While this is in theory possible with traditional telephone networks, access to switching equipment is easier to control.

虽然这对传统电话网络在理论上也有可能，但交换设备更容易保护。

youdao

Instructing the switching network to realize the telephone communication needs much of equipment charges, lines charges, protection charges, project charges and time.

建立程控交换电话网络实现电话通信需要大量的设备费、线路费、维护费和工程费等费用，并且需要一定的施工工期。

youdao

Interestingly, it became clear in 1988 that the Soviets had failed to develop the anticipated indigenous capability to manufacture advanced telephone switching equipment.

CENTERFORSECURITYPOLICY: Center for Security Policy | Alcatel��s Soviet Joint Venture: A Sale The West Cannot Afford To Make

The deal would transform the relatively primitive Soviet telephone network into one utilizing high technology fiber-optic cable and switching equipment.

CENTERFORSECURITYPOLICY: Will The West Upgrade The USSR��s Strategic C3 System?

Huawei also earned headlines for its activities in Afghanistan where it helped the Taliban regime create a telephone switching system in Kabul that the Indian government identified as communications surveillance equipment.

CENTERFORSECURITYPOLICY: Center For Security Policy