I've just joined a new office and am trying to retrieve voicemails on the handset (specs in title). It seems to be set up to do this but I don't know the PIN associated with the account. There's no record of it in the office and the boss doesn't know it. How do I reset it or is there a factory default PIN I can try? The issue seems to be at the BT service package end rather than the handset settings.
All information I can find online seems to relate only to setting the handset up, not resolving a lost PIN for a BT account.