Benutzer:Soeren/Phonesystem2012

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The current phone system uses two Fritz Fon 7150 Boxes, which are directly connected to the external ISDN bus and act as DECT base stations for the various DECT/GAP handsets in the Labor:

-- UK0 -- NTBA -- ISDN S0 --+---+
                            |   `- Fritz!Fon 7150 --> DECT (cell #0)
                            `----- Fritz!Fon 7150 --> DECT (cell #1)

Due to the nature of the S0 bus, calls may not be transferred from one device to another without occupying the bus (thus blocking it for incoming calls). For this reason, both base stations are connected via ethernet. One of the 7150 boxes also hosts a SIP server (dtmfbox), while the other Box registers to it - this way the amount of internal and/or conference calls is no longer limited by the capabilites of the ISDN S0 bus.