Enhanced Voicemail lets you listen to messages, create personal or corporate greetings and access your voicemail box from anywhere there's phone or internet access. In the Optimum Business Account Center, you can manage many advanced voicemail features, including listening to messages online, setting voicemail alerts and sending your messages to your email account. To activate your voicemail box you can simply dial *86 from your Optimum Voice line and follow the voice prompts or log in to the Optimum Business Account Center, click the "Phone" tab and select "Voicemail" from the drop-down menu. Here you will find the complete instruction guide to activate and manage your voicemail online or via telephone.
6.) Bonjour et bienvenue chez l’AG de John Doe – Agence d’échantillons de produit. Malheureusement, toutes nos lignes sont occupées en ce moment. Réessayez plus tard ou restez en ligne. Merci, votre équipe John Doe.

You can also set the voicemail greeting for Call Queues and Ring Groups in 8x8 Admin Console by following the same steps - just edit the relevant Ring Group or Call Queue and follow from step 5.
While missed calls aren’t ideal, you can let your caller know you’re still there for them by having a great voicemail greeting. The best business voicemail greetings let your customers (and potential customers) know why you’re not available and how they can best get in contact with your business. They are also short and to the point. You usually want to keep your greeting between 6 and 24 seconds long so callers don’t hang up halfway through.