SAP Message BCOMEC026 - Work mode &1 is not supported

Diagnosis
The work mode &V1& is not supported by the external software component.
Further information on the external software component:
V3

Procedure for System Administration
The error can occur in 2 different places:
1. In the connected gateway
2. In the underlying CTI software
In this case the error occurred in (&V4&).
The return code for the underlying CTI software is: &V2&