The only way to program offline is to use a second system. The offline program is not up to date for 3.5.

I don't know what the config of your present system is but if you have no voip ports working with it you will not have to do much programming if any to get the pri to come up, after you program the logical config.
The system will add the PRI trunks to the analog ones that are still active. So if you have 12 active analogs the PRI trunks are going to start at 13. Make sure enblock send is turned on for any Pri trunks in ISDN attributes 1. The system can have 36 trunks total. You will need loop keys on the phones to call out. Park buttons are good, get rid of any line appearances, they are not going to help much. Good Luck

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