Have you ever been stuck on the phone with a parent who talks far too long? Did you really need to hear the entire history of the student's peanut allergy since he was 3?
When you are ready to gracefully end the phone call, play this audio. It is 38 seconds long. For 33 seconds, the parent will hear of noises that students typically make as they enter a classroom. Then, the bell rings for 5 seconds. That's your opportunity to say, "I've so enjoyed speaking with you and I have to start class now. Thank you and goodbye."