digital subscriber line.
数字用户专线
long distance subscriber line
远距离用户线
consumer digital subscriber line
家用数字用户线
automatic subscriber line testing equipm
用户线自动测试设备
It may not be the same as an access line or a subscriber.
但不同于一个接入线或者一个用户。
Automatic completion of calls to busy subscriber when the called line becomes free.
在被叫号码空闲时自动完成到达占线用户的呼叫。
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