|  | 1 | 
            
              | OK response |  
              | No further information. |  | 
        
          |  | 2 | 
            
              | Syntax error |  
              | Error detected in syntax. |  | 
        
          |  | 3 | 
            
              | Invalid header |  
              | Invalid header segment received. |  | 
        
          |  | 4 | 
            
              | Invalid trailer segment |  
              | Invalid trailer segment received. |  | 
        
          |  | 5 | 
            
              | Unsupported syntax |  
              | Syntax version/release not supported. |  | 
        
          |  | 6 | 
            
              | Unsupported scenario type |  
              | Scenario type not supported. |  | 
        
          |  | 7 | 
            
              | Unsupported scenario version |  
              | Scenario version/release not supported. |  | 
        
          |  | 8 | 
            
              | Unsupported dialogue type |  
              | Dialogue type not supported for this scenario. |  | 
        
          |  | 9 | 
            
              | Unsupported dialogue version |  
              | Dialogue type version/release not supported. |  | 
        
          |  | 10 | 
            
              | Unauthorised sender |  
              | Sender not authorised. |  | 
        
          |  | 11 | 
            
              | Sender rejected |  
              | Sender rejected for administrative reasons. |  | 
        
          |  | 12 | 
            
              | Multiple transactions unsupported |  
              | Multiple parallel transactions not supported. |  | 
        
          |  | 13 | 
            
              | Multiple dialogues unsupported |  
              | Multiple parallel dialogues not supported. |  | 
        
          |  | 14 | 
            
              | Resources unavailable |  
              | Resources unavailable for requested function. |  | 
        
          |  | 15 | 
            
              | Unknown transaction |  
              | Referenced transaction does not exist. |  | 
        
          |  | 16 | 
            
              | Unknown dialogue |  
              | Referenced dialogue does not exist. |  | 
        
          |  | 17 | 
            
              | Invalid function |  
              | Function invalid for current dialogue state. |  | 
        
          |  | 18 | 
            
              | Service unavailable |  
              | Requested service is unavailable. |  | 
        
          |  | 19 | 
            
              | Application unavailable |  
              | Requested application not available. |  | 
        
          |  | 20 | 
            
              | Time-out |  
              | Response not received within expected time. |  | 
        
          |  | 21 | 
            
              | Unable to process interactively |  
              | To notify the initiator that a specific request cannot be processed interactively. |  | 
        
          |  | 22 | 
            
              | Correctable application error |  
              | To notify the initiator that an application error, that is correctable by the initiator, was made in the request message. |  | 
        
          |  | 23 | 
            
              | Nothing to return |  
              | To notify the initiator that there is no information to return in response to an inquiry. |  | 
        
          |  | 24 | 
            
              | Data not accessible |  
              | To notify the initiator that the requested information cannot be returned. |  | 
        
          |  | 25 | 
            
              | Non-correctable application error |  
              | To notify the initiator that some type of system or processing error was encountered, not related to the data received. |  |