How To Fix T5149 - Unknown error occurred (see long text)

SAP Error Message - Details

• Message type: E = Error

• Message class: T5 - SAPphone: Messages for telephony

• Message number: 149

• Message text: Unknown error occurred (see long text)

What causes this issue?

The external software has reported an error with the return code &V1&.
This return code does not exist in the interface. Therefore, more
detailed information is not available.
Further information on the external software component:
&V2&

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

The return code for the underlying CTI software is: &V3&

Error message extract from SAP system. Copyright SAP SE.