Answerphone pickups are recorded as regular (person) pickups at the exchange. How can automated calls know when to start playing their message when an answerphone picks up?
Here’s a scenario:
1. An automated call comes from your doctor/orthodontist/dentist/etc. to remind you of an appointment.
2. Your answerphone picks up and plays its outgoing greeting.
3. When the greeting ends, the script plays its message and then hangs up.
As some greetings have silence at the beginning (for a fax machine to know if it’s fax or voice) how can automated calls know whether the answerphone starts recording?