Fixed Mobile Convergence
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Fixed Mobile Convergence
The “Fixed Mobile Convergence” (FMC) feature offers operation of mobile telephones
on the OpenCom 100 communications system. Connections to and from the mobile
telephone are directed via the communications system. This is done by the communi-
cations system managing the mobile telephone as an internal terminal with its own
internal call number. This is how all features of the system telephony can be used on
the mobile telephone. Connection expenses billed on the mobile network are limited
to the connection to the communications system. When the mobile telephone user
establishes an external connection (e. g. an international call) via the communications
system, the expenses for the international call are apportioned to the system.
Of particular interest is parallel operation of a stationary system telephone and a
mobile telephone that can be reached under the same internal call number. There is
no difference in how both terminals can be reached by callers: an incoming call is sig-
nalled on the system telephone and on the mobile telephone at the same time. When
a call is accepted on the mobile telephone, the terminal of the caller does not display
the mobile call number, rather the office call number administered on the
OpenCom 100 communications system is displayed, which can be used to reach the
system telephone as well. It is possible to take an ongoing call from the mobile tele-
phone on the system telephone (and vice versa). System features such as e. g.
enquiries and forwarding are available with calls via the mobile telephone just as with
calls via the system telephone. An outgoing call using the mobile telephone is exe-
cuted via the same call number as a call from the system telephone.
The FMC feature requires no additional hardware. The technical solution comprises
the following:
• Each mobile telephone (= FMC telephone) is assigned an internal call number
which is used for the configured mobile call number. The radio technology of the
mobile network (GSM, UMTS or CDMA) is not relevant.
• A mobile telephone is generally integrated with the communications system via
an ISDN system connection or via a DDI-capable SIP line. An internal FMC call
number is configured for the connection between communications system and
mobile telephone. The FMC call number can be called externally from the mobile
telephone using an ISDN system access. In addition, all calls made to the mobile
telephone are conducted using this FMC call number. A further internal FMC call
number can be additionally configured for transmission of MWI such that the
mobile telephone user can be informed of waiting messages (e. g. voicebox mes-
sages).
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