Great question! Although I don’t know if there is a specific function for this on your particular phone, the best way to save the message is the simplest. Turn up the sound as high as you can and record it onto a digital recorder (like you would use for a lecture), a cassette recorder or your cell phone if you have a voice recorder on it. Then save it as an MP3 on to your computer for safe keeping. You can also Google your vtech model number to see if you can find an owner’s manual. They might have a way to save a recording in there. Probably not, but it’s worth a shot.
You'll notice that many of these are targeted, but cover things that can easily annoy users. Slow keyboard response in Quick Reply is one of our frustrations with iOS 9.1 that this fixes. Other upgrades fix alarm bugs, iCloud backup problems and much more.

Our patented technology allows users to WRITE out their greeting script using keywords from their phone’s address book such as ‘FirstName’, ‘LastName’, ‘Number’ and ‘Company’. Once the user writes the greeting text, they choose a Voxist voice that will speak this greeting for them. The greeting they’ve written can apply to one or more callers that they designate.
5-) Bienvenue chez John Doe. Vous pouvez nous contacter du Lundi au vendredi de 7h à 18h et les samedis de 10h à 13h. Si vous voulez passer une commande ou si vous avez une question, laissez-nous votre nom et votre numéro de téléphone. Nous reviendrons vers vous dès que possible. Vous pouvez toujours nous envoyer un email sur [email protected]. Merci beaucoup pour votre appel. Au revoir.