Method of connecting a plurality of virtual networks

• US 5,917,899 A
• Filed: 12/17/1996
• Issued: 06/29/1999
• Est. Priority Date: 12/17/1996
• Status: Expired due to Term

• Current Assignee: SBC Properties, L.P. (AT&T, Inc.)
• Original Assignee: Ameritech Corp. (AT&T, Inc.)
• Inventors: Moss, John Wesley, Madoch, Pitsa
• Primary Examiner(s): Wolinsky, Scott
• Application Number:
  US08/768,382
• Time in Patent Office: 924 Days
• Field of Search: 379/201, 379/207, 379/219, 379/220, 379/221, 379/229, 379/230
• US Class Current: 379/221.08
• CPC Class Codes: H04M 2242/22 Automatic class or number identification arrangements
• CPC Class Codes: H04M 3/42102 Making use of the called party identifier
• CPC Class Codes: H04M 7/00 Arrangements for interconnection between switching centres
• CPC Class Codes: H04Q 2213/13222 PBX circuits in public exchange, centrex
• CPC Class Codes: H04Q 2213/13331 Abbreviated dialling
• CPC Class Codes: H04Q 2213/13345 Intelligent networks, SCP
• CPC Class Codes: H04Q 2213/13377 Recorded announcement
• CPC Class Codes: H04Q 2213/13383 Hierarchy of switches, main and subexchange, e.g. satellite exchange
• CPC Class Codes: H04Q 2213/13384 Inter-PBX traffic, PBX networks, e.g. corporate networks
• CPC Class Codes: H04Q 2213/13395 Permanent channel, leased line
• CPC Class Codes: H04Q 2213/13399 Virtual channel/circuits
• CPC Class Codes: H04Q 3/0029 Provisions for intelligent networking
• CPC Class Codes: H04Q 3/66 Traffic distributors
• CPC Class Codes: H04Q 3/72 Finding out and indicating number of calling subscriber

Abstract

A method using an advanced intelligent network to seamlessly connect a plurality of virtual networks includes the steps of: (a) Receiving a number of dialed digits at a first service switching point in a first local access and transport area (10); (b) When the first service switching point is determined to be a hub service switching point (22), sending a query to a service control point (24); (d) Determining if the dialed digits require an access to a private networks interLATA call; and (e) When the dialed digits require access to the private networks interLATA call, routing the call over a tie line (40) to a second hub service switching point (34) in a second local access and transport area (26).

Claims

1. A method of connecting a plurality of virtual networks, comprising the steps of:

(a) receiving a plurality of digits at a first service switching point in a first local access and transport area;

(b) sending a query from the first service switching point to a switching control point;

(c) when the plurality of digits result in a call that is an interLATA call, sending a response from the switching control point to the first service switching point that contains a routing instruction to a first hub service switching point;

(d) routing the interLATA call from the first service switching point to the first hub service switching point;

(e) transmitting an initial address message to the first hub service switching point;

(f) sending a second query to the switching control point from the first hub service switching point;

(g) receiving a second response from the switching control point; and

(h) routing the interLATA call over a tie line to a second hub service switching point in a second local access and transport area.

2. The method of claim 1, further including the steps of:

(i) sending a third query to the switching control point from the second hub service switching point;

(j) receiving a third response from the switching control point;

(k) routing the call to a second terminating service switching point.

3. The method of claim 2, further including the step of:

(l) routing the call from the second service switching point to a called party.

4. The method of claim 2, wherein step (i) further includes the steps of:

(i1) transmitting an abbreviated dialing code to the switching control point;

(i2) converting the abbreviated dialing code to a directory number.

5. The method of claim 2, wherein step (j) further includes the step of receiving a directory number.

6. The method of claim 1, wherein step (a) further includes the steps of:

(a1) receiving an off-hook signal at the first service switching point;

(a2) transmitting a dial tone from the first service switching point.

7. The method of claim 1, wherein step (b) further includes the step of sending the plurality of digits in the query.

8. The method of claim 1, wherein step (e) further includes the step of transmitting the plurality of digits less an access code as part of the initial address message.

9. The method of claim 1, wherein step (e) further includes the step of transmitting a translated routing number as part of the initial address message.

10. The method of claim 1, wherein step (g) further includes the step of receiving a primary trunk group as part of the second response.

11. The method of claim 1, wherein step (h) further includes the step of selecting the tie line based on a primary trunk group.

12. The method of claim 1, wherein step (h) further includes the step of transmitting the plurality of digits less an access code over the tie line to the second hub service switching point.

13. The method of claim 1, wherein step (h) further includes the step of transmitting an abbreviated dialing code over the tie line to the second hub service switching point.

14. A method of connecting a plurality of virtual networks, comprising the steps of:

(a) receiving a plurality of dialed digits at a first service switching point in a first local access and transport area;

(b) when the first service switching point is determined to be a hub service switching point, sending a query from the first service switching point to a service control point;

(c) determining if the plurality of dialed digits require an access to private networks interLATA call; and

(d) when the access to private networks interLATA call is required, routing a call over a tie line to a second hub service switching point in a second local access and transport area.

15. The method of claim 14, further including the steps of:

(e) when a called party is not directly connected to the second hub service switching point, transmitting a query from the second hub service switching point to a switching control point;

(f) receiving a response from the switching control point;

(g) routing the call to a second service switching point.

16. The method of claim 14, further including the step of:

(e) when a called party is directly connected to the second hub service switching point, routing the call to the called party.

17. The method of claim 14, further including the steps of:

(e) when the first service switching point is not the hub service switching point, sending a first query to the switching control point;

(f) receiving a first response from the switching control point;

(g) routing the call to the hub service switching point.

18. The method of claim 17, further including the steps of:

(h) sending a second query from the hub service switching point to the switching control point;

(i) receiving a second response including a primary trunk group from the switching control point;

(j) routing the call over the tie line to the second hub service switching point in the second local access and transport area.

19. A method of connecting a plurality of virtual networks, comprising the steps of:

(a) selecting the plurality of virtual networks to connect;

(b) receiving a network access request at a service switching point in a first of the plurality of virtual networks;

(c) determining if the network access request is an interLATA request;

(d) when the network access request is the interLATA request, routing a network connection to a hub service switching point;

(e) determining if the network access request is to a second of the plurality of virtual networks; and

(f) when the network address request is to the second of the plurality of virtual networks, sending a routing instruction to the hub service switching point.

20. The method of claim 19, further including the step of:

(g) routing the network connection to a second hub service switching point in the second of the plurality of virtual networks.

21. The method of claim 20, further including the steps of:

(h) receiving a second routing instruction at the second hub service switching point;

(i) routing the network connection to a second terminating service switching point.

22. The method of claim 21, further including the step of:

(j) routing the network connection to a terminal point.

23. The method of claim 19, wherein step (a) further includes the step of selecting a plurality of tie lines to connect a plurality of hub service switching points in the plurality of virtual networks.

24. The method of claim 23, further including the step of determining a primary trunk group for each of the plurality of tie lines.