The word “Ringback” is perhaps unfairly associated with a niche market of cell phone users. A ringback tone is a signaling tone that the caller hears while the phone is ringing. In America, the tradition has been to have a two second tone with a four second pause, mirroring the two second ring and four second pauses on the other end.
If it is a genre, hold music, it's fair to say, is a troubled one with few hits. It's not really meant to be loved or even listened to — it's meant to communicate something specific: Don't hang up. (Cornell makes this plea specifically at the end of his song.) Silence is believed to be a death knell for phone calls — people will simply think the line is dead and hang up. This is true even on non-hold calls; it's why phone companies transmit something called a "comfort tone" over phone lines, a barely audible synthetic noise that signals a connection is still there.

Website: https://www.tunepocket.com/best-on-hold-music/#:~:text=Here are 3 simple tips to help you,to the lower bandwidth of the phone line.
4.) Todos nuestros miembros del equipo está ocupados con otros clientes. Le rogamos que tenga paciencia, le atenderemos en seguida. -PAUSA- Lo sentimos, todos nuestros empleados están ocupados. Por favor, manténgase a la espera. Si lo desea también puede enviarnos un correo electrónico a [email protected]. Le devolveremos la llamada lo antes posible.