Disclosed in the present invention are a method, a device and a system for controlling a call. Said method comprises: a second terminal establishing, by means of a VoLTE function, a call connection with a third terminal; the second terminal establishing, by means of the VoLTE function, a call connection with a first terminal; the second terminal sending, when a sending condition is satisfied, collected second audio information to the first terminal and the third terminal; the second terminal serving, when a first forwarding condition is satisfied, as a relay node to forward first audio information received from the first terminal to the third terminal, or when a second forwarding condition is satisfied, the second terminal forwarding third audio information received from the third terminal to the first terminal. By means of said method, the first terminal can be dialed or answered when the second terminal is in a call state, thereby realizing a simultaneous online call of multiple people.