[Serusers] account from an end-device

Hello, In the documentation of acc is written: "If a UA fails in middle of conversation, a proxy will never learn it. In general, a better practice is to account from an end-device (such as PSTN gateway), which best knows about call status (including media status and PSTN status in case of the gateway)." Has anyone an idea how to make this? How can I get this informations from a PSTN Gateway? What I want to have is a server on which are connected my "users". A user can enter a "uri". If this uri begins with "sip:00", I want to connect them to a pstn gateway. Thanks! Sebastian -- +++ GMX - die erste Adresse f�r Mail, Message, More +++ 10 GB Mailbox, 100 FreeSMS http://www.gmx.net/de/go/topmail