1571 Voicemail

[#1]

I received an email yesterday from PN to say I was put on the wrong 1571 package when last year when I moved my home phone and PN will change it in 2 weeks to the correct one. I'm not bothered as long as callers can leave messages but I wasn't aware there is more than one type of 1571 package.
Anyone know the differences?

[#2]

Basic Voicemail is provided as default on new lines, but can be disabled. It's free.
Voicemail Extra (Callminder in BT-speak) is £3/month and has extra facilities like changing the number of rings before answer and linking to a mobile.