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Telecommunications network with relocateability of subscriber number
| Details |
Inventors: Kallioniemi, Karl-Erik; Kilhage, Per-Erik Mikael; Olsson, Bjorn; Larsson, Mikael;
Assignee: Telefonaktiebolaget LM Ericsson (Stockholm, SE)
Primary Examiner: Wolinsky; Scott
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye, P.C.
A telecommunications domain (20) having subscriber number relocateablity includes a plurality of physical nodes or exchanges (22) between which calls are connected and a subscriber location server (30) which is connected to and accessed by each of the plurality of exchanges (22) in the domain (20). Each exchange (22) has a unique exchange identifier (ID). Generally, when a call is placed to a subscriber in the relocateability domain, a first exchange the call encounters in the domain queries the subscriber location server. When queried, the subscriber location server (30) returns a Network Routing Number (NRN) which includes a Network Routing Prefix (NRP). The Network Routing Prefix (NRP) is a node identifier (NI) for the local exchange to which the called party is connected. The exchange (22) to which the NRN is returned prepares a routing message for the call by including the Network Routing Prefix (NRP) in an Address Signal Field (ASF) of a routing message and by setting a number relocateability flag (NRF) in the routing message. Using the NRP of the routing message, the call is routed to the called party exchange (i.e., the terminating exchange). In the called party exchange, the exchange identifier is recognized as its "own" and thereafter the rest of the Address Signal Field (ASF) is analyzed to identify the called subscriber line. |
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DETAILED DESCRIPTION The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1.
A telecommunications system having subscriber number relocateablity, the system comprising: a plurality of exchanges between which calls are connected; and a subscriber location server accessed by the plurality of exchanges, for each of a plurality of subscribers the subscriber location server having a changeable mapping of a subscriber number and a network routing prefix; the plurality of exchanges being connected to subscribers and to the subscriber location server whereby, as a calling subscriber initiates a call, a called subscriber number is forwarded to the subscriber location server, whereupon the subscriber location server determines the network routing prefix for the called subscriber number and transmits the network routing prefix to an exchange connected to the calling subscriber, and whereby a concatenation of the network routing prefix and the called subscriber number replaces an address signal field of a called party parameter such that the call can be routed.
2.
The system of claim 1, wherein a change of connection of the called subscriber from a first exchange to a second exchange involves a remapping in the subscriber location server of the called subscriber number from a network routing prefix of the first exchange to a network routing prefix of the second exchange.
3.
The system of claim 1, wherein the exchange which routes the call includes the concatenation of the network routing pefix and the called subscriber number in an industry standard routing message.
4.
The systcn of claim 3, wherein the exchange which routes the call includes the concatenation of the network routing prefix and the called subscriber number in the address signal field of the called party number parameter.
5.
The system of claim 4, wherein the network routing prefix comprises an exchange identifier of an exchange to which the called subscriber is connected.
6.
The system of claim 4, wherein the exchange which routes the call includes a telephone resource number identifier in the address signal field of the called party number pararmeter
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