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from the Plum Voice IVR Glossary
The grammarmaxage tells the platform the maximum acceptable age, in seconds, of cached grammars. Setting "grammarmaxage" to NULL allows the platform to honor expiration time set by the web server. The default value for this property is NULL. If the "grammarmaxage" is set to 150 seconds and the "grammarmaxstale" value is set to 25 seconds, it will set a global property that stipulates that all grammar tags (<goto>, <submit>, etc.) have a maxage value of 150 seconds and a maxstale value of 25 seconds. So, since the file "lastname.php" is inside of a <grammar> tag, it would have a maxage value of 150 seconds and a maxstale value of 25 seconds because of the "grammarmaxage" and "grammarmaxstale" properties.
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