Hovering over the ? information beside username, it just says: "Your account will be used in the Obi's authusername parameter". I don't know what this means.
I had a similar issue.
We need to deal with
three different Logins (plus a pin number) when setting up OBihai adapter:
1)
http://www.obitalk.com Login ID/Password
2) Voip provider (e.g. Voip.MS) Login ID/Password
3) OBihai box Login ID/Password
So it's relatively easy to confuse all these logins.
It's a design defect and should be fixed.
Names of these logins should be made more specific (e.g. like on my list above).