Computer telephony integration adapter

• US 20040218583A1
• Filed: 04/30/2003
• Published: 11/04/2004
• Est. Priority Date: 04/30/2003
• Status: Active Grant

• Current Assignee: JP Morgan Chase Bank, N.A. (JP Morgan Chase & Co)
• Original Assignee: Microsoft Corporation
• Inventors: Adan, Manolito E., Van Flandern, Michael W.
• Granted Patent: US 7,567,549 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• CPC Class Codes: H04L 65/1026 at the edge
• CPC Class Codes: H04L 65/1036 at the edge
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04M 1/2473 Telephone terminals interfacing a personal computer, e.g. using an API (Application Programming Interface) details of API H04M7/0021
• CPC Class Codes: H04M 1/2535 adapted for voice communication over an Internet Protocol [IP] network Voice over Internet Protocol (VoIP) network equipment and services H04M7/006; implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP] H04L69/16
• CPC Class Codes: H04M 3/42323 PBX's with CTI arrangements
• CPC Class Codes: H04M 7/0015 First party call control architectures

Abstract

A computer telephony interface adapter (CTIA) for interfacing a computing device, a telephone, and a telephone network. The CTIA communicates with the telephone network using a telephone network protocol, such as a PSTN or a PBX protocol. Also, the CTIA communicates with a POTS telephone or a PBX telephone according to the telephone network protocol and with the computing device according to a data communication protocol, such as a USB or wireless protocol. The CTIA includes a controller in communication with the telephone network, the telephone, and the computing device. The controller converts communications between the telephone network protocol and the data communication protocol. In addition, the controller selectively couples the telephone into communication with the telephone network and the computing device at the same time. Thus, the CTIA enables local control over real-time shared communication among the telephone, telephone network, and computing device.

Claims

1. A computer telephony interface adapter (CTIA) for interfacing a computing device, a telephone, and a telephone network, comprising:

(a) a telephone network interface for communicating with the telephone network according to a telephone network protocol;

(b) a telephone interface for communicating with the telephone;

(c) a computer interface for communicating with the computing device according to a data communication protocol;

(d) a controller in communication with the telephone network interface and with the computer interface, said controller converting between the telephone network protocol and the data communication protocol; and

(e) a switch that selectively couples the telephone in communication with the telephone network and the computing device at the same time.

2. The CTIA of claim 1, wherein the computer interface comprises one of:

(a) a universal serial bus (USB) interface; and

(b) a wireless communication interface.

3. The CTIA of claim 1, wherein the controller comprises one of:

(a) a coder/decoder for converting between digital signals and analog telephone network signals; and

(b) a multiplexer for multiplexing data for communication with a private branch exchange (PBX) telephone network.

4. The CTIA of claim 3, wherein the coder/decoder includes a subscriber line interface circuit (SLIC) and an analog telephone power source.

5. The CTIA of claim 4, wherein the coder/decoder further includes:

(a) an audio coder/decoder that converts audio signals between the telephone network protocol and the data communication protocol; and

(b) a signaling controller that converts signaling data between the telephone network protocol and the data communication protocol.

6. The CTIA of claim 1, wherein the controller detects an interruption in communication between the computer interface and the computing device and causes the switch to couple the telephone in communication only with the telephone network.

7. The CTIA of claim 1, further comprising a transformer having a first winding and a second winding, wherein the first winding of the transformer is in communication with the controller and the second winding of the transformer is in communication with the telephone network interface, to provide electrical isolation between the controller and the and the telephone network interface, while enabling communication.

8. The CTIA of claim 1, further comprising a hook switch coupled to the controller, the telephone network interface, and a hold circuit, said controller controlling the hook switch to selectively couple an input of the controller to one of the telephone network interface and the hold circuit, so that when the hook switch is selectively controlled by the controller to couple the controller input to the telephone network interface, communication can occur between the computing device and the telephone network.

9. The CTIA of claim 1, further comprising a frequency shift keying (FSK) decoder in communication with the telephone network interface and in communication with the controller, said FSK decoder decoding FSK data from signals received from the telephone network interface, and said FSK decoder providing the FSK data to the controller for communication to the computing device.

10. The CTIA of claim 1, further comprising at least one of:

(a) an off hook detector in communication with the switch and with the controller, said off hook detector detecting an off hook state of the telephone and notifying the controller of the off hook state; and

(b) a ring detector in communication with the telephone network interface and in communication with the controller, said ring detector detecting a ring signal from the telephone network and notifying the controller of the ring signal.

11. The CTIA of claim 1, wherein the telephone network interface comprises one of:

(a) an analog line protection circuit for communicating according to an analog telephone network protocol; and

(b) a PBX interface for communicating according to a digital telephone network protocol.

12. The CTIA of claim 1, further comprising at least one of:

(a) a wide area network (WAN) interface in communication with the computer interface to enable communication between the computing device and a WAN; and

(b) a local area network (LAN) interface in communication with the computer interface to enable communication between the computing device and a LAN.

13. The CTIA of claim 1, wherein the telephone interface comprises one of:

(a) a conductor connecting the telephone interface in communication with the telephone; and

(b) a wireless interface for wirelessly coupling the telephone interface in communication with the telephone.

14. A method for selectively coupling signaling data and audio signals among a telephone, a telephone network, and a computing device, the method comprising the steps of:

(a) establishing communication between the telephone and the telephone network through a computer telephony integration adapter (CTIA) over a telephone-to-telephone network (T-TN) communication path between the telephone and the telephone network, said T-TN communication path enabling communication of the signaling data and audio signals according to telephone network protocols;

(b) establishing communication between the telephone and the computing device through the CTIA over a telephone-to-computer (T-C) communication path between the telephone and the computing device, said T-C communication path including a converter that converts the signaling data and audio signals between the telephone network protocols and data communication protocols used by the computing device; and

(c) establishing communication between the T-TN communication path and the T-C communication path so that the signaling data and the audio signals on the T-TN path are processed by the converter, thereby enabling sharing of the signaling data and the audio signals among the telephone, the computing device, and the telephone network.

15. The method of claim 14, wherein the step of establishing communication between the telephone and the telephone network comprises the step of establishing outgoing communications, said step of establishing outgoing communications comprising the steps of:

(a) detecting on off hook status of the telephone with the CTIA;

(b) causing the CTIA to notify the computing device of the off hook status;

(c) communicating dual tone multi-frequency (DTMF) signals along the T-C communication path to the computing device;

(d) communicating the DTMF signals along the T-TN communication path to the telephone network; and

(e) communicating signaling data and audio signals received from the telephone network, indicating that a call is established, to the telephone through the telephone network, along the T-TN communication path.

16. The method of claim 14, wherein the step of establishing communication between the telephone and the telephone network comprises the step of establishing incoming communications, said step of establishing incoming communications comprising the steps of:

(a) detecting a ring signal with the CTIA;

(b) causing the CTIA to notify the computing device of the ring signal; and

(c) receiving signaling data and audio signals from the telephone network along the T-TN communication path, when the telephone is set to an off hook state.

17. The method of claim 16, wherein the step of establishing incoming communication further comprises the steps of:

(a) decoding frequency shift keying (FSK) signaling data from the telephone network to produce decoded FSK data; and

(b) causing the CTIA to communicate the decoded FSK data to the computing device.

18. The method of claim 14, wherein the step of decoding the FSK signaling data comprises the steps of:

(a) detecting a high FSK signal;

(b) starting a timer;

(c) detecting a transition to a low FSK signal;

(d) determining a time between starting the timer and detecting the transition to the low FSK signal;

(e) determining that an FSK bit is a 1 if the time is greater than zero; and

(f) determining that an FSK bit is a 0 if the time is one of less than and equal to zero.

19. The method of claim 14, wherein the step of establishing communication between the telephone and the computing device comprises the steps of:

(a) causing a request to be made for data communication between the computing device and the CTIA, said request conforming to the data communication protocols;

(b) establishing the data communication that was requested; and

(c) providing power in conformance with the telephone network protocols to the telephone, through the T-TN communication path between the converter and the telephone, said power energizing the telephone independent of the telephone network.

20. The method of claim 19, further comprising the steps of:

(a) detecting an interruption in the data communication between the computing device and the CTIA;

(b) suspending the communication between the telephone and the computing device through the CTIA over the telephone-to-computer (T-C) communication path; and

(c) providing an indication that the communication between the telephone and the computing device is interrupted.

21. The method of claim 14, further comprising the step of establishing a voice over Internet protocol (VOIP) communication, while maintaining a communication among the telephone, the telephone network, and the computing device with the CTIA.

22. The method of claim 14, further comprising the step of switching the communication of the signaling data and audio signals for the telephone network to a hold state, thereby suspending communication of the signaling data and audio signals between the telephone network and one or both of the telephone and the computing device.

23. A memory medium on which machine instructions are stored for carrying out the steps of claim 14.

24. A computer telephony interface adapter (CTIA) for interfacing a telephone, a telephone network, and a computing device, comprising:

(a) a telephone-to-telephone network (T-TN) communication path, enabling communication of signaling data and audio signals according to telephone network protocols between a telephone and a telephone network;

(b) a telephone-to-computer (T-C) communication path enabling communication of signaling data and audio signals between the telephone and a computing device, said T-C communication path including a converter that converts the signaling data and audio signals between the telephone network protocols and data communication protocols used by a computing device;

(c) a computer-to-telephone network (C-TN) communication path enabling communication of signaling data and audio signals between the computing device and the telephone network, said C-TN communication path using the converter that converts the signaling data and audio signals between the telephone network protocols and data communication protocols used by the computing device; and

(d) a common connection coupling the T-TN communication path, the T-C communication path, and the C-TN communication path, to enable sharing of the signaling data and audio signals among a telephone, a telephone network, and a computing device.

25. A method of controlling communication of signaling data and audio signals among a telephone, a telephone network, and a computing device, by executing machine instructions on the computing device, said machine instructions causing the computing device to carry out the steps of:

(a) communicating an off hook instruction to a computer telephony integration adapter (CTIA) according to a data communication protocol, causing the CTIA to initiate communication with the telephone network according to a telephone network protocol;

(b) communicating a telephone number to the CTIA according to the data communication protocol, causing the CTIA to convert the telephone number into a sequence of dual tone multi-frequency (DTMF) signals that are communicated to the telephone network according to the telephone network protocol, to place a telephone call;

(c) receiving signaling data and audio signals for the telephone call from the CTIA, wherein the signaling data and audio signals conform to the data communication protocol; and

(e) communicating a switch instruction to the CTIA, causing the CTIA to connect a shared communication path among the telephone, the telephone network, and the computing device.

26. A method of detecting a data value from a frequency shift keying (FSK) signal, comprising the steps of:

(a) detecting a high FSK signal;

(b) starting a timer with a timeout that is that is substantially equal to a period of time used to transmit a signal pulse corresponding to a bit of FSK data;

(c) detecting a transition to a low FSK signal;

(d) determining a time between starting the timer and detecting the transition to the low FSK signal;

(e) determining that an FSK bit is a 1 if the time is greater than zero; and

(f) determining that an FSK bit is a 0 if the time is one of less than and equal to zero.