Method and apparatus for providing ringing timeout disconnect supervision in remote telephone extensions using voice over packet-data-network systems (VOPS)

• US 7,339,924 B1
• Filed: 09/30/1998
• Issued: 03/04/2008
• Est. Priority Date: 09/30/1998
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Chung, Wing-Kuen, Hwang, Cherng-Daw, Tasker, Michael
• Primary Examiner(s): Harper; Kevin C.
• Application Number:
  US09/164,429
• Time in Patent Office: 3,443 Days
• Field of Search: 370/351, 370/352, 370/356, 370/419, 379/93.01, 379/90.01, 379/219, 379/220.01, 379/225, 379/399.01, 379/413, 379/418, 379/231, 379/234, 379/265, 379/156, 379/164
• US Class Current: 370/356
• CPC Class Codes: H03M 3/02 Delta modulation, i.e. one-bit differential modulation H03M3/30 takes precedence
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04M 19/026 Arrangements for interrupting the ringing current
• CPC Class Codes: H04M 3/02 Calling substations, e.g. by ringing selective calling H04Q
• CPC Class Codes: H04M 7/0024 Services and arrangements where telephone services are combined with data services arrangements which combine a telephonic equipment and a computer H04M7/0012
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

A Multiservice Access Concentrator (MAC) provides a time limit for a first ringing voltage signal in response to an attempted call. The call is attempted via a voice over packet-data-network system (VOPS), wherein the VOPS comprises voice over Internet Protocol (IP), voice over Frame Relay, voice over Asynchronous Transfer Mode (ATM), and voice over High-level Data Link Control (HDLC) network systems. Generation of the first ringing voltage signal is terminated upon expiration of the time limit. A control message is transmitted to terminate the attempted call, wherein the control message is transmitted via the VOPS.

Claims

1. A method, comprising:

a) generating a ring signal at a remote telephone interface and starting a configurable timer of a voice over packet data network switched call control system that measures a configurable time period over which said ring signal is applied at said remote telephone interface, said generating a ring signal and said starting a configurable timer both a consequence of a connection that was established toward said remote telephone interface over a packet data network in order to place a call from a telephone interface having an off-hook condition through said remote telephone interface;

b) ceasing said ring signal and sending a control message in response to said configurable timer expiring, said sending a control message further comprising sending said control message over said packet data network to a system that initiated said connection, said system having initiated said connection in response to a ring signal observed at the telephone interface maintained by said system; and

c) changing the off-hook condition to an on-hook condition at said telephone interface maintained by said system as a consequence of said system having received said control message over the packet data network in order to prevent the telephone interface having no-disconnect supervision from remaining in the off-hook condition upon expiration of the configurable time period.

2. The method of claim 1 further wherein said configurable timer lasts within a range of 2 to 3 minutes inclusive.

3. The method of claim 1 wherein said packet data network further comprises an Internet Protocol (IP) network.

4. The method of claim 1 wherein said packet data network further comprises a Frame Relay network.

5. The method of claim 1 wherein said packet data network further comprises a High level Data Link Control (HDLC) network.

6. The method of claim 1 wherein said packet data network further comprises an Asynchronous Transfer Mode (ATM) network.

7. The method of claim 1 wherein said remote telephone interface resides at a PBX.

8. The method of claim 1 wherein said remote telephone interface reside at a central office (CO).

9. An apparatus, comprising:

a) means for providing a ring signal at a remote telephone interface as consequence of a connection that was established toward said remote telephone interface over a packet data network;

b) configurable timer means of a voice over packet data network switched call control system, the configurable timer means measures a configurable time period over which said ring signal is applied at said remote telephone interface;

c) means for ceasing said ring signal, said ceasing in response to said configurable timer expiring;

d) means for sending a control message, in response to said configurable timer expiring, over said packet data network to a system that initiated said connection, said system having initiated said connection in response to a ring signal observed at a telephone interface in order to place a call from the telephone interface having an off-hook condition through said remote telephone interface; and

e) means for providing an “

on-hook”

signal at said telephone interface as a consequence of said control message having been received by said system over the packet data network in order to prevent the telephone interface having no-disconnect supervision from remaining in the off-hook condition upon expiration of the configurable time period.

10. The apparatus of claim 9 wherein said configurable timer lasts within a range of 2 to 3 minutes inclusive.

11. The apparatus of claim 9 wherein said packet data network further comprises an Internet Protocol (IP) network.

12. The apparatus of claim 9 wherein said packet data network further comprises a Frame Relay network.

13. The apparatus of claim 9 wherein said packet data network further comprises a High level Data Link Control (HDLC) network.

14. The method of claim 9 wherein said packet data network further comprises an Asynchronous Transfer Mode (ATM) network.

15. The method of claim 9 wherein said remote telephone interface resides at a PBX.

16. The method of claim 9 wherein said remote telephone interface resides at a central office (CO).

17. An apparatus, comprising:

a first system communicatively coupled to a second system through a packet network;

said first system comprising;

a) a configurable timer of a voice over packet data network switched call control system, said configurable timer to measure a time period over which a ring signal is applied;

b) a telephone interface where said ring signal is generated;

c) a first interface to said packet network, said first interface from where a control message is sent from said first system to said second system if said configurable timer expires;

said second system comprising;

a) a second interface to said packet network, said second interface where said control message is received;

b) a third interface that transitions from an off hook state to an on hook state in response to said control message being received over the packet network in order to prevent the third interface having no-disconnect supervision from remaining in the off hook state upon expiration of the configurable time period.

18. The apparatus of claim 17 where said second system further comprises a VOPS control system communicatively coupled to said second interface and said interface.

19. The apparatus of claim 17 wherein said third interface is a PBX interface.

20. The apparatus of claim 17 wherein said third interface is a CO interface.

21. The apparatus of claim 17 wherein said third interface is a PSTN interface.

22. The apparatus of claim 17 wherein said packet network further comprises an Internet Protocol (IP) network.

23. The apparatus of claim 17 wherein said packet network further comprises a Frame Relay network.

24. The apparatus of claim 17 wherein said packet network further comprises a High level Data Link Control (HDLC) network.

25. The apparatus of claim 17 wherein said packet network further comprises an Asynchronous Transfer Mode (ATM) network.

26. The apparatus of claim 17 wherein said second system is a multiservice access concentrator (MAC) capable of:

receiving at least one data stream and at least one voice channel;

packetizing said received at least one data stream and packetizing said at least one voice channel;

multiplexing said packetized at least one data stream and said packetized at least one voice channel into a transport stream; and

,

providing said transport stream to said packet network using a configurable trunk wherein, said MAC comprises a CPU communicatively coupled to a plurality of ports, said ports from where said data stream and voice channel are said received and from where said transport stream is said provided, said CPU coupled to memory.

27. A method, comprising:

a) receiving a first ring signal at a first telephone interface, said first ring signal in response to an attempt to place a call to a second telephone interface;

b) responding to said ring signal by applying an off-hook signal at said first telephone interface and establishing a connection toward said second telephone interface over a packet data network;

c) generating a second ring signal at said second telephone interface and starting a configurable timer of a voice over packet data network switched call control system;

d) responding to said configurable timer expiring by ceasing said ring signal and sending a control message over said packet data network; and

,

e) receiving said control message over the packet data network and responding to said receiving by generating an on-hook signal at said telephone interface by changing the off-hook signal to the on-hook signal at said telephone interface in order to prevent said telephone interface having no-disconnect supervision from remaining in the off-hook signal upon expiration of the configurable time period.

28. The method of claim 27 further wherein said timer lasts within a range of 2 to 3 minutes inclusive.

29. The method of claim 27 wherein said configurable packet data network further comprises an Internet Protocol (IP) network.

30. The method of claim 27 wherein said packet data network further comprises a Frame Relay network.

31. The method of claim 27 wherein said packet data network further comprises a High level Data Link Control (HDLC) network.

32. The method of claim 27 wherein said packet data network further comprises an Asynchronous Transfer Mode (ATM) network.

33. The method of claim 27 wherein said second telephone interface resides at a PBX.

34. The method of claim 27 wherein said second telephone interface resides at a central office (CO).