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@Fa5t3r - I would try a wide range of different tones when recording and play them back to see what goes over the best and what projects the image you want people to hear. Remember that some people may be going to hear this message over and over again depending on how often they have to call you so you want it to be very pleasant and not at all irritating.

How many times have you gone through the following scenario: While working with a customer or engaged on an important call, you receive a new voicemail. You listen to the message, hoping to understand the caller’s name and issue correctly. And when the caller whizzes through the digits of their callback number faster than you can write, you have to go through the entire message again. Once this exercise has been completed, you call the person back, only to get their voicemail.
6.) Hallo und willkommen bei der Mustermann AG - Agentur für Musterartikel. Leider wird gerade auf allen Leitungen gesprochen. Probieren Sie es später noch einmal oder haben Sie einen kleinen Moment Geduld. Vielen Dank, Ihr Mustermann-Team.