Much better & simpler method: simply phone your own voicemail service. Then one of the options will be to ‘record a voicemail’; after which you can enter the phone number, record & send voicemail.
Voicemail is necessary when no one can answer the phone. However, a dedicated receptionist can reduce the need for this feature and help people reach a live person. Consider live chat as well if your customers like to reach out online.

This call may be recorded or monitored for quality and training purposes. If you don’t wish this call to be monitored or recorded, then please let the answering machine know when you leave your message.
A good voicemail greeting is short and professional, lets people know that you’ll get back to them, and invites callers to continue engaging with a call-to-action. You should also show your personality if you’re in an industry or role that allows that. If your industry is more conservative, however, you’ll want to keep humor and personal touches to a minimum. A greeting Your name Your company A simple explanation for missing the call (e.g. you’re away from the phone or are on holiday) A rough estimate of when you’ll get back to the person An alternative person to reach out to (if you’re out of office) An alternative mode of communication (if you prefer email or text) A call-to-action such as “Leave a message” or “Send me an email at [email protected]”