Telephone communications network with enhanced signaling and call routing

• US 6,125,177 A
• Filed: 09/15/1997
• Issued: 09/26/2000
• Est. Priority Date: 09/15/1997
• Status: Expired due to Term

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Nortel Networks Corporation
• Inventors: Whittaker, Richard Jonathan
• Primary Examiner(s): Zele, Krista
• Assistant Examiner(s): BUI, BING Q
• Application Number:
  US08/929,404
• Time in Patent Office: 1,107 Days
• Field of Search: 370/237, 370/351, 370/352, 370/353, 370/354, 370/401, 370/410, 370/355, 379/207, 379/219, 379/220, 379/229, 379/230, 379/266, 379/242, 379/243, 395/200.69, 455/461
• US Class Current: 379/243
• CPC Class Codes: H04M 3/428 Arrangements for placing incoming calls on hold
• CPC Class Codes: H04M 7/12 for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal

Abstract

Enhanced signaling and call routing is provided in a telephone communications network that includes a local telephone central office having a POTS line connection between a subscriber station and an access junction of the office. A voice path interfaces the access junction with a circuit switch for conventional dial-up voice call placement. Modem data calls, however, follow an access path from the junction as a physical switched connection terminated in layer 1 of a network data-switching matrix. The access path continues therefrom to a data switch which interfaces an Internet service provider. Interfacing the data and circuit switches, a network controller functions to selectively configure communications paths within the central office and between the office and network in response to commands originating at the subscriber station or incoming from other networks. Additional controller functions include blocking subscriber-originated traffic from the access path and queuing incoming network-side traffic when an Internet call is on hold, invoking a tear-down of the physical switched connection to free the access path for incoming and outgoing call attempts, converting PSTN-based voice signals to an IP-based voice format and transmitting any queued data to the subscriber station followed by restoration of normal data communications.

Claims

1. Apparatus for enhanced signaling and call routing in a first communications network that includes a local telephone central office having a POTS line communicating the domain of a first subscriber station with a first port in an access junction of the office, comprising in combination:

a first signal path including first switching means for selectively communicating a second port of the access junction with a second communications network;

a second signal path including second switching means for selectively communicating a third port of the access junction with a third communications network;

control means interfacing the first and second switching means and responsive to predetermined incoming signals from the second and third networks and the subscriber station for selectively controlling the switching means to connect the station with respective ones of the first and second signal paths; and

means for acknowledging a service activate signal having a maximum call suspension time received at the control means from the first subscriber station and enabling the second switching means to complete the second signal path between the third communications network and the first subscriber station in response thereto, the acknowledgement including a set of parameters comprising;

a new controller identifier in the form of a new third network address allowing for scaleable networks;

a new maximum call suspension time should the original subscriber-specified time exceed a currently allowable maximum; and

data session identification to be used for reconnection by the first subscriber station.

2. Apparatus as claimed in claim 1, further comprising:

a data-switching matrix forming part of the second signal path; and

an access path comprising a physical switched connection from the third port of the access junction to a physical layer termination at the matrix.

3. Apparatus as claimed in claim 2, wherein the first switching means comprises a circuit switch operably responsive to a dial-up service request signal from the station for connecting the first signal path to a selected node in the second communications network.

4. Apparatus as claimed in claim 3, further comprising:

means for configuring the matrix as one of, a relay or a transparent connection to selectively communicate first subscriber station command signals from the access junction to at least one of the matrix and control means.

5. Apparatus as claimed in claim 4, further comprising means for reversibly converting PSTN-based voice signals to an IP-based voice format for transmission and reception over the third communications network.

6. Apparatus as claimed in claim 4, wherein the second switching means comprises a data switch interfacing the matrix and a service provider of the third communications network.

7. Apparatus as claimed in claim 6, further comprising means for terminating a modem of the first subscriber station at the physical layer termination and connecting the modem therefrom via the data switch to the service provider in response to a corresponding dial-up service request signal from the first subscriber station.

8. Apparatus as claimed in claim 7, further comprising:

means for ascertaining the availability of the service provider; and

means responsive to the availability of the service provider for generating higher layer protocols at the first subscriber station and communicating the protocols through the matrix and data switch to the service provider.

9. Apparatus as claimed in claim 8, further comprising:

means for negotiating higher layer protocol parameters with the service provider and ascertaining a successful conclusion to such negotiation prior to connecting the modem thereto.

10. Apparatus as claimed in claim 9, wherein the control means comprises a network controller, the apparatus further comprising:

means for invoking the service activate signal at the first subscriber station;

means for sending the service activate signal to the controller; and

means for verifying the legal status of the subscriber station invoking the service activate signal before activating service with the service provider.

11. Apparatus as claimed in claim 10, wherein the service activate signal comprises:

a subscriber identifier including a third network address, point-to-point protocol and client identification; and

a client directory number.

12. Apparatus as claimed in claim 11, further comprising:

a first hold queue disposed within the circuit switch;

means for notifying the controller of a call attempt received by the circuit switch from a second subscriber station and directing the incoming call to the first hold queue;

means responsive to the incoming call for sending a suspend request signal to the first subscriber station with caller identification via the matrix and the access junction;

a second hold queue disposed within the controller; and

means responsive to acceptance of the incoming call by the first subscriber station for invoking an on-hold network mode that includes blocking the access path and queuing incoming traffic received at the data switch from the third communications network.

13. Apparatus as claimed in claim 12, further comprising:

means for enabling protocol spoofing, spawning the queue process by the controller and queuing incoming traffic received at the controller from the third communications network.

means for enabling the controller to send a final close signal to the first subscriber station;

means for initiating a tear-down of the physical layer connection at the matrix by the first subscriber station in response to the received final close signal; and

means for enabling the circuit switch to proceed with processing the call between the first and second subscriber stations, with the third communications network call on-hold.

14. Apparatus as claimed in claim 13, further comprising:

means for sending a dial-up reconnect signal from the first subscriber station to the controller and reestablishing the physical layer connection at the matrix in response thereto;

means for detecting the absence of queued data at the second hold queue; and

means responsive to the detected absence of data at the second hold queue for resuming normal data communications between the first subscriber station and the service provider.

15. Apparatus as claimed in claim 13, further comprising:

means for detecting the end of the incoming call;

means responsive to the end of the call for enabling the controller to instruct the matrix to reconnect to the first subscriber station;

means for detecting the presence of queued data at the second hold queue and sending an interrupt signal to the controller in response thereto; and

means responsive to the received interrupt signal for transmitting the queued data from the controller to the first subscriber station via the data switch, matrix and access junction.

16. Apparatus as claimed in claim 15, further comprising:

means responsive to the transmitted queued data for reestablishing the physical layer connection at the matrix and resuming normal data communications between the first subscriber station and the service provider.

17. Apparatus as claimed in claim 13, further comprising:

means for detecting the end of the incoming call;

means responsive to the end of the call for enabling the controller to instruct the matrix to reconnect to the first subscriber station;

means for detecting the absence of queued data at the second hold queue; and

means operably responsive to the detected absence of data at the second hold queue for reestablishing the physical layer connection at the matrix and resuming normal data communications between the first subscriber station and the service provider.

18. Apparatus as claimed in claim 13, further comprising:

means for sending a dial-up reconnect signal from the first subscriber station to the controller and reestablishing the physical layer connection at the matrix in response thereto;

means for detecting the presence of queued data at the second hold queue and sending an interrupt signal to the controller in response thereto; and

means responsive to the received interrupt signal for transmitting the queued data from the controller to the first subscriber station via the data switch, matrix and access junction.

19. Apparatus as claimed in claim 18, further comprising:

means responsive to the transmitted queued data for resuming normal data communications between the first subscriber station and the service provider.

20. Apparatus as claimed in claim 18, wherein the means for enabling protocol spoofing and spawning the queue process by the controller comprises:

first test means for detecting receipt or non-receipt of an interrupt signal at the controller;

first circuit means responsive to non-receipt of the interrupt signal for interrupting service to the first subscriber station;

second test means for detecting queuing selection and the presence of available queue space at the second hold queue;

second circuit means responsive to queuing selected and available queue space for sending an instruction to the controller to queue network-side traffic; and

memory means to which the traffic is directed and temporarily stored during said service interruption.

21. Apparatus as claimed in claim 20, further comprising:

data flow control means for examining incoming traffic for predetermined spoofing responses and acknowledgements in response to one of, the detected absence of queue space or specific selection; and

means for disabling the protocol spoofing means and invoking one of, session reestablishment at the first subscriber station or generation of a return error condition signal thereat in response to specific selection or the absence of the predetermined spoofing responses and acknowledgements.

22. A method for enhanced signaling and call routing in a first communications network that includes a local telephone central office having a POTS line communicating the domain of a first subscriber station with a first port in an access junction of the office, the method comprising the steps of:

enabling a first signal path including first switching means for selectively communicating a second port of the access junction with a second communications network;

enabling a second signal path including second switching means for selectively communicating a third port of the access junction with a third communications network;

interfacing the first and second switching means with control means responsive to predetermined incoming signals from the second and third networks and the subscriber station for selectively controlling the switching means to connect the station with respective ones of the first and second signal paths; and

acknowledging a service activate signal having a maximum call suspension time received at the control means from the first subscriber station and enabling the second switching means to complete the second signal path between the third communications network and the first subscriber station in response thereto, the acknowledgement including a set of parameters comprising;

a new controller identifier in the form of a new third network address allowing for scaleable networks;

a new maximum call suspension time should the original subscriber-specified time exceed a currently allowable maximum; and

data session identification to be used for reconnection by the first subscriber station.

23. A method as claimed in claim 22, wherein the first communications network further includes a data-switching matrix forming part of the second signal path, an access path comprising a physical switched connection from the third port of the access junction to a physical layer termination at the matrix and wherein the first switching means comprises a circuit switch, the method comprising the further step of:

enabling the circuit switch to operably respond to a dial-up service request signal from the station for connecting the first signal path to a selected node in the second communications network.

24. A method as claimed in claim 23, comprising the further step of:

configuring the matrix as one of, a relay or a transparent connection to selectively communicate first subscriber station command signals from the access junction to at least one of the matrix and control means.

25. A method as claimed in claim 24, comprising the further step of reversibly converting PSTN-based voice signals to an IP-based voice format for transmission and reception over the third communications network.

26. A method as claimed in claim 24, wherein the second switching means comprises a data switch interfacing the matrix and a service provider of the third communications network, the method comprising the further step of:

terminating a modem of the first subscriber station at the physical layer termination and connecting the modem therefrom via the data switch to the service provider in response to a corresponding dial-up service request signal from the first subscriber station.

27. A method as claimed in claim 26, comprising the further steps of:

ascertaining the availability of the service provider; and

generating higher layer protocols at the first subscriber station and communicating the protocols through the matrix and data switch to the service provider in response to the availability of the service provider.

28. A method as claimed in claim 27, comprising the further step of:

negotiating higher layer protocol parameters with the service provider and ascertaining a successful conclusion to such negotiation prior to connecting the modem thereto.

29. A method as claimed in claim 28, wherein the control means comprises a network controller, the method comprising the further steps of:

invoking the service activate signal at the first subscriber station;

sending the service activate signal to the controller; and

verifying the legal status of the subscriber station invoking the service activate signal before activating service with the service provider.

30. A method as claimed in claim 29, wherein the service activate signal comprises:

a subscriber identifier including a third network address, point-to-point protocol and client identification; and

a client directory number.

31. A method as claimed in claim 30, wherein the first communications network further includes a first hold queue disposed within the circuit switch and a second hold queue disposed within the controller, the method comprising the further steps of:

notifying the controller of a call attempt received by the circuit switch from a second subscriber station and directing the incoming call to the first hold queue;

sending a suspend request signal to the first subscriber station with caller identification via the matrix and the access junction in response to the incoming call; and

invoking an on-hold network mode that includes blocking the access path and queuing incoming traffic received at the data switch from the third communications network in response to acceptance of the incoming call by the first subscriber station.

32. A method as claimed in claim 31, comprising the further steps of:

enabling protocol spoofing, spawning the queue process by the controller and queuing incoming traffic received at the controller from the third communications network;

enabling the controller to send a final close signal to the first subscriber station;

initiating a tear-down of the physical layer connection at the matrix by the first subscriber station in response to the received final close signal; and

enabling the circuit switch to proceed with processing the call between the first and second subscriber stations, with the third communications network call on-hold.

33. A method as claimed in claim 32, comprising the further steps of:

sending a dial-up reconnect signal from the first subscriber station to the controller and reestablishing the physical layer connection at the matrix in response thereto;

detecting the absence of queued data at the second hold queue; and

resuming normal data communications between the first subscriber station and the service provider in response to the detected absence of data at the second hold queue.

34. A method as claimed in claim 32, comprising the further steps of:

detecting the end of the incoming call;

enabling the controller to instruct the matrix to reconnect to the first subscriber station in response to the end of the call;

detecting the presence of queued data at the second hold queue and sending an interrupt signal to the controller in response thereto; and

transmitting the queued data from the controller to the first subscriber station via the data switch, matrix and access junction in response to the received interrupt signal.

35. A method as claimed in claim 34, comprising the further step of:

reestablishing the physical layer connection at the matrix and resuming normal data communications between the first subscriber station and the service provider in response to the transmitted queued data.

36. A method as claimed in claim 32, comprising the further steps of:

detecting the end of the incoming call;

enabling the controller to instruct the matrix to reconnect to the first subscriber station in response to the end of the call;

detecting the absence of queued data at the second hold queue; and

reestablishing the physical layer connection at the matrix and resuming normal data communications between the first subscriber station and the service provider in response to the detected absence of data at the second hold queue.

37. A method as claimed in claim 32, comprising the further steps of:

sending a dial-up reconnect signal from the first subscriber station to the controller and reestablishing the physical layer connection at the matrix in response thereto;

detecting the presence of queued data at the second hold queue and sending an interrupt signal to the controller in response thereto; and

transmitting the queued data from the controller to the first subscriber station via the data switch, matrix and access junction in response to the received interrupt signal.

38. A method as claimed in claim 37, comprising the further step of:

resuming normal data communications between the first subscriber station and the service provider in response to the transmitted queued data.

39. A method as claimed in claim 37, wherein the step of enabling protocol spoofing and spawning the queue process by the controller includes the prior steps of:

detecting receipt or non-receipt of an interrupt signal at the controller;

interrupting service to the first subscriber station in response to non-receipt of the interrupt signal;

detecting queuing selection and the presence of available queue space at the second hold queue;

sending an instruction to the controller to queue network-side traffic in response to queuing selected and available queue space; and

temporarily storing the traffic in memory means during said service interruption.

40. A method as claimed in claim 39, comprising the further prior steps of:

examining incoming traffic at data flow control means for predetermined spoofing responses and acknowledgements in response to one of, the detected absence of queue space or specific selection; and

disabling the protocol spoofing means and invoking one of, session reestablishment at the first subscriber station or generation of a return error condition signal thereat in response to specific selection or the absence of the predetermined spoofing responses and acknowledgments.