When your small business is closed, ensure that your callers know that! If appropriate, you might want to reiterate your business hours to manage callback expectations.
When you frequently update your business greeting, there is a chance more people will listen to the message. You can update your voicemail with relevant information about your business as a way to keep your customers well informed.

How to Make Great Answering Machine Messages. Voicemail greetings should be professional, but depending on you, the company you’re with or own, and the situation, the structure may vary. There are a few different considerations to keep in mind when you’re thinking about and recording your voicemail greeting. Don’t be generic.
Twilio is a low-cost cloud service that provides APIs that add communication services to applications. We bought our phone number, which costs $1.00 per month, even if we don’t use for any calls or messages. Twilio charges $0.085 a minute for incoming calls and $0.013 a minute for outgoing calls. Sending or receiving a text message from our Twilio number costs $0.0075, while recording a voicemail is only $0.0025. Even if we receive 100 messages a month, the cost of those, plus the phone number, is only two or three dollars. To increase the security of this task, it might be a good idea to consider a proxy server from companies similar to fineproxy. The last thing you’d want is to get hacked! But I digress.