Yes, they are based on the medium of human voice. Services such as telephones, calling card telephones, cellular phones, cordless phones are this type.

这类业务是以讲话的声音为媒介的，包括电话、磁卡电话、移动电话、无绳电话。

youdao

With the popularization of cars, there is a great demand for car telephones. But most mobile telephones don't have the function of off-hook, so it's very meaningful to develop a kind of car telephone.

当今随着汽车的日益普及，人们在驾驶中使用手机免提的需求也日益增强，但是绝大多数手机并不具备免提功能，因此开发一套车载手机免提系统非常有意义。

youdao

During his lifetime, he invented hundreds of devices that were used in telephones, shortwave radio broadcasts, and similar technology.

VOA: special.2010.01.31

Until the teens, telephones were very expensive because they didn't have good amplification technology.

在20年代之前,电话还是奢侈品,因为它们还没有增强讯号技术

耶鲁公开课 - 金融市场课程节选

They didn't have telephones; they used to have runners.

过去没有电话,只有跑腿的

耶鲁公开课 - 金融市场课程节选

Again, Mr. Jordan telephones Lewinsky -- telephones Lewinsky -- about the draft affidavit.

CNN

At 8:56 a.m. the president telephones Jordan, going on down to 10:56 a.m. the president telephones Jordan at his office.

CNN

And then at 4:19 -- presumably, this is in response to some of the calls by Mr. Jordan earlier in the day -- the president telephones Mr. Jordan, and they have a discussion, and then Mr. Jordan telephones Mr. Carter, and the conversations go back and forth.

CNN