（Call tear down）：如果主叫用户首先挂断电话，源交换机会发送一个 ISUP 释放信息 （REL：release message）以解除交换机间的中继电路。
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call tear down
呼唤拆毁
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"After last week's defeats, the Obama campaign faced a choice: try to convince voters that Senator Obama is ready to take the 3 a.m. phone call in a positive way or try to tear down Senator Clinton's accomplishments, " the Clinton memo also stated.
CNN: Obama camp questions Clinton's readiness to lead
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