server.callLog.utteranceSampling
                                                    Specifies the percentage of randomly-selected utterances saved as audio files.
| 
                                                                     Value  | 
                                                                
                                                                     Integer: 0–100. DEFAULT: 100  | 
                                                            
| 
                                                                     How to set  | 
                                                                
                                                                     If using the Management Station, set on the Speech Server service. If not using Management Station, set in an NSS configuration file (user-NSSxx.txt).  | 
                                                            
| 
                                                                     Usage  | 
                                                                
                                                                     It’s best to keep the default during development, deployment, and tuning of applications. After applications are well-established, you can lower the percentage to reduce system load and disk storage. The cost is that you cannot review audio for entire sessions because some iterations will be missing.  |