dial tone
noun
- dialling tone, sound made after dialing on telephone
Wiktionary
noun
- A telephony signal, usually in the form of a sound, used to indicate that the telephone exchange is working, has recognized an off-hook, and is ready to accept a call.
“Are we jaded? Has living with AIDS become no big deal? Has AIDS had its "15 minutes?" We're over it. Goodbye. Click. Dial tone.”