I have no idea about Conference call but my friend told me that it is good service. According to her it is cheaper compare to others and she enjoys a lot. The features are great. You can make it mute and un mute, volume control, roll call, lock conference, turn on security, record the call and hold a sub conference. She encouraged me to sign up but I can not decide yet. Maybe I will try soon and if I like it I will sign up immediately.