Actually, I should have said it does work when I use Speed Dialing, but not Linked Devices. That is, if I set up the Line Keys to use an extension number, like 123, it works fine (but the call appears to come from my outside line as identified by Caller ID).
I am trying to use the OBI Dashboard, and not the OBI Expert Configuration to set up these line keys. The dashboard doesn't give me the options you suggest. If I put in OBITalk, it prompts for the OBI number. I surely don't want to enter 9 digits!
Maybe it's not possible to set up the 1062's line keys to use two-digit dialing and place the call over the OBITalk network?