I've been researching a replacement for the company PBX phone system (an old Norstar system). I've come down to two choices. The 3Com NBX v5000 (SuperStacker) and the NEC Elite IPK. I'm leaning towards the 3com, but I have a vendor that is particularly stubborn and keeps insisting the NEC is the better system for our needs. We currently have 80 phones and will be deploying that many with the new system. We have one location, but often have remote jobsite trailers that could take advantage of VoIP benefits. Future growth should be covered by both systems.
Is there anyone out there that is familiar with either of these systems? I'd like to know what some of their shortcomings might be. The NEC guy tells me that the 3Com doesn't use true IP (SIP) technology, but proprietary Ethernet. From my understanding, for LAN operation, the 3Com works on a layer3 level (mac address) and is actually beneficial as it conserves IP addresses.
Any information and opinions will be greatly appreciated.