Android: documentation for content://sms/ "type" values?

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http://stackoverflow.com – I know that the content://sms/ provider is not officially supported in Android. Nonetheless, I'm wondering if there are some commonly used conventions for the values that appear in the "type" column that can be returned from content://sms/ queries. For example, I know that types "1" and "2" often represent "incoming" and "outgoing", respectively. Are there any other type values that are commonly used? For example, I sometimes see type "20". Thanks in advance for any pointers to information or discussions about this. (HowTos)