If you need documentation for an OBi 200/300 series firmware feature that's not mentioned in the September 2013 (latest) OBi Device Admin Guide, try the OBi Phone Admin Guide instead:
https://www1.obitalk.com/Downloads/dev/doc/OBiPhoneAdminGuide.pdf
Worked for me and my 3.0.1.4581 firmware. YMMV.
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