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, but by the capabilities of the DECT base station (which supports 2 voice channels at a time).

Cells

Both base stations are located near the stairs to the basement, so they (should) cover the entire Labor. The Handsets in the basement and lecture room are registered to station 0, while lounge, kitchen and workshop room are connected to cell 1.

VOIP service

As mentioned above, the boxes are connected to one another via SIP. Incoming calls on the ISDN line are never forwarded, unless a user on a DECT handset forwards them to another subscriber - in that case, the call is forwarded via SIP to destination.

Planned Services

• Port the Asterisk-phone-reminder to dtmfbox
• external VOIP connectivity (if internal resources allow)