Answer tone

Answer tone is a feature of wireline modems.

It is the tone heard by the caller after dialing the number.

The plain 2100 Hz tone is meant to disable echo suppressors on international trunk connections.

It may include 180° phase reversals at intervals of 450 ms to disable network echo cancellers.

It may also be amplitude modulated by a 15 Hz signal to indicate ITU-T V.8 capability.