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WO1997033441A1 - Mise en oeuvre de la fonction de renvoi d'appel par utilisation de tableaux d'acheminement perfectionnes - Google Patents

Mise en oeuvre de la fonction de renvoi d'appel par utilisation de tableaux d'acheminement perfectionnes Download PDF

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Publication number
WO1997033441A1
WO1997033441A1 PCT/CA1997/000161 CA9700161W WO9733441A1 WO 1997033441 A1 WO1997033441 A1 WO 1997033441A1 CA 9700161 W CA9700161 W CA 9700161W WO 9733441 A1 WO9733441 A1 WO 9733441A1
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WO
WIPO (PCT)
Prior art keywords
exchange
switching
call
office
dialed
Prior art date
Application number
PCT/CA1997/000161
Other languages
English (en)
Inventor
L. Lloyd Williams
R. William Carkner
John Milton Anderson
Michael Andrew Gaskin
William Edward Taylor
Original Assignee
Stentor Resource Centre Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/612,660 external-priority patent/US6002757A/en
Application filed by Stentor Resource Centre Inc. filed Critical Stentor Resource Centre Inc.
Priority to AU18651/97A priority Critical patent/AU1865197A/en
Publication of WO1997033441A1 publication Critical patent/WO1997033441A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/64—Distributing or queueing
    • H04Q3/66—Traffic distributors
    • H04Q3/665—Circuit arrangements therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0029—Provisions for intelligent networking
    • H04Q3/005—Personal communication services, e.g. provisions for portability of subscriber numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/4228—Systems providing special services or facilities to subscribers in networks
    • H04M3/42297—Systems providing special services or facilities to subscribers in networks with number portability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13097—Numbering, addressing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13098—Mobile subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13102—Common translator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13103—Memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13141—Hunting for free outlet, circuit or channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13149—Change of provider, e.g. network or service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13349—Network management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13353—Routing table, map memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13513—UPT - personal as opposed to terminal mobility, inc. number portability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13541—Indexing scheme relating to selecting arrangements in general and for multiplex systems routing

Definitions

  • This invention relates to telephone networks, but more particularly, to a method and system for providing number portability using IN and switch based database queries.
  • each telephone subscriber has a number in the NXX-NXX-XXX format, where N represents a digit from 2-9 and X represents a digit from 0-9.
  • the first group of three digits indicates the area code or NPA of the subscriber
  • the second group of three digits indicates a switching exchange or service switching point to which the subscriber is connected
  • the last four digits indicates the address of the subscriber within the service switching point. Digits 0 and 1 are of course not available as the first digit (N) to allow operator and long distance services.
  • POTS Plain Ordinary Telephone Service
  • This demand has placed a large impact on the pool of numbers available for customers.
  • a metropolitan area which used to be served by one area code now requires several. The problem is of course compounded by the need to assign new telephone numbers to subscribers which move from one region to another.
  • the customer is interested in forming a seamless communication network in terms of feature operation, and dialing patterns. It also would like its network to be transparent to calling clients and customers, with calls easily covered, routed and transferred throughout their network as though they were at a single location. Number portability therefore becomes important to them, not only within their private network, but externally as well.
  • Equal access is an operating company tariff which provides a given subscriber access that is equal in type and quality to every inter-LATA carrier.
  • Each IEC has a dialing arrangement, call-screening technique, routing procedure, billing record, and signalling protocol are required to implement the EA environment.
  • the EA concept originated in the United States with the modified final judgment (MFJ) of 1982 in which AT&T lost its long-distance monopoly and was also required to divest itself of the Bell operating companies (BOCs) . This divestiture action resulted in the formation of seven regional holding companies, each comprised of a number of the original BOCs. Manufacturers have implemented the EA concept according to the regulatory requirements of the 1982 MFJ.
  • the United States EA concept is built on geo-politically defined local access and transport areas (LATAs) .
  • LATA is a fixed non-overlapping geographic area determined at the time of the MFJ ruling. Telecommunication services within a LATA, including local and toll calls within a LATA, are carried by Bell operating companies.
  • Inter ⁇ LATA traffic must be carried by an inter-LATA carrier (IC) .
  • IC inter-LATA carrier
  • the BOC must transfer inter-LATA traffic to the IC directly from the end office (EO) or via an intermediate switch called an access tandem (AT) .
  • EO end office
  • AT access tandem
  • POP point of presence
  • regulators have requested that once implemented, number portability should be available across competing networks.
  • network facilitators have been unsuccessfully researching options for delivering a service in which telephone numbers are not tied to equipment locations.
  • New telephone networks with Advanced Intelligent Network (AIN) concepts have been proposed to support faster development of new services through a network architecture in which network functions and interfaces are standardized providing greater independence between service software and technology.
  • AIN Advanced Intelligent Network
  • LNP Local Number Portability
  • IILC Information Industry Liaison Committee
  • LNP Local Number Portability
  • customers With the introduction of Local Number Portability (LNP) in the North American telephone network, customers will be able to take their current telephone numbers with them when they move within an area defined by the federal or state regulator, such as a city or a county.
  • LRN Location Routing Number method
  • QoR Query on Release
  • These methods are based on a serving switch making an AIN Transaction Capabilities Application Part (TCAP) query to a remote database which is common to a large number of switches.
  • TCAP Transaction Capabilities Application Part
  • the database returns the information that is required to complete the call to the switch which now serves the customer.
  • This method requires an extensive signalling network to launch an information query and send back the required data.
  • Number portability requires the treatment of all calls to a specific number irrespective of the point of origin, making the terminating switch the most logical location to control the call. Initially, this concept seemed to present an inexpensive option for allowing portability, but it was soon realized that as the numbers increase, many additional circuits would be required. At this point, release link trunks can be employed to reduce the connections, but this requires a common protocol and significant interconnection development. Most solutions carry significant development requirements and it is therefore important to choose the option which can support the requirements over the long term.
  • Terminating Switch Routing This proposal consists of the routing of calls using the existing NANP to the expected terminating switch location where, when numbers are owned by another network, calls are then route advanced to that network. In some cases, release link trunks are envisioned to reduce the number of circuits required. Some problems still exist in implementing these proposed methods, including flash cuts, calls being routed several times between networks and inefficient routing schemes. In addition, the solutions proposed above, are meant to make use of AIN technology. Although AIN is considered a subset of Intelligent Networks (IN), number portability should not be limited to AIN networks only.
  • I Intelligent Networks
  • Another object of the present invention is to provide a method of routing calls between networks with ported numbers while making use of existing facilities, minimizing call routing complexities and costs.
  • Yet another object of the present invention is to provide number portability such that calls to ported numbers are identified by using the public network's switch hierarchy.
  • Yet another object of the present invention is to provide number portability wherein ported calls within a local area are identified locally, whereas calls to ported numbers which are routed external of the calling area are identified externally thereof.
  • Yet another object of the present invention is to provide number portability such that the terminating location for calls to ported numbers are identified at the originating switch.
  • Yet another object of the present invention is to provide number portability such that the terminating location for calls to ported numbers are identified at an alternate or terminating switch when the originating switch is unable to identify ported numbers.
  • Yet another object of the present invention is to provide number portability wherein the location of ported numbers are identified from a LNP table collocated at the switch.
  • a first aspect of the invention is to provide in a telephone network having a number of telephone switching offices equipped with SSPs (Service Switching Points) , a method of providing number portability for the treatment of calls from a calling party to a ported number of a called party, comprising the steps of:
  • step c) querying a second directory number database collocated with said first directory number database, to obtain a routing option, if the dialed digits are determined at step b) to be associated with a ported number;
  • IAM Initial Address Message
  • a second aspect of the invention is to provide in a telephone network having a number of telephone switching offices equipped with SSPs (Service Switching Points), a system for providing number portability for the treatment of calls from a calling party to a portable number of a called party, comprising:
  • first directory number database means for determining whether said dialed digits are associated with a portable number
  • second directory number database means collocated with said first directory number database means, for providing a routing option, if said dialed digits are determined to be associated with a portable number and for translating said dialed digits to provide a new routing option, such that when an Initial Address Message (IAM) containing a new routing option is received at said terminating office said terminating office can enable said call to reach said called party.
  • IAM Initial Address Message
  • Fig. 1 is a diagram illustrating generally the basic signalling call flow between an originating and a terminating office
  • Figs. 2a and 2b are diagrams illustrating signalling call flow scenarios according to a first and second embodiment of the present invention
  • Figs. 3a and 3b are diagrams illustrating signalling call flow scenarios according to a third and fourth embodiment of the present invention.
  • Figs. 4a and 4b are diagrams illustrating database tables for use with the present invention.
  • Fig. 5 is a diagram illustrating a typical network which can make use of the method of the present invention.
  • Fig. 6 is a diagram illustrating a call scenario for a network having access to a CLEC
  • Figs. 7a and 7b are block diagrams illustrating the use of the enhanced portability table according to the embodiment of Fig. 2b, 4a and 4b;
  • Figs. 8 is a block diagram illustrating how the enhanced portability tables are updated
  • Fig. 9 is a block diagram of a platform used to update the enhanced portability table of the present invention.
  • Fig. 10 is a block diagram illustrating various storage alternatives for the enhanced portability table.
  • ACM Address Complete Message
  • AIN Advanced Intelligent Network
  • ANM Answer Message
  • CCS7 SS7 network signalling
  • CLEC Competing Local Exchange Carrier
  • DN Directory Number
  • LAN Local Area Network
  • LATA Local Access Transport Area
  • LRN Location Routing Number
  • IAM Initial Address Message
  • IEC Inter Exchange Carrier
  • ILEC Incumbent Local Exchange Carrier IN: Intelligent Network; IOC: Input Output Controller; ISDN: Integrated Services Digital Network; ISUP: ISDN User Part;
  • NPAC Number Portability Administration Center
  • POTS Plain Ordinary Telephone System
  • PSTN Public Switching Telephone Network
  • REL Release Message
  • RLC Release Complete
  • SCP Signalling Control Point
  • SMS Services Management System
  • SSP Service Switching Point
  • STP Signalling Transfer Point
  • SUS Suspend Message
  • TCAP Transaction Capabilities Application Part
  • WAN Wide Area Network
  • AIN is considered a subset of IN.
  • IN will be used hereinafter, even though the solutions offered here are applicable to AIN as well.
  • a typical SS7 network consists of signalling links and nodes.
  • SS7 nodes are referred to as signalling points (SP) and are interconnected by signalling links.
  • SP signalling points
  • Each SS7 signalling node is assigned a unique point code, serving as the network address for message routing.
  • SS7 signalling nodes include signalling Points (SP) , service switching points (SSP) , service control points (SCP) and signal transfer points (STP) .
  • SP signalling points
  • SP are capable of sending and receiving SS7 messages with other SS7-equipped telephone offices, and routing calls based on the information exchanged. Incoming messages are formatted and transferred to the relevant processing function in the switch. Outgoing messages are transmitted over the signalling links.
  • SSPs Service switching points
  • SP Signalling Points
  • SSPs interact with databases to provide services and routing.
  • SCP Service control points
  • SCPs are often referred to as SS7 services databases.
  • One or more SCPs can serve as a central intelligence point in the network for enhancing how and if calls are to be routed through the network. Queries and responses to and from the SCP are carried over SS7 signalling links in the form of packet messages.
  • Signal transfer points STP
  • STP Signal transfer points
  • STP are special SS7 nodes which provide a message switching function between other nodes and a SS7 network. Acting as a packet switch, it examines incoming messages and then routes them over the appropriate signalling link to the proper destination switching offices and databases. In this particular function, it supports end-to-end signalling, i.e. in transit (local, tandem and toll) connections, required for transaction messaging used for special services.
  • the STP does not generally act as a source or sink for SS7 messages.
  • IAM Initial Address Message 15
  • IAM Indicates a request to each subsequent exchange for call set-up and to reserve the indicated trunk. Call connection will not be completed until the status is returned indicating the call path has been confirmed and the dialed number exists and is idle.
  • the IAM contains information about both the calling and called parties.
  • ACM Address Complete Message 16
  • Answer Message 17 Returned by the terminating exchange once the call has been answered. Both directions of the call path 18 are established at this time.
  • Release Message 19 Sent by the originating office to indicate that the originating party has terminated the call.
  • Release Complete 20 Indication from the terminating exchange that the release message has been received and all connections have been terminated.
  • the RLC can be considered as an acknowledgment of a REL message and the circuit being taken down.
  • the signalling call flow is illustrated for call set-up and take-down of a call between originating office 10 and terminating office 11, via tandem exchange or intermediate office 12.
  • the first message sent during ISUP signalling call set up is an Initial Address Message 15 (IAM), which is created and sent from an originating office 10 to a tandem exchange 12 and re-created at tandem exchange 12 and forwarded to terminating office 11.
  • IAM Initial Address Message
  • the STP pairs 13 and 14, as indicated above, have been shown but are usually transparent to ISUP signalling.
  • the IAM message 15 passes information about the call to all subsequent offices in the path.
  • the IAM reserves a voice path while verifying the availability of the destination station, at the far end, i.e. terminating office 11.
  • An Address Complete Message (ACM) 16 then sends confirmation that the dialed address both exists and is idle. Where the far end is available, a call path is established. Once the called party answers, an answer message (ANM) 17 is then returned to the originating office 10 and the conversation 18 then begins.
  • ACM Address Complete Message
  • Call termination can be initiated from either the originating office 10 or the terminating office 11.
  • Most ISUP protocols make use of release messages in either direction, for example, REL message 19 of Fig. 1.
  • a release complete message (RLC) 20 is then returned, in this case, from the terminating office 11 to the originating office 10, indicating that all circuits have been returned to the available resource pool.
  • RLC release complete message
  • one embodiment of the present invention makes use of the switch hierarchy which exists in most public networks in order to provide local number portability. That is, as a call progresses through its path to the called party, the identification of whether the dialed number is ported, is done as the call is routed from the originating switch to the new terminating switch where the called station is now ported.
  • ⁇ ported' is used to indicate that a connection or ⁇ port' for the called station exist at that switch.
  • the location of a called station or where it was ported was based on it's NPA-NXX-XXXX numbering plan.
  • a called station could be located in a network based on this numbering plan.
  • the identification of the switch on which a called station is ported can no longer be established by simply routing the call based on the station's directory number.
  • the identification of whether the dialed number is ported is done as the call is routed from the originating switch to the new terminating switch where the called station is now ported. This is done regardless of whether the called party is served locally, externally of the calling area, by the ILEC or a CLEC.
  • a table is required on each telephone exchange in the network to permit a binary search to be performed to determine whether the North American Numbering Plan (NANP) can be used to route the call.
  • NANP North American Numbering Plan
  • a table is shown in Fig. 4a and will be described further below.
  • the determination of whether the destination number is flagged as unique i.e. is a portable number, is made from an enhanced table located at a switching node along the call path.
  • a routing option is provided to enable to call to reach its final destination.
  • the routing option is provided, in response to a query to an external database. This is illustrated with reference to Figs. 2a and 3a.
  • the call scenario illustrated in Fig. 2a is based on calls made locally wherein no toll charges apply.
  • the updated tables show that toll calls, i.e. those with an NPA prefix 35, should be routed via CIC 010 trunk 36 serving a toll or tandem exchange (not shown) .
  • the updated table 33 also includes a list of station numbers 40 identified as being portable. In the example of Fig. 2a, the station having telephone number 789-2000 has been moved to a new location in the network which is normally served by a switching office 31 serving the (780) exchange. Therefore, the updated table 33 indicates that calls directed to portable numbers should launch a query to the SCP 41.
  • a TCAP message 42 is thus formulated at the originating switch 30 and then launched to the SCP 41, via STP 43.
  • a table such as shown in Fig. 4b, provides the routing information.
  • a response 44 would be sent back from the SCP to the originating switch 30 indicating that the call is to be routed to the CIC (780) trunk 38 and not the CIC (789) trunk 37.
  • an IAM is formulated containing the required information to establish a call path to termination office 31.
  • a determination of how and where the call should be routed for the portable number is made at the updated table.
  • the updated directory table would be further enhanced with the actual routing option normally provided by the external database.
  • the routing option for the dialed number would immediately indicate that the call is to be routed to the CIC (780) trunk 38.
  • An Initial Address Message (IAM) representative of this routing option would be created at the originating office 30 to establish a call with terminating office 31 where the called station is now ported.
  • IAM Initial Address Message
  • a calling party 45 is attempting to reach a station 46 located in an area where toll charges apply.
  • the area is situated in a different NPA, i.e. wherein the area code of the called party differs from the area code of the calling party. Therefore, since the originating office 47 identifies that the dialed number is a toll call, an IAM 48 is formulated at the originating switch 47 and forwarded to NPA tandem office 50. The IAM message 48 is sent as a result of the number translation that took place at the table 49 of the originating switch 47.
  • the IAM message 48 is interpreted and the dialed number is identified to be associated with a portable number from a table 51, similar to the updated table 49 at the originating switch 47.
  • a TCAP query 52 can therefore be launched from the tandem office 50 to the SCP 41, via the STP 43.
  • the SCP 41 a determination is made of how the call is to be routed.
  • the response 53 to the SCP query 52 contains a new routing option indicative of a trunk to route the call to the new terminating office 31 now serving the ported called party.
  • a new IAM 54 is forwarded to the new terminating office 31.
  • the terminating office 31 serves those telephone numbers having (780) exchanges.
  • the terminating office 31 routes the call to called station 46 and an acknowledgment message 55 is returned to the originating office 47, indicating that a conversation path 56 can be established.
  • a determination of how and where the call should be routed for the ported number is made at the updated table.
  • the updated directory table would be further enhanced with the actual routing option normally provided by the external database.
  • the routing option for the dialed number would immediately indicate that the call is to be routed to the CIC (780) trunk 38 connecting tandem office 50 to the new terminating office 31 of the called party 46.
  • tandem office instead of forwarding a toll call via the tandem office to the switching office which would normally serve the call, if the number was not portable, the tandem office is provided with an updated table enabling it to determine at that point in the call path, whether the call is directed to a portable number and, from a database query, which switching office is now serving the called party.
  • NANP Network Address Translation
  • blocks of numbers are assigned to alternate service providers, they would be considered within the NANP and therefore would be routed directly based on the assigned block. Therefore, with each portable number, the terminating exchange must be updated with the information that the number is now portable.
  • number portability is implemented by augmenting the existing Directory Number table with a field to indicate the number is portable. This is shown in Fig. 4a.
  • the internal database 60 at the terminating office is provided with a customer profile which includes, amongst others, a directory number field 61 and a portability field 62. This table can of course be an exclusion table, wherein the absence of the dialed DN indicates number portability.
  • the enhanced table can include a unique designation for portable numbers within the incumbent LEC network, portable numbers in a competitive local exchange carrier (CLEC) network, and numbers which have moved into another area such as an NPA. Examples of these conditions are illustrated in the table below.
  • CLEC competitive local exchange carrier
  • the tables need not be identical on each exchange. Thus tables can be updated uniquely and need not be duplicated or replicated across all exchanges by metropolitan area, local area, region, LATAs or any other area. This reduces the size of each table which becomes important once portable number penetration is significant. Number ranges will also be an important mechanism for reducing search time and table size.
  • a geographic area 650 is shown comprised of multiple regions, each of which is served by one or more switching central offices (COs) .
  • COs switching central offices
  • Those switching offices that share a signalling trunk also share each others list of portable numbers.
  • the switching office 651 of region A shares a list of local portable numbers with the switching office 652 of region B, as well as the switching offices of regions G, X and Y.
  • the list of portable numbers of the switching office 651 of region A is not available to the switching office 653 of region D, since those two offices do not share a common signalling trunk.
  • tandem office 656 Since the tandem office 656 shares a signalling trunk with the switching office 653 of region D, it will be able to identify, from it's directory number database, that the dialed digits sent from region A are directed to a ported number now identified with region D.
  • FIG. 6 A call scenario making use of the network illustrated in Fig. 5, is shown in Fig. 6.
  • local exchanges LS21, LS22 and CLEC21 share a list of ported numbers, since they are connected and share at least one common signalling trunk.
  • local exchanges LS11, LS12, LS13 and CLEC11 also share a list of ported numbers, for the same reasons.
  • calls made to locally ported numbers will be routed based on information obtained at a local switching office serving the called party.
  • the switching office LS21 will direct the call via a toll exchange to enable the routing of the call.
  • a search is made at that exchange to determine whether the called number is portable. If ported, the toll exchange will either query an external database or one resident on the exchange to determine the routing option for that call. The call can then be completed as indicated before. Therefore, a certain level of control over the size of the database required, can be obtained by limiting how many switching offices will be sharing a list of ported numbers.
  • the enhanced portability table has been further provided with numbers ported to terminating switches located in regions served by other area codes.
  • an external database such as an SCP not required
  • the routing option is available directly at the originating or serving exchange from where the call is originating or at an alternate exchange when the serving exchange cannot provide LRN service.
  • the use of this enhanced table can be particularly advantageous as the number of portable Directory Numbers (DNs) increase in the network.
  • DNs portable Directory Numbers
  • the enhanced routing table 701 provides not only ported numbers for the same area code, such as shown at reference 702, but also ported numbers in other area codes such as shown at 703 and 704, wherein the subscriber is moving from a location with area code 817 to a location with area code 613.
  • the serving office would not only be able to determine which terminating switch to route the call for switches located in the same area code, but also be able to determine which toll office to route the call for calls ported to terminating offices located in a different NPA.
  • FIG. 7b An example of an enhanced routing table is shown in Fig. 7b for numbers ported to switches in the same area code, i.e. area code 613. If the subscriber is changing service provider, the table is further provided with a service provider ID 706 to enable the network to identify the subscriber's choice of service provider.
  • the merging of the two tables identified in Fig. 4a and 4b will result in faster, more efficient data lookup.
  • the content of the tables are, however, not limited to the items identified. They have the flexibility to grow to accommodate additional items normally provided via a TCAP query to an SCP.
  • the data entries are related to individual customers (business or residential) , use of these tables and the associated data is not limited to LNP applications.
  • the enhanced routing tables can be updated directly at each switch as illustrated in Fig. 8 from a national Services Management System 800 via a data router 801 or from a local Services Management System.
  • the national SMS database would be downloaded via router 801 to update each SSP with the enhanced routing tables 802.
  • the updates to individual SSPs could be done from the national SMS via local or regional SMS 803.
  • only network change information would be provided, however complete copies of the data could also be transmitted.
  • the updates could be done at frequent intervals on a daily basis or continuously as the need arises.
  • Data filtering by router or SMS could be employed to limit the amount of data each switch receives, making the data unique to its portability area.
  • the new routing information is updated directly from the national or local SMS to individual SSPs.
  • Several data networking options 902 can be used. These include, but are not limited to TCP/IP, dedicated data links, WAN/LAN and CCS7 networks.
  • a data gathering command is initiated by the switch 903 or by the SMS 901.
  • the extra memory capacity can be provided via an external drive 1001 connected via a suitable bus to the central processor of the switch 1002.
  • the switch internal drive 1003 could be upgraded to increase its memory capacity to enable storage of the newly downloaded information.
  • an external storage drive 1004 could be connected through an SS7 peripheral device. In conjunction with the drive storage options, or on a stand along basis, data can be stored within the central processor on memory cards. This would speed up data access. Backup copies could be stored on associated disk drives 1001, 1003 or 1004.
  • Data management software is used to manage the data update process.
  • a direct memory access procedure can also be used to enable data to be sent directly to the central processor memory.
  • a scheduling function resides within the switch to control and perform memory updates.
  • a feedback loop to the SMS could also be provided to permit the SMS to view the data content on the switch.
  • the switch will receive an initial copy of a complete set of data relevant to such conditions as the particular portability serving area from the national SMS or the SCP database. Once this data has been provided, only updates containing the relevant information will be automatically sent from the SMS over the data transfer network to the switch's database table.
  • the database is provided with sufficient flexibility to store and receive additional update information associated with LNP such as service provider ID, etc.
  • the resident information can be used to support new or modified non-LNP services and capabilities that can utilize the information resident in this switch-located database. This solution therefore provides better use of the network's resources and at the same time, reduces the costs associated with providing number portability.
  • the data contained in the enhanced data tables could also contain other information currently provided by an external SCP.
  • calls made using the toll free 800 or 888 prefix could be routed from the originating switch without the need for a TCAP query to an external SCP.
  • calls making use of the toll free 800 or 888 prefix trigger a TCAP query to an SCP.
  • the routing option could be provided at the serving exchange or an alternate exchange along the signalling path if the serving exchange cannot serve the call.
  • calls directed to telephone pager numbers trigger a query to an external SCP to determine how to route the call. All these numbers could be updated at each telephone exchange with the system and method of the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)

Abstract

La présente invention concerne un procédé permettant une fonction de renvoi d'appel pour traiter les liaisons d'un appelant vers le numéro spécifique en renvoi d'un appelé. Une fois que les chiffres composés sont reçus par le commutateur desservant l'appelant, le procédé consiste à déterminer si la liaison correspond à un numéro qui fait l'objet d'un renvoi d'appel. Si ce numéro fait l'objet d'un renvoi d'appel, le procédé consiste à prendre les nouvelles informations d'acheminement dans un répertoire perfectionné à tableau de numéros résidant au niveau du central d'origine de l'appel. Dans le cas où le central d'origine de l'appel ne peut pas assurer le service de numéros d'acheminement d'emplacements ou 'LRN' (Location Routing Number), le procédé consiste à aller rechercher ces formations au niveau d'un central de remplacement. Le système de gestion des service ou 'SMS' (Service Management System) met à jour automatiquement les informations d'acheminement et les envoie directement à chaque central téléphonique.
PCT/CA1997/000161 1996-03-08 1997-03-07 Mise en oeuvre de la fonction de renvoi d'appel par utilisation de tableaux d'acheminement perfectionnes WO1997033441A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18651/97A AU1865197A (en) 1996-03-08 1997-03-07 Providing number portability by means of enhanced routing tables

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/612,660 1996-03-08
US08/612,660 US6002757A (en) 1996-03-08 1996-03-08 Number portability using enhanced routing table
US08/746,272 US6097801A (en) 1996-03-08 1996-11-07 Number portability using enhanced routing table
US08/746,272 1996-11-07

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