Multi-box Voicemail is where you can set up a phone number with branches or extensions, accessible by pressing touchtones. Multi-box Voicemail is typically used by businesses that need a mailbox extension for each employee or in a big house where there's lots of family members or roommates.
Lets look at a few imaginary examples below that graphically illustrate multi-box accounts.
Each mailbox in a multi-box account can hold 100 messages, each message can be up to seven minutes long, and 60 day retention is permitted.