How do your phones handle voicemail indicators and message waiting lights in different PBX environments?

Our phones for hotel rooms are chosen for broad compatibility with common hotel PBX and hosted systems used across the UK. Message waiting lights and voicemail indicators can usually be driven using industry-standard signalling methods, so when a guest receives a voicemail, the handset will show a clear light or icon. During installation, your telecom provider will pair the phones with your PBX settings, so indicators clear automatically once messages are retrieved.