Voicemail is generally enabled for a User or a Team. However, if you wish to have specific voicemail settings for an individual number you can follow this guide.
To do this you need to assign a number to a team and with each team you can record a voicemail for when calls aren't answered or when you are out of hours.
Here are the steps to follow:
1) Add a Team
- Go to settings
- Add Team+
- Name it
- Add any Users (yourself)
- Set Out of Hours
Change the Call settings to appropriate voicemail requirements
2) Edit Number
- Go to numbers (under the administrator heading)
- Click on your number
- Assign it to your new team
Repeat this process for each number you want a different voicemail for.