Let’s use Flyingvoice G801 as an example, to describe the MWI function.

 

By default, MWI is enabled, please go to SIP Account-->Line 1 page, Supplementary Service Subscription column to check.

If someone leaves you a message, when you pick up the handset, there will be special tone to remind user 

that there is a new message, the tone will lasts about 5 seconds, and then G801 broadcasts the dial tone. User dials the voicemail box number, then can listen to the message. User can also fill in the voice mailbox 

numbers.

When enable MWI, user can check if there is a waiting message by picking up the handset to check the tone.