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Deployment of digital switches as small central offices has proved, in many cases, to be uneconomic due to the high cost of subscriber line circuits and external cable pairs. Conversely, the cost of providing ISDN PRI interfaces is relatively inexpensive. Delivery of the access network by wired or wireless LAN methods resolves this problem.
The iCON central office concentrator provides the interface between the ISDN PRI and the VOIP LAN and enables progressive expansion of local area telephony without the need for expensive 2-wire analogue interfaces. The concentrator also extends features and facilities available at the digital switch to LAN VOIP subscribers and provides these additional features and facilities in cases where the digital switch is not so equipped. Interfaces are E1 ISDN PRI and capacities are up to 240 PRI trunks and 2000 subscribers.