In Engpsh, a telephone ringtone or ringback tone is often referred to as a "ring tone." A "ringback tone" is a sound that is played to the caller when the call is being connected. It is called a "ringback" because it is intended to inform the caller that the phone on the other end is ringing, and the call is being connected.
The sound that is played to the person who is receiving the call is often referred to as a "ring tone." This can be a pre-selected sound that is stored on the phone, or it can be a custom ringtone that has been created or downloaded by the user.
So to summarize, a telephone ringtone or ringback tone can be referred to as a "ring tone" in Engpsh.