What is the name of the noise reduction function when the interlocutor is silent?

Question

Telephony

Good day. Grandstream GXP1620 phone, when the interlocutor is silent, the background noise from the handset immediately disappears, there is a feeling that the connection is lost. What is the name of this function, I can not find it in the settings to disable it?

Answer 1

silence suppression
in Grandstream must be disabled Voice Activity Detection (VAD)

Answer 2

The feature is called Comfort Noise Generation. Should be enabled, not disabled