Can the landline be monitored?

It is possible, because there is a listening device called mobile phone companion on the market now, and there are also infinite bugs.

Call monitoring is the general name of monitoring equipment and monitoring methods used in mobile phone calls, including monitoring equipment, transmission, confidentiality and processing of monitoring signals, installation and use of monitors, signal interception matching with monitoring, etc. Commonly used in total recall, GPS positioning technology, base station positioning, mobile phone positioning technology.

Mobile phone companion is the most popular mobile phone monitoring software at present, which is mainly used for the safety monitoring and location tracking of relatives (old people and children), allowing you to guard your relatives around the clock through your mobile phone; If the mobile phone is stolen, you can also find the location of the stolen mobile phone and the number of the replaced SIM card at the first time, intercept the thief's short message content and monitor the thief's call record without the thief feeling.

There are two ways to prevent eavesdropping:

First, source encryption

Intelligent voice companion is a good anti-call monitoring device at present, which means that Bluetooth device terminals are introduced at both ends of mobile phone calls at the same time, and safe and reliable anti-channel monitoring is realized through point-to-point voice signal source encryption, that is to say, monitoring channel voice calls, without the encryption key and key of point-to-point devices, voice information cannot be decrypted. The greater the intensity of source encryption, the greater the damage to audio signals, and the more difficult it is to pass through the speech encoders of mobile phone manufacturers. At present, this encryption can not achieve high fidelity of voice calls;

Second, voice scrambling code.

It is a method that audio interference is directly loaded on the voice signal and transmitted to the other end to remove the interference signal and restore the voice signal. This kind of encryption is a voice scrambling code, which is not strong and easy to be cracked, but the fidelity of voice restoration is high, so it is widely used by major manufacturers at present.