https://trio.ad.kth.se/pow/or via dialling to extension 7000, the pin-code is initially the same as your extension number. You will also get a message box that people can leave voice messages in.
A WORKAROUND for HVD between ip phones: you can use the [CFwdAll] soft button to forward
your calls to 7000 after you setup your info in the HVD. You have to remember to remove the
referral BOTH in the HVD and to remove the [CFwdAll] on the phone to be able to receive calls again.