This is it. If you are not satisfied with the custom voicemail greeting, then follow the same steps and do it again.
Education Details: Answering Machine Demo. There is the only Answering Machine for Android that REALY TALKS to the line during a phone call. You can take incoming calls, record voice messages, enter tone dialing, and answer all of this with pre-recorded voice phrases or beeps using Java script program. Demo - A classic telephone answering machine with ready-made

Most callers expect their call to be answered. Once they realize that your office is currently closed, the most important piece of information they probably want to know is your standard business hours.
Before you even begin to draft and implement business voicemail greetings, your pain points need to be identified. For example, if you’re upset that clients aren’t leaving enough context on a voicemail, make sure you’re clearly stating what needs to be in the voicemail. If your clients are unfamiliar with how your business operates and keeps calling during off-hours, identify what time is best to call and say you’ll respond to messages first thing in the morning.