Process and system for automatic routing

• US 6,285,879 B1
• Filed: 01/15/1999
• Issued: 09/04/2001
• Est. Priority Date: 07/26/1996
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Weiler, Dirk, Lechner, Gerhard, Schöttle, Eckard, Rau, Helmut
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US09/214,985
• Time in Patent Office: 963 Days
• Field of Search: 455/432, 455/433, 455/436, 455/445, 455/554, 455/555, 455/560, 379/210, 379/211, 379/212
• US Class Current: 455/432.3
• CPC Class Codes: H04Q 2213/13097 Numbering, addressing
• CPC Class Codes: H04Q 2213/13098 Mobile subscriber
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13141 Hunting for free outlet, circuit or channel
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13384 Inter-PBX traffic, PBX networks, e.g. corporate networks
• CPC Class Codes: H04Q 3/62 for connecting to private branch exchanges
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

In accord therewith, at least one identification number (PIID) for identifying a private network (PISN) for access to a first private branch exchange (PBX1) to a subscriber (BS) who was registered and a mobile subscriber telephone number (MSISDN) that was sent into the public mobile radio telephone network (PLMN), is stored in the public mobile radio telephone network (PLMN). A routing number (PRIN) is offered in the mobile radio telephone network on the basis of the incoming mobile subscriber telephone number (MSISDN) and is checked with reference to the stored identification number (PIID) as to whether the call destination lies in the area of a private branch exchange (PBX2) of the same private network (PISN) to which the first private branch exchange (PBX1) belongs. When this is the case, routing information (RIN) that define the call destination are sent—after clear down of the call in the public mobile radio telephone network—to the first private branch exchange (PBX1) that subsequently sets up the connection to the call destination in the private network (PISN) on the basis of the received routing information (RIN).

Claims

1. A method for routing in a connection setup for calls between a first subscriber and a second subscriber, comprising the steps of:

initiating a call by the first subscriber by selecting a telephone number and directing the call to the second subscriber who moves between coverage areas of mobile switching centers of a public mobile radio telephone network and areas of private branch exchanges of at least one private network and who uses at least one radio telephone subscriber station for receiving and transmitting calls;

setting up a connection to a first private branch exchange of the private network based on the selected telephone number and transmitting a mobile radio telephone subscriber telephone number from the private branch exchange to the public mobile radio telephone network;

storing at least one identification number for identification of the private network in the public mobile radio telephone network for access to the first private branch exchange;

compiling a routing number in the public mobile radio telephone network based on the arriving mobile radio telephone subscriber telephone number and checking the routing number with reference to the stored identification number to determine if a call destination lies in an area of a private branch exchange of the same private network to which the first private branch exchange belongs; and

sending given identity of the private network for the first private exchange and for the private branch exchange of the call destination, the call, if cleared down in the public mobile radio telephone network, and sending routing information that define the call destination to the first private branch exchange of the private network, the connection to the call destination in the private network being set up based on said routing information.

2. The method according to claim 1, wherein the routing number has at least an identification number for identification of the private network in which the private branch exchange of the call destination lies.

3. The method according to claim 2, wherein the routing number additionally has an identification number for identification of the private branch exchange of the call destination and an identification number for identifying the connection part of the private branch exchange.

4. The method according to claim 1, wherein the routing information has an identification number for identifying the private branch exchange of the call destination and an identification number for identifying a connection port of the private branch exchange of the call destination.

5. The method according to claim 1, wherein location information that indicates how the subscriber is reachable in an area of a private branch exchange of the private network is stored in the public mobile radio telephone network for the called subscribed and is employed as routing number for a comparison to the stored identification number with respect to identity of the private network for the first private branch exchange and for the private branch exchange registering the called subscriber.

6. The method according to claim 1, wherein, due to a call forwarding that is respectively set for the call subscriber and defines a call destination in the private network, the routing number is employed for a comparison to the stored identification number in view of identity of the private network for the first private branch exchange and for the private branch exchange of the call destination.

7. The method according to claim 6, wherein, due to an unconditional call forwarding that effects an immediate forwarding of the call or due to a call forwarding given an unreachable subscriber the routing number is employed for the comparison to the identification number.

8. The method according to claim 1, wherein a mobile switching center registering access to the first private branch exchange implements the check with respect to identity of the private network for the first private branch exchange and for the private branch exchange of the call destination and, given identity, transmits the routing information to the first private branch exchange.

9. The method according to claim 1, wherein the check with respect to identity of the private network for the first private branch exchange and for the private branch exchange of the call destination is implemented by a service control point of an intelligent network that is linked into the public mobile radio telephone network by connection to at least one mobile switching center, and wherein, given identity, a mobile switching center registering access to the first private branch exchange is informed to transmit the routing information to the private branch exchange.

10. The method according to claim 9, wherein a respective identification number for identifying the private exchange, and identification number is for identifying the respective private network is allocated for every private network by the service control point.

11. The method according to claim 10, wherein the identification numbers for identification of the private branch exchange are taken from the number area of the mobile radio telephone subscriber telephone numbers assignable in the public mobile radio telephone network.

12. The method according to claim 1, wherein for mobility, the called subscriber employs a combined radio telephone subscriber station with which the subscriber is automatically registered in supply areas of mobile switching centers of the public mobile radio telephone network and in areas of the private branch exchange of the private network.

13. A system for routing in the connection setup for calls between a first subscriber and a second subscriber, a call being initiated by the first subscriber by selecting a telephone number and being directed to the second subscriber who moves between coverage areas of mobile switching centers of a public mobile radio telephone network and areas of private branch exchange of at least one private network and uses at least one radio telephone subscriber station for receiving and transmitting the calls, comprising:

means in the private network for setting up a connection to a first private branch exchange based on a selected telephone number and for sending a mobile subscriber telephone number from the private branch exchange to the public mobile radio telephone network;

means in the public mobile radio telephone network for storing at least one identification number with which the private network is identified for access to the private branch exchange of the private network;

means in the public mobile radio telephone network for offering a routing number based on the incoming mobile radio telephone subscriber telephone number and means for checking a routing number with reference to the stored identification number as to whether the call destination lies in an area of a private branch exchange of a same private network to which the first private branch exchange belongs;

means in the public mobile radio telephone network for clearing down the call given identity of the private network for the first private branch exchange and for the private branch exchange of the call destination, and for sending routing information that define the call destination to the first private branch exchange the private network, which sets up the connection to the call destination in the private network based on the routing information.

14. The system according to claim 13, wherein the system further comprises a mobile switching center in the public mobile radio telephone network registering accesses to the first private branch exchange for checking the identity of the private network by comparing the routing number to the identification number.

15. The system according to claim 13, wherein the system further comprises, for checking the identity of the private network by comparing the routing number to the identification number, a service control point of an intelligent network that is respectively linked into the public mobile radio telephone network by connection to at least one mobile switching center, and, given identity, informs a mobile switching center registering access to the first private branch exchange to transmit the routing information to the private branch exchange.