例如，许多呼叫中心使用互联网语音技术，与高质量的电话线相比，能以更低成本运营国际长途电话业务。
Many call centres, for instance, use voice-over-internet technology so that international calls can be handled more cheaply than with high-quality voice lines.
当一个呼叫中心忙时，你可以通知长途电话公司将所有的800呼入电话转移到另一个空闲的呼叫中心。
When one gets busy, you may tell your long distance company to route all the 800 inbound phone calls to the call center, which isn't busy.
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