Enhanced efficient telephone number portability

• US 5,867,569 A
• Filed: 09/27/1995
• Issued: 02/02/1999
• Est. Priority Date: 04/03/1995
• Status: Expired due to Term

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Martinez, Edgar, Pino, Locillo Giuseppe, Wiebe, Charles Richard
• Primary Examiner(s): Zele, Krista
• Assistant Examiner(s): Hunter, Daniel S.
• Application Number:
  US08/534,668
• Time in Patent Office: 1,224 Days
• Field of Search: 379/201, 379/207, 379/210, 379/211, 379/213, 379/220, 379/221, 379/229, 379/230
• US Class Current: 379/114.27
• CPC Class Codes: H04M 3/42297 with number portability
• CPC Class Codes: H04Q 2213/13097 Numbering, addressing
• CPC Class Codes: H04Q 2213/13102 Common translator
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13141 Hunting for free outlet, circuit or channel
• CPC Class Codes: H04Q 2213/13149 Change of provider, e.g. network or service
• CPC Class Codes: H04Q 2213/13217 Cranckback in routing, trombone connection, loopback circuit
• CPC Class Codes: H04Q 2213/13345 Intelligent networks, SCP
• CPC Class Codes: H04Q 2213/13384 Inter-PBX traffic, PBX networks, e.g. corporate networks
• CPC Class Codes: H04Q 2213/13399 Virtual channel/circuits
• CPC Class Codes: H04Q 2213/13513 UPT - personal as opposed to terminal mobility, inc. number portability
• CPC Class Codes: H04Q 2213/13527 protocols - X.25, TCAP etc.
• CPC Class Codes: H04Q 3/005 Personal communication services, e.g. provisions for portability of subscriber numbers

Abstract

Method and system are provided for efficient telephone number portability within a geographically dispersed telephony and the like switching system, wherein ported telephone numbers, when dialled and found non-existent at their number-inherent destination, a "Release Treatment" with a trigger (automatic flexible routing) searches in a database from the originating switching node or office, whereupon their new network node address is directly connected to following normal routing procedures; thus permitting realistically affordable telephone number portability, particularly local number portability (LNP).

Claims

1. A method for providing telephone number portability comprising the steps of:

a) transmitting from an originating switching office a called telephone number to its inherent switching office destination;

b) terminating connection between said originating switching office and said inherent switching office upon not being able to establish connection to said called telephone number;

c) causing said originating switching office to request a new switching office location for said called telephone number; and

d) causing said originating switching office to establish connection to said new switching office.

2. A geographically distributed telephony switching system for providing number portability within said switching system while conserving at least transmission facilities between switching nodes of the system comprising:

(a) database storage means for storing ported telephone numbers and new switching node numbers corresponding thereof;

(b) trigger means at least one of said switching nodes for enabling access to said database storage means for retrieving a new switching node number corresponding to a ported telephone number; and

(c) trunk means at at least one of said switching nodes for indicating if connection to said new switching node number entails long distance charges.

3. The system as defined in claim 2, further comprising:

(d) trunk means at said at least one switching node for indicating if connection to said new switching node number entails an overseas connection.

4. The system as defined in claim 3 further comprising data processing means for inspecting components of said new switching mode number to ascertain that connection thereto does not entail long distance charges.

5. The system as defined in claim 2, further comprising data processing means for inspecting components of said new switching node number to ascertain that connection thereto does not entail long distance charges.

6. A geographically distributed telephony switching system for providing telephone number portability within said switching system while conserving at least transmission facilities between switching nodes of the system comprising:

(a) database storage means for storing ported telephone numbers and new switching node numbers corresponding thereto;

(b) trigger means at least one of said switching nodes for enabling access to said database storage means for retrieving a new switching node number corresponding to a ported telephone number; and

(c) said trigger means comprising a permanently busied announcement trunk adapted to trigger an automatic flexible routing procedure resident in said at least one of said switching nodes.