DIA-24406
        API mode switch is disallowed when a call is in progress.
        
        
        Cause
        A mode switch from OCI8 to OCI7 was attempted in a callback.
        Action
        The user should perform the API mode switch either prior to initiating the top call or after the main call is done.
        
     
    
    
        DIA-24406
        API mode switch is disallowed when a call is in progress.
        
        
        Cause
        A mode switch from OCI8 to OCI7 was attempted in a callback.
        Action
        The user should perform the API mode switch either prior to initiating the top call or after the main call is done.
        
     
    
    
        DIA-24406
        API mode switch is disallowed when a call is in progress.
        
        
        Cause
        A mode switch from OCI8 to OCI7 was attempted in a callback.
        Action
        The user should perform the API mode switch either prior to initiating the top call or after the main call is done.