Quick connect internet telephone and method therefor

• US 6,519,250 B1
• Filed: 04/16/1999
• Issued: 02/11/2003
• Est. Priority Date: 04/16/1999
• Status: Expired due to Fees

• Current Assignee: Fanstel Systems, LLC
• Original Assignee: Fanstel Systems, LLC
• Inventors: Fan, Yuan-Neng
• Primary Examiner(s): Yao, Kwang Bin
• Assistant Examiner(s): JONES, PRENELL P
• Application Number:
  US09/293,106
• Time in Patent Office: 1,397 Days
• Field of Search: 370/914, 370/352, 370/356, 370/480-493, 370/206, 370/515, 370/420, 370/467-468, 370/345, 370/319, 375/222, 375/148, 379/93.05, 379/399.01, 379/414
• US Class Current: 370/352
• 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 2203/2066 Call type detection of indication, e.g. voice or fax, mobile of fixed, PSTN or IP
• CPC Class Codes: H04M 7/0057 Services where the data services network provides a telephone service in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network
• 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

An internet telephone system uses a Public Switched Telephone Network (PSTN). An internet network is coupled to the PSTN. At least two telephone stations are part of the system wherein one of the at least two telephone stations is a DSL telephone station which is coupled to the PSTN. The DSL telephone station has a Plain Old Telephone Set (POTS) splitter coupled to the PSTN for directing low frequency signals to a first line and DSL signals to a second line. A DSL line interface is coupled to the POTS splitter for driving and terminating the second line. A DSL transmitter is coupled to the DSL line interface. A DSL receiver is also coupled to the DSL line interface. A Digital Signal Processor (DSP) is coupled to the DSL transmitter and the DSL receiver. A telephone interface is coupled to the first line. An audio transceiver device is coupled to the telephone interface. A CODEC circuit is also coupled to the telephone interface. A ring and hook detect/control circuitry is coupled to the DSP.

Claims

1. A quick connect internet telephone station comprising, in combination:

a Plain Old Telephone Set (POTS) splitter coupled to a public switched telephone network (PSTN) for directing low frequency signals to a first line and DSL signals to a second line;

a DSL line interface coupled to said POTS splitter for driving and terminating said second line;

a DSL transmitter coupled to said DSL line interface;

a DSL receiver coupled to said DSL line interface;

a Digital Signal Processor (DSP) coupled to said DSL transmitter and said DSL receiver;

a telephone interface coupled to said first line;

an audio transceiver device coupled to said telephone interface;

a CODEC circuit coupled to said telephone interface; and

ring and hook detect/control circuitry coupled to said DSP.

2. A quick connect internet telephone station in accordance with claim 1 wherein said POTS splitter comprises:

a low pass filter coupled to said PSTN for directing said low frequency signals to said first line; and

a high pass filter coupled to said PSTN for directing said DSL signals to said second line.

3. A quick connect internet telephone station in accordance with claim 2 wherein said low pass filter provides a band pass for voice frequency signals, dial tone signals, ringing signals, and on/off hook signals.

4. A quick connect internet telephone station in accordance with claim 2 wherein said high pass filter is used for directing ADSL signals to said second line.

5. A quick connect internet telephone station in accordance with claim 1 wherein said DSL transmitter is for receiving a data from said DSP and converting said data into analog signals for transmission.

6. A quick connect internet telephone station in accordance with claim 5 wherein said DSL transmitter is further used for mapping said data from said DSP into multibit subchannels, converting said multibit subchannels into time domain signals, converting said time domain signals into serial signals, and converting said serial signals into said analog signals for transmission.

7. A quick connect internet telephone station in accordance with claim 1 wherein said DSL receiver is used for converting said DSL signal to an output bit stream and for sending said output bit stream to said DSP.

8. A quick connect internet telephone station in accordance with claim 7 wherein said DSL receiver is further used for converting said DSL signal into multiple channels;

converting each of said multiple channels into frequency domain signals; and

running each of said multiple channels through symbol decision functions, bit decision functions, and invert bit parsing functions for sending said output bit stream to said DSP.

9. A quick connect internet telephone station in accordance with claim 1 wherein said DSP comprises:

a signal selector coupled to said DSL transmitter, said DSL receiver, and to said CODEC;

a packet assembler-dissassember coupled to said signal selector;

a Dual Tone Multi-Frequency (DTMF) generator coupled to said signal generator;

a Call Progress (CP) detector coupled to said signal generator;

a MODEM transmitter-receiver coupled to said signal selector; and

a data compressor-decompressor coupled to said signal selector.

10. A quick connect internet telephone station in accordance with claim 1 wherein said audio transceiver comprises:

a speaker coupled to said telephone interface; and

a microphone coupled to said telephone interface.

11. A quick connect internet telephone station in accordance with claim 1 wherein said ring and hook detect circuitry comprises:

a ring detector coupled to said DSP; and

an off-hook detector coupled to said DSP.

12. A quick connect internet telephone station in accordance with claim 11 wherein said ring and hook detect circuitry further comprises:

a ringer coupled to said DSP; and

a hook switch coupled to said DSP.

13. A quick connect internet telephone station in accordance with claim 1 further comprising memory coupled to said DSP.

14. A quick connect internet telephone station in accordance with claim 13 wherein said memory comprises:

flash memory coupled to said DSP; and

Random Access Memory (RAM) coupled to said DSP.

15. A quick connect internet telephone station in accordance with claim 1 further comprising a keypad.

16. A quick connect internet telephone station in accordance with claim 1 further comprising a visual display mechanism.

17. A quick connect internet telephone station in accordance with claim 16 wherein said visual display mechanism is an LCD display.

18. A quick connect internet telephone station in accordance with claim 16 wherein said visual display mechanism is an LED display.

19. An internet telephone system comprising, in combination:

a Public Switched Telephone Network (PSTN);

an internet network coupled to said PSTN; and

at least two telephone stations wherein at one of said at least two telephone stations is a DSL telephone station coupled to said PSTN wherein said at least one DSL telephone comprises;

a Plain Old Telephone Set (POTS) splitter coupled to said PSTN for directing low frequency signals to a first line and DSL signals to a second line;

a DSL line interface coupled to said POTS splitter for driving and terminating said second line;

a DSL transmitter coupled to said DSL line interface;

a DSL receiver coupled to said DSL line interface;

a DSP coupled to said DSL transmitter and said DSL receiver;

a telephone interface coupled to said first line;

an audio transceiver device coupled to said telephone interface;

a CODEC circuit coupled to said telephone interface; and

ring and hook detect/control circuitry coupled to said DSP.

20. A quick connect internet telephone station in accordance with claim 19 wherein said POTS splitter comprises:

a low pass filter coupled to said PSTN for directing said low frequency signals to said first line; and

a high pass filter coupled to said PSTN for directing said DSL signals to said second line.

21. A quick connect internet telephone station in accordance with claim 20 wherein said low pass filter provides a band pass for voice frequency signals, dial tone signals, ringing signals, and on/off hook signals.

22. A quick connect internet telephone station in accordance with claim 20 wherein said high pass filter is used for directing ADSL signals to said second line.

23. A quick connect internet telephone station in accordance with claim 19 wherein said DSL transmitter is for receiving a data from said DSP and converting said data into analog signals for transmission.

24. A quick connect internet telephone station in accordance with claim 23 wherein said DSL transmitter is further used for mapping said data from said DSP into multibit subchannels, converting said multibit subchannels into time domain signals, converting said time domain signals into serial signals, and converting said serial signals into said analog signals for transmission.

25. A quick connect internet telephone station in accordance with claim 19 wherein said DSL receiver is used for converting said DSL signal to an output bit stream and for sending said output bit stream to said DSP.

26. A quick connect internet telephone station in accordance with claim 25 wherein said DSL receiver is further used for converting said DSL signal into multiple channels;

converting each of said multiple channels into frequency domain signals; and

running each of said multiple channels through symbol decision functions, bit decision functions, and invert bit parsing functions for sending said output bit stream to said DSP.

27. A quick connect internet telephone station in accordance with claim 19 wherein said DSP comprises:

a signal selector coupled to said DSL transmitter, said DSL receiver, and to said CODEC;

a packet assembler-dissassember coupled to said signal selector;

a Dual Tone Multi-Frequency (DTMF) generator coupled to said signal generator;

a Call Progress (CP) detector coupled to said signal generator;

a MODEM transmitter-receiver coupled to said signal selector; and

a data compressor-decompressor coupled to said signal selector.

28. A quick connect internet telephone station in accordance with claim 19 wherein said ring and hook detect circuitry comprises:

a ring detector coupled to said DSP;

an off-hook detector coupled to said DSP;

a ringer coupled to said DSP; and

a hook switch coupled to said DSP.

29. A quick connect internet telephone station in accordance with claim 19 further comprising memory coupled to said DSP.

30. A quick connect internet telephone station in accordance with claim 19 further comprising a keypad.

31. A quick connect internet telephone station in accordance with claim 19 further comprising a visual display mechanism.

32. A quick connect internet telephone station in accordance with claim 31 wherein said visual display mechanism is an LCD display.

33. A quick connect internet telephone station in accordance with claim 31 wherein said visual display mechanism is an LED display.

48. An internet telephone system in accordance with claim 19 wherein said at least two telephone stations further comprises at least two telephone stations further comprises a second DSL telephone station coupled to said PSTN.

49. An internet telephone system in accordance with claim 19 wherein said at least two telephone stations further comprises an internet telephone coupled to said PSTN.

50. An internet telephone system in accordance with claim 19 wherein said at least two telephone stations further comprises a Plain Old Telephone Set (POTS).

34. A method for using a first DSL telephone for a making telephone call comprising the steps of:

dialing a desired telephone number from said first DSL telephone via a telephone network;

determining type of telephone set at said desired telephone number;

routing said telephone call through an internet network when said first DSL telephone recognizes said telephone set of said desired telephone number is one of an internet telephone or a second DSL telephone; and

routing said call through said telephone network when said first DSL telephone recognizes said telephone set of said desired telephone number is a POTS telephone.

35. The method of claim 34 wherein said step of dialing a desired telephone number from a first DSL telephone via a telephone network further comprises the steps of:

detecting a hook switch off-hook signal by said first DSL telephone;

entering said desired telephone number into said first DSL telephone;

sending an off-hook signal by said first DSL telephone; and

sending said desired telephone number to said telephone network.

36. The method of claim 35 further comprising the step of searching a data base of said first DSL telephone for said desired telephone number.

37. The method of claim 34 wherein said step of determining type of telephone set at said desired telephone number comprises the steps of:

detecting of a ringing tone of a telephone set of said desired telephone number by said first DSL telephone;

recognizing said telephone set of said desired telephone number is one of an internet telephone or a second DSL telephone if only a single ringing tone is detected; and

recognizing said telephone set of said desired telephone number is a POTS telephone if more than a single ringing tone is detected.

38. The method of claim 37 wherein said step of recognizing said telephone set of said desired telephone number is one of an internet telephone or a second DSL telephone if only a single ringing tone is detected further comprises the steps of:

automatically answering of said telephone set of said desired telephone number after only a single ringing tone; and

identifying said telephone set of said desired telephone number is a second DSL telephone by said first DSL telephone.

39. The method of claim 38 further comprising the steps of:

establishing a direct modem transmission; and

transferring of identification information of said first DSL telephone and said second DSL telephone.

40. The method of claim 39 wherein said step of transferring of identification information further comprises the step of transferring name of both parties, telephone number of both parties, Internet Provider (IP) address of both parties, and telephone type of both parties.

41. The method of claim 40 wherein said step of routing said call through an internet network further comprises the steps of:

sending START_VOICE_SIGNAL and said identification information from said first DSL telephone to IP address of said second DSL telephone via DSL link to said internet network;

sending READY_VOICE_SIGNAL from said second DSL telephone;

establishing voice communication through said internet network via DSL lines; and

terminating said telephone call on completion of said telephone call.

42. The method of claim 41 wherein said step of terminating said telephone call further comprises the steps of:

detection of hook switch on-hook signal;

termination of sending of voice packets; and

sending of END_VOICE_SIGNAL to IP address of said second DSL telephone.

43. The method of claim 37 wherein said step of recognizing said telephone set of said desired telephone number is one of an internet telephone or a second DSL telephone if only a single ringing tone is detected further comprises the steps of:

automatically answering of said telephone set of said desired telephone number after only a single ringing tone; and

identifying said telephone set of said desired telephone number is an internet telephone by said first DSL telephone.

44. The method of claim 43 further comprising the steps of:

establishing a direct modem transmission; and

transferring of identification information of said first DSL telephone and to said internet telephone.

45. The method of claim 44 wherein said step of transferring of identification information further comprises the step of transferring name of both party, telephone number of party, Internet Provider (IP) address of party, and telephone type of party.

46. The method of claim 44 wherein said step of routing said call through an internet network further comprises the steps of:

dialing of IP telephone number by said internet telephone;

sending beginning-of-conversation signal to IP address of said DSL telephone;

establishing voice communication path; and

terminating said telephone call on completion of said telephone call.

47. The method of claim 46 wherein said step of establishing voice communication path further comprises the steps of:

detection of a hook switch off-hook signal;

sending packetized voice signal; and

converting of voice data into analog signals to establish voice communication path.