English translation for "number unobtainable tone"

被叫用户占线忙音，空号音
空号音

Related Translations:

unobtainable:  难获得的

unobtainable tone:  空号音

number unobtainable:  电话不能接通

number unobtainable trunk:  空号中继线

number unobtainable signal:  空号信号

number unobtainable connection:  空号接续

dark tone:  深调

answer tone:  应答音

gold toning:  金调色

signal tone:  信号音振铃音

Similar Words：

"number two station" English translation, "number twos" English translation, "number unobtainable" English translation, "number unobtainable connection" English translation, "number unobtainable signal" English translation, "number unobtainable trunk" English translation, "number up" English translation, "number user" English translation, "number value" English translation, "number variable" English translation