Chen,
First, DN is Nortel-speak for extension. Now, as to swapping extensions. The easiest by far is to use set relocation. I'm assuming you have relatively new programming. If so, when you enter programming (feature ** 266344 266344) you will see "Terminals&Sets". Follow these steps (SHOW and NEXT refer to the buttons next to the triangles that appear on the right hand column of buttons on your phone when you enter programming. Programming must be done from a system phone that has three "soft keys" under the display)
1. At “Terminals & Sets” press NEXT until the display reads “System programming”.
2. Press SHOW. The display reads “Hunt Groups”. Press NEXT twice.
3. The display reads “Featr settings”. Press SHOW. Then press NEXT until the display reads “Set relocation:?”. Use CHANGE to toggle Y to move phones, N to turn feature off. Exit programming.
4. Unplug the phone(s) you want to move. Unplug a maximum of two at a time. Plug in the first set you unplugged at the new location. Wait five minutes for the set to “read” its new location, then press Feature *0, and press an intercom button. The display will show the extension number and name. If correct, you may now plug the other phone in to its new location. Wait five minutes to check the status using Feature *0. Deactivate Set Relocation after moving phones.
If you have old programming, when you use feature ** 266344 266344, you'll see "a.Configuration". If that is the case:
1. Enter into programming by pressing Feature **266344 266344
2. The display will say “A. Configuration”.
3. Press SHOW. The display reads “1. Line Data”
4. Press NEXT three times. The display reads “4. Miscellaneous”
5. Press SHOW. The display reads “Background music”
6. Press NEXT seven times. The display reads “Set relocation: N”
7. Press the soft key under CHANGE to Y(es)
8. Press Rls to finish.
9. Unplug the phone you want to move. At the new location, unplug the second set if needed. Unplug a maximum of two at a time. Plug in the first set you unplugged at the new location. Wait five minutes for the set to “read” its new location, then press Feature *0, and press an intercom button. The display will show the extension number and name. If correct, you may now plug the other phone in to its new location. Wait five minutes to check the status using Feature *0. Deactivate Set Relocation after moving phones.