Your voicemail needs to have relevant information such as your name, who the prospects are connecting to, the department you work in, why your not available to assist your prospects, when you will call them and related information, this is what the prospects would prefer hearing instead of dragging the voicemail messages speaking about your brand and more.
While this information can be tucked behind a phone menu option, it's best to state it upfront in your after hours recording. This way, callers can decide whether to call back at a better time, or leave a voicemail message.

Take the time to listen to calls, call back if necessary, use your cell phone when you’re out of town, and take care of anything actionable listed in the messages instead of watching your mailbox fill in. This kind of attention to detail can go a long way towards building a good reputation and image for the business. Good luck! Search
Informal voicemail greetings are those that don’t adhere to the rules of professional and business voicemail greetings. Here, you are free to just leave a simple greeting, or use it to show your more witty side. This style of greetings can be used for both home and business if you like, depending on the type of caller you expect. For instance, a novelty shop could probably create a rather informal message, using sound effects that represent the type of items they sell.