| 单词 | international callback |
| 释义 | international callbackinternational callbackThe practice of circumventing the high cost of international toll calls by mixing conferencing with special signaling to allow an overseas call to be placed via a U.S. dialtone at much lower rates. More common in the 1990s, but less so now, it let someone overseas dial as if that call were originating in the U.S. |
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