My understanding is that Obi 2** series units have one, two, and three star codes.
My memory is that triple stars codes were system functions such as DHCP address, and dual were trunk codes.
Is there a list of all of them somewhere? I saw the admin handbook but searching it found lots on customizing dialing strings but no list that I sought.
Page 27, 28....
Just search for ***
Single star codes are here: https://www.obitalk.com/info/documents/misc/OBiFeatureStarCodes.pdf