Subscriber access network, exchange, service control point, and

Telephonic communications – Plural exchange network or interconnection – With interexchange network routing

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379207, 379230, H04M 700

Patent

active

061608823

ABSTRACT:
To establish a connection to a terminal (TE5) of a subscriber access network (AN), a connection request directed to the terminal and containing a public number (CN) corresponding to the number of the terminal in a first public numbering range is routed to a switching unit (SSP, SCP) of the subscriber access network. From the public number (CN), the switching unit (SSP, SCP) determines that of two or more private branch exchanges (PABX1 to PABX3) of the subscriber access network in whose private numbering range the public number (CN) is assigned to the terminal (TE5) as an extension number. The switching unit (SSP, SCP) forms a virtual number (CVN) from the public number (CN) and an identification assigned to the determined private branch exchange (PABX2), and enters this virtual number (CVN) in the connection request. The connection request with this virtual number is then routed to the determined private branch exchange (PABX2) to initiate the establishment of the connection to the terminal.

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"Mobilitat in privaten Telekommunikationsnetzwerken (PTN)" by Cabestre et al, pp. 14-20 Das technische Magazin von Ascom. In: tec Mar. 1995. No Translation.
Implementation of UPT--Universal Personal Telecommunication by Wallinder. In: Ericsson Review, No. 1, 1994--pp. 40-48.
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"Virtual Private Network Call Processing in the Intelligent Network" by Atoui, Discovering a New World of Communications, Jun. 14-18, 1992 Chicago, pp. 561-565.

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