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Monitor voicemail status on an IP phone

Last updated: 2026-06-18

The Message Waiting Indicator (MWI) lights up a lamp — or a screen icon — on a desk phone whenever the linked mailbox has unread messages.

Own mailbox

Provisioned phones light up automatically when the extension's voicemail has new messages. No extra configuration needed.

Watching another mailbox (BLF)

  1. 1

    Open the auto-provisioning template

    Go to Auto Provisioning → Templates → <model>.

  2. 2

    Add a BLF key

    Set the function to BLF, value to vmexten:<extension number> (or the group voicemail number).

  3. 3

    Push to the phone

    Save, select the phone, and click Update Config. The lamp lights when the watched mailbox has new voicemail.