My company got a
Norstar Business Phone System from a company named
Business Phones Direct, it cost about $550, which as far as I understand is rather inexpensive for a system.
I do IT for a smaller company so by default I got stuck programming the phones when we added two more to the system, the company we bought it from took the time to walk me through it and it was extremely easy, a month later we added one more phone and I did it myself, the display prompts you for everything but my boss was impressed. Overall we love the system and I personally couldnt have been more pleased with the vendor.
From my understanding a PBX system is used in LARGE enviornments, where there are a hundred or more users, and generally these systems cost $200 per phone or so, whereas a key phone system, the type we got, is used for smaller enviornments. They can grow out to two hundred phones or so, but generally they are meant to be used with a smaller number of users.
Music on Hold on our system is provided by a cd player, which plug into the system via its headset jack. We dont have voicemail, as we lease it from the phone company for a couple bucks per mailbox a month - I almost got my boss to splurge for a voicemail that would connect to our network but we really dont have enough employees to justify the cost.
Transfer and paging, from what I understand, are standard features on a key system.
Just for reference the one we got is a
308 phone system which means 3 lines by 8 phones max, but I believe they sold much larger ones.