Well, the discussion has come up again with a bit more serious dedication to getting it moving. We have an old OPT81 (Release 4 ver 3321) approx. 500 sets, as well as a small Opt 11 at another site with about 120 sets. Luckily no call center to support! I know we have a bunch of network upgrades to do first - upgrades of all switches and things. That will be the first part for sure. Then I need to see what we physically need to start transitioning from the PBX to the new system...? I guess this is where I need advice on what would make the transition easiest? I can't say for certain that we will not have a hosted system, but I seriously doubt that will be the case, as there are very big security concerns due to the nature of our business. SO - I imagine it will have to be a server parked here on site. What brands of systems seem to integrate well with Nortel systems? What are the pitfalls I need to watch out for? Any advice is appreciated.....