disadvantages are the ability to scale the system and a dial tone that's dependent on NT, which doesn't offer the same uptime as a switched phone network. Until recently IP PBXs have been targeted at offices with 100 users or less, but Alcatel recently announced a system that incorporates gateway and call processing in a single device and can accommodate up to 50,000 users. 3Com, Lucent and Cisco have all announced Penacook 56k , Penacook, NH 56k PenacookPenacook , 56k New Hampshire, Penacook 56k
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