Do they want to sit through an IVR menu that may or may not direct them to the right person? Do they know you’re a one-man/woman team and there’s no reason to sit through a menu? Skip the menu entirely and let them leave a message as quickly as possible. There’s no reason to add any additional steps or make your customers go through leaps and hurdles to leave a simple voicemail. When you identify what your customers’ pain points are, you make it much easier to determine what you want them to do to save everyone from the unnecessary stress.
In order to determine the number of users you need for your Alliance Phones phone system, count the total number of devices you need, including desk phones, softphones, conference phones, and fax machines.

However, a little further down the road is ubiquitous 5G. When that happens several VoIP vendors seem bent on simply connecting their service to 5G so workers will be able to access their business VoIP service wherever they are and across any device as long as it's 5G compatible. While some vendors do this with current mobile technology, the latency limits around 4G calling often make it a sub-optimal experience, not just for video and collaboration, but often simple voice traffic, too. 5G is the first service that promises the bandwidth necessary to make true mobile UC a reality.
A formal voicemail greeting is one with a professional tone. It could be for a business or for personal reasons. Formal voicemail greetings are designed to impart a sense of authenticity. They leave the caller with a sense of trust in your abilities, whatever they may be.