ET users have requirements that are different from those of the average user on the PSTN. Therefore, ET users have equipment and networks built specifically for those needs. As telecommunications moves to open standards, the alternatives to enterprise customers will grow exponentially.

These alternatives—including packet-based networks for voice and data, integrated access, and much more— will change the way least-cost routing and trunking/busy hour calculations are accomplished.

Figure 2-6. Tie-Line Costs Compared to PSTN Costs

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