rsriram22,
1) obi100US will call obi110overseas as **9 123 456 789 (assuming 123456789 is the obi110overseas's obi #)
Yes. One of two things should happen after you dial that number depending how things are configured. If the local OBi is in the COT of the overseas OBi you will get the AA. If not in the COT, it should simply ring the overseas phone.
2) access obi110overseas line port from obi100US using **9 123 456 789 **8 <overseasnumbergoeshere>
[am assuming all of these numbers needs to be dialed in quick succession]. I can configure quick dial later..
No. Again depending on how things are configured you get different behavior. If local OBi is in the COT of the overeas OBi it will get the AA. The AA will offer three options. Option#2 is to make a new call. If your intent is to make a call using the connected POTS line you can make an outgoing call on that trunk using **8 or automatically by assging the AA PrimaryLine=PSTN Line. This is what you call a 2 stage call. A more complicated setup can be had where you can have a 1 stage call, where you dial the overseas number on the local OBi and depending on the dial plan it will send it automatically to the PSTN line of the overseas OBi. If you set it up with the AA consider putting frequently called numbers in the speed dial of the overseas OBi. Come to think of it you can even put it in the speed dial of the local OBi and automatically make the call over the PSTN line of the overseas OBi.
3) Do i get the line port's dial tone after **9 123 456 789 **8 ? (before i start the local # that is?)
No. Read above explanations.
4) Any overseas numbers (local to the country where obi110overseas is located, or otherwise) calling the line port# associated to obi110overseas will not get forwarded/answered by obi110overseas, but are handled as though there is no obi110overseas in the picture, right?
It depends if you set it up as a 2 stage dial or a 1 stage dial call strategy. If 2 stage dialing is used, it is obvious that there is another machine in the loop. If 1 stage is implemented, it becomes automatic. Like usual there is always a tradeoff between different choices. It comes down to a question of time and effort in figuring out how to set it up.
If 1 stage dialing is what you want, then look up RonR posts explaining how to set this up. My head is swimming with so many different ways to configure these units.
Have fun.