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.
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.
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