I'm not sure if the various Anveo plans work differently, but I am on a "standard" Anveo plan and there is a check box in the Anveo "My Account -> Account preferences -> Sip device registration" web set-up screens that reads "enable MWI". You must make sure the box is checked. Also, Anveo requires that your device register to receive MWI. If your device doesn't register to receive it then Anveo does not send the message. I have an Obi 110 so can't tell you where the setting to register might be in the 1062 phone.