request message has not yet been provided.