Aastra OpenCom 130 User Guide - Page 178
Fixed Mobile Convergence
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Fixed Mobile Convergence 14. 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 communications 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 signalled 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 telephone 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 executed 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. 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 messages). 176