The dutch VoIP company "Budget Phone Company" has recently announced a new (beta) SIP server on their network.
They say it's call quality is better compared to their current production server, and that it allows users to make use of more services, such as a more advanced voicemail service.
Please see the following forum post for more information on how to make use of their new server.
Budget Phone VOIP Gebruikers Forum :: Bekijk onderwerp - Wie doet er mee? (dutch)