Small Telephone Network With Peer-to-Peer

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Siemens has developed a telephone system that doesn't require a
switchboard. The HiPath BizIP telephones are directly connected to one
another and communicate much like participants in an Internet
file-sharing service (peer-to-peer, P2P), where computers exchange data
without detours through a central server. Designed for up to 16
telephones, the solution is intended primarily for small companies and
will make costly installations and maintenance work on telephone
systems a thing of the past.

http://technology-post.com/tech/?p=650