File formatting specs are noted in your system manual or can be ascertained from your system provider. If you can provide us with the specific make and model, our producers will be able to determine the format required.
If they are calling without an expectation that you always pick up (such as if you are a business coach or a one-man shop) then thanking them for calling might make the most sense.

5. "Hello, [Person's name] is chasing new adventures and is no longer with [Company name]. Please forward all future requests to [New or interim person's name] at [phone number]. Thank you!"
Solution: Make it easier for callers to reach a real person. For example, if you have multiple phone lines, Spectrum Business Voice offers you the option of setting up an auto-attendant that answers your business phone and provides callers with a menu of options—such as particular employees or departments. This way, callers are more likely to reach the people who can help them. A hunt group is another voicemail feature: If one employee does not answer their phone, it redirects calls to another phone line in your business and can keep trying all the lines you have. It will only direct calls to voicemail if no one answers their line.