dtmf-interdigit-timeout
                                                    Specifies the maximum time allowed between each DTMF character entered by the user.
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                                                                     Value  | 
                                                                
                                                                     Integer: 0–INT_MAX (milliseconds) DEFAULT: MRCP 5000  | 
                                                            
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                                                                     How to set  | 
                                                                
                                                                     Shown in precedence order (see Rules of parameter precedence): In a VoiceXML application, using the interdigittimeout property in a <property> element. In the browser, using the DTMF-Interdigit-Timeout header in a RECOGNIZE, SET-PARAMS, or GET-PARAMS method. In the application's session xml in the <speechrecog> section of <speechserver> under <sessionparameters>.  | 
                                                            
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                                                                     Usage  | 
                                                                
                                                                     Seldom used.  |