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System and method for implementing short message service extension phones within a radio telecommunications network

  • US 5,806,000 A
  • Filed: 10/12/1995
  • Issued: 09/08/1998
  • Est. Priority Date: 10/12/1995
  • Status: Expired due to Term
First Claim
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1. A mobile telecommunication extension phone system having a gateway mobile switching center (G-MSC), a home location register (HLR), and a plurality of mobile switching centers (MSCs), said system comprising:

  • a plurality of intelligent terminals, each one of said plurality of intelligent terminals being assigned an individual directory number for receiving individual calls and a single common pilot directory number (PDN) for receiving extension phone calls;

    means for transmitting a real-time short message service (SMS) message from said HLR to each of said plurality of intelligent terminals, said SMS message identifying as an extension phone call, an incoming call in the G-MSC which is directed to the PDN;

    means for receiving in the HLR, a return real-time SMS message from at least one responding terminal of said plurality of intelligent terminals, said return SMS message including an indication of the availability of the responding terminal to receive the extension phone call; and

    means for selectively routing the incoming call directed to said PDN to one of the available responding intelligent terminals that transmitted a return SMS message to said HLR.

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