And without the dial tone, how will movie producers ever indicate that someone's hung up on a character?
没有了它，电影制作者要怎么表现某人挂断另一个人电话呢？
Like many other developers with a history in telecom, I learned that when you build a telephone switch, regulations say it must provide dial tone in 40ms, a difficult requirement to achieve.
像许多常年混迹于电信行业中的开发人员一样，我所学习到的是，若实现一个电话交换，则一定要在40毫秒内发出拨号音，这是一个难以实现的需求。
DORIS: Really? I had no idea. Let me check. Yes, it's dead. There's no dial tone.
朵丽丝：真的？我一点都不知道，我来查查看。是的，它毫无声响，没有拨号音。
There is no dial tone. Make sure your phone line is properly connected to the modem.
没有拨号音。请确定电话线已正确连接到调制解调器上。
No dial tone. Make sure the modem is correctly connected to the computer and phone line.
无拨号音。请确保调制解调器与计算机和电话线连接正确。
If you don't hear a dial tone, your organization or telephone might not support this type of outside call, or might require an additional access code.
如果未听到拨号音，表明您所在单位或您的电话可能不支持这种对外呼叫类型，或需要额外的访问号码。
This article examines the lessons learned from the commercial deployment of a switched fiber-coax video dial tone network in Dover Township, New Jersey, USA.
文章主要就美国新泽西州多佛城推行的光纤-同轴电缆视频拨号交换网商用中所取得的经验教训作了分析和研究。
From a corner pay-call, you pick up the phone, listen for a dial tone (a buzzing sound), deposits a coin or COINS (depending on the cost in the area) and then dial the number.
在街角的付费电话亭，你拿起电话，听到拨号声音(嗡嗡声)，投入硬币(数量视地区而定)，然后拨号。
The filter section uses switched capacitor techniques for high-and low-group filters and dial-tone rejection.
在滤波部分，高组滤波和拨号音频滤波等使用了开关电容技术。
The filter section uses switched capacitor techniques for high-and low-group filters and dial-tone rejection.
在滤波部分，高组滤波和拨号音频滤波等使用了开关电容技术。
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