An internal voicemail greeting is used to greet people who call you from within your own company, such as from another extension within your company and its internal phone system.
If needed, you have the option to send voicemails via email automatically. Besides, there is also an option to create greetings for your callers.

On hold messages can be recorded for many purposes, such as promoting your business, answering FAQs or announcing important customer service information. It's important to be clear in the message you are trying to get across. Confusion leads to disengagement and reflects badly on the brand. Determining your callers' wait times is necessary to determine the required length of the on-hold message. Making the recording too short can lead to the message being played too many times. This can be repetitive and lose the caller's attention while they hold.
Business owners and everyday customers know that there will be times — like the holidays — when things get busy. When you’re transparent about why you weren’t able to come to the phone, people typically understand and are much more willing to be patient with your business. If the goal is to encourage more people to leave a voicemail, your greetings have to be actionable and clearly dictate what you want the caller to do. Having a caller go to voicemail is not the end of the world; it’s going to happen, so you have to make the most of it.