Method for providing CTI services and/or performance features over a communication channel comprising multiple communication links, characterized in that a) in the method, a transmission of a service or performance feature request, a device identifier (Device ID) and a connection identifier (Connection ID) are transferred as parameter from a CTI client (111, 112, 113) to a CTI server, b) after a transmission of a request for a CTI service and/or performance feature for a selected communication connection, an association between a device identifier (Device ID), a connection identifier (Connection ID) and the requested CTI service and/or performance feature is established, wherein an association identifier designating the association is used as transferred parameter, c) a control sequence for adjusting the requested CTI service and/or performance feature with indication of an association identifier, which designates the association between the device identifier (Device ID), the connection identifier (Connection ID) and the requested CTI service and/or performance feature, is called up as transferred parameter, d) for establishing the association between the device identifier (Device ID), the connection identifier (Connection ID) and the requested CTI service and/or performance feature, a control and/or monitoring process is generated for changing a switching state of the selected communication connection as a function of defined results, and the device identifier, the connection identifier and a process identifier designating the generated control and/or monitoring process are stored in a process list, wherein the state of the selected communication connection is changed in such a manner that it reflects the requested CTI service and/or the requested CTI performance feature, e) after the generation of the control and monitoring process, the device identifier (Device ID) and the connection identifier (Connection ID) are revalued into port (device) and path indications for use by a switching control device, f) after subsequent determination of the process identifier, which so far is not known to the CTI server, on the basis of the port and path indications, as well as of the process list managed by the switching control device, and g) the called up control sequence for providing the requested CTI service and/or performance feature is processed with evaluation of the association identifier. a) in the method, a transmission of a service or performance feature request, a device identifier (Device ID) and a connection identifier (Connection ID) are transferred as parameter from a CTI client (111, 112, 113) to a CTI server, b) after a transmission of a request for a CTI service and/or performance feature for a selected communication connection, an association between a device identifier (Device ID), a connection identifier (Connection ID) and the requested CTI service and/or performance feature is established, wherein an association identifier designating the association is used as transferred parameter, c) a control sequence for adjusting the requested CTI service and/or performance feature with indication of an association identifier, which designates the association between the device identifier (Device ID), the connection identifier (Connection ID) and the requested CTI service and/or performance feature, is called up as transferred parameter, d) for establishing the association between the device identifier (Device ID), the connection identifier (Connection ID) and the requested CTI service and/or performance feature, a control and/or monitoring process is generated for changing a switching state of the selected communication connection as a function of defined results, and the device identifier, the connection identifier and a process identifier designating the generated control and/or monitoring process are stored in a process list, wherein the state of the selected communication connection is changed in such a manner that it reflects the requested CTI service and/or the requested CTI performance feature, e) after the generation of the control and monitoring process, the device identifier (Device ID) and the connection identifier (Connection ID) are revalued into port (device) and path indications for use by a switching control device, f) after subsequent determination of the process identifier, which so far is not known to the CTI server, on the basis of the port and path indications, as well as of the process list managed by the switching control device, and g) the called up control sequence for providing the requested CTI service and/or performance feature is processed with evaluation of the association identifier.