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.
But it can also handle other functions, including session setup (initiating a call at the target endpoint—the phone you're calling), presence management (giving an indicator of whether a user is "available," "away," etc.), location management (target registration), call monitoring, and more. Despite all that capability, SIP is simple compared to other VoIP protocols primarily because it's text-based and built on an easy request/response model that's similar in many ways to both HTTP and SMTP. Yet, it's still capable of handling the most complex operations performed by business-grade PBXes.

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Calls to this group would reach Winnie T. Pooh’s phone first before switching to Charlie Chaplin’s phone. When the slider bars overlap in the GIF, this is where the same call would ring both users simultaneously. When the series of calls ends, it can terminate at a voicemail box of your choosing. Because Winnie T. Pooh would be the department lead in this situation, the caller would ultimately reach his voicemail if neither individual in the group answered their phones.