Phone System 2

This article is just a stub at the moment, rather a scratchpad for ideas ;-)

Topology

--- ISDN --- Fritz!Box --- DECT Handsets / Repeaters
                 |
            SIP Server --- User handsets

Features

• Every (smarphone-)user can register their account at a (LAN-only) website
• SIP Client + Smartphone = Free (landline) calls via the Labor phone system
• Inbound calls to specific users via Menu / special number
• Automatic deletion for inactive accounts after 24 months
• Announcements to all rooms (speakers) via internal number