GB2415320A - Establishing a communication session either over PSTN or the Internet dependent upon certain criteria. - Google Patents
Establishing a communication session either over PSTN or the Internet dependent upon certain criteria. Download PDFInfo
- Publication number
- GB2415320A GB2415320A GB0426404A GB0426404A GB2415320A GB 2415320 A GB2415320 A GB 2415320A GB 0426404 A GB0426404 A GB 0426404A GB 0426404 A GB0426404 A GB 0426404A GB 2415320 A GB2415320 A GB 2415320A
- Authority
- GB
- United Kingdom
- Prior art keywords
- telecommunication
- telecommunication device
- analogue
- internet
- connectivity
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1069—Session establishment or de-establishment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5691—Access to open networks; Ingress point selection, e.g. ISP selection
- H04L12/5692—Selection among different networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1083—In-session procedures
- H04L65/1094—Inter-user-equipment sessions transfer or sharing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/0024—Services and arrangements where telephone services are combined with data services
- H04M7/0057—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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Business, Economics & Management (AREA)
- General Business, Economics & Management (AREA)
- Multimedia (AREA)
- General Engineering & Computer Science (AREA)
- Telephonic Communication Services (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention establishes a communication session between a first telephone 1 connected to an electronic device 2 and a second telephone 6. The first telephone 1 outputs a signal to the electronic device 2 that identifies the second telephone 76. The signal is used to obtain predetermined information about the second telephone 6 such as whether or not it is currently connected to the Internet, for example. A digital communication session can then be established between telephones 1 and 6 if the second telephone is connected to the Internet. Otherwise, an analogue communication session is established (over the Public Switched Telephone network (PSTN)). The telecommunication apparatus can be used to deliver voice calls to remote destinations over a digital or analogue network, and where the type of network that is used is selected based on the particular capabilities of the device on which the voice call is to be terminated.
Description
241 5320
TITLE
Telecommunication apparatus and method of operation
DESCRIPTION
Technical Field
The present invention provides a telecommunication apparatus that combines analogue and digital networks. More particularly, the telecommunication apparatus can be used to deliver voice calls to remote destinations over a digital or analogue network, and where the type of network that is used is selected based on the particular capabilities of the device on which the voice call is to be terminated.
Summary of the Invention
The present invention provides a method of establishing a communication session between a first telecommunication device connected to an electronic device and a second telecommunication device, the method including the steps of: outputting a signal from the first telecommunication device to the electronic device that identifies the second telecommunication device; using the signal to obtain predetermined information about the second telecommunication device; and establishing a digital communication session between the first telecommunication device and the second telecommunication device in which digital information is transmitted, or an analogue communication session between the first telecommunication device and the second telecommunication device where analogue information is transmitted, depending on the predetermined information.
The signal outputted from the first telecommunication device to the electronic device can be the network address of the second telecommunication device such as its telephone number, Ior example. The signal outputted from the first telecommunication device to the electronic device can include Dual-Tone Multi Frequency (DTMF) tones.
The step of using the signal to obtain predetermined information about the second telecommunication device can further include the steps of converting the signal to a numeric (or alpha-numeric) code; establishing a connection to the Internet; and checking if the numeric code matches a numeric code contained within a database of numeric codes.
The term "Internet" as used throughout refers to any network, either private or public, through which data can be transmitted from one computer or electronic device to 1 0 another.
If the numeric code matches a numeric code contained within the database then the method may further include the step of requesting the registration details that are associated with the numeric code. If the numeric code does not match a numeric code contained within the database then the electronic device will know that the second telecommunication device is not connected to the Internet and can establish an analogue communication session directly through the PSTN network. On the other hand, if the numeric code does match a numeric code contained within the database then the electronic device will know that there is the potential for the second communication device to be connected to the Internet. The registration details can include the personal details of the owner of the second telecommunication device, the telephone number of the second telecommunication device, the Internet Protocol (IP) address of the second telecommunication and an indication of whether or not the second telecommunication device is currently connected to the Internet, for example.
If the second telecommunication device is currently connected to the Internet then the electronic device can establish a digital communication session between the first and second communication devices. The digital communication session does not need to occupy the whole of the available bandwidth and some can therefore be retained for other purposes. The Internet can be used to exchange digital messages that are coded, encoded, delivered and received by application software associated with the electronic device connected to the first telecommunication device and with a similar electronic device connected to the second telecommunication device or with the second telecommunication device itself. The digital messages can be encoded from the voice messages (i.e. speech) provided by the users of the first and second telecommunication devices. On the other hand, if the second telecommunication device is not currently connected to the Internet then the electronic device can establish an analogue communication session between the first and second communication devices using the PSTN network.
It will therefore be readily appreciated that the predetermined information obtained using the signal can include an indication that the second telecommunication device is connected to the Internet and an indication that the second telecommunication device is not connected to the Internet (either because such a connection does not exist or is not currently being used).
The first and second telecommunication devices can be telephones, which can be mobile or fixed. The first and second telecommunication devices can also be computers, such as laptop computers for example, which are provided with a microphone and speaker system so that they can operate in the same way as a conventional telephone.
The electronic device can be a connectivity device that is connected to the first telecommunication device by an analogue or digital connection, to the Internet by a modem that provides a digital connection, and to the Public Subscriber Telephone Network (PSTN) by an analogue connection. The modem is preferably a Digital Subscriber Line (DSL) modem but any suitable modem can be used.
The connectivity device can include relays that are capable of opening and closing the analogue connection between the first telecommunication device and the PS-TN network.
The present invention further provides a telecommunication apparatus comprising: a first telecommunication device connected to a connectivity device; and a second telecommunication device; - 4 wherein the connectivity device is connected to the first telecommunication device by an analogue or digital connection, to the Internet by a modem that provides a digital connection, and to the Public Subscriber 'I'elephone Network (PSTN) by an analogue connection; and wherein the telecommunication apparatus further comprises means for determining if the second telecommunication device is connected to the Internet such that the connectivity device can establish a digital communication session between the first telecommunication device and the second telecommunication device in which digital information is transmitted if the second telecommunication device is connected to the Internet, or the connectivity device can establish an analogue communication session between the first telecommunication device and the second telecommunication device where analogue information is transmitted if the second telecommunication device is not connected to the Internet.
The connectivity device can further include relays that are capable of opening and closing the analogue connection between the first telecommunication device and the PSTN network. The modem is preferably a Digital Subscriber Line (DSL) modem but any suitable modem can be used.
The means for determining if the second telecommunication device is connected to the Internet can include a database (preferably hosted on the Internet) that can be accessed by the connectivity device using the modem.
The first telecommunication device can be operated to output a signal to the connectivity device that identifies the second telecommunication device. The signal outputted from the first telecommunication device to the connectivity device can be the network address of the second telecommunication device such as its telephone number, for example. The signal outputted l'rom the first telecommunication device to the connectivity device can include Dual-Tone Multi-Frequency (DTMF) tones. 5
The connectivity device can include means for converting the signal to a numeric (or alpha-numeric) code and for checking if the numeric code matches a numeric code contained within the database.
The second telecommunication device can be connected to the PSTN network, to a second connectivity device or directly to the Internet by a digital connection. In the latter case, it is generally preferred that a third telecommunication device is also provided and that this is connected to the PSTN network, either directly or through a second connectivity device. In the case where the second telecommunication device is connected to a second connectivity device, a fourth telecommunication device may also be connected to the second connectivity device.
The second connectivity device can be connected to the second telecommunication device by an analogue or digital connection, to the Internet by a modem (such as a Digital Subscriber Line (DSL) modem) that provides a digital connection, and to the Public Subscriber Telephone Network (PSTN) by an analogue connection.
The first, second and third telecommunication devices can be telephones, which can be mobile or fixed. The first and second telecommunication devices can also be computers, such as laptop computers for example, which are provided with a microphone and speaker system so that they can operate in the same way are a conventional telephone. If the second telecommunication device is a telephone then the fourth telecommunication device is preferably a computer, and vice versa. In this way, the second connectivity device can be connected to a telephone (using an analogue connection, for example) and to a computer (using a digital connection, for
example).
If the second telecommunication device is a computer, and it is connected directly to the Internet using a digital connection, then the computer may also function in the same way as the second connectivity device. In this way, the second connectivity device and the second telecommunication device are effectively combined together.
The computer may be adapted so that a telephone can be connected to it. 6
Drawing Figure l is a schematic diagram showing a telecommunication apparatus in accordance with a first embodiment of the present invention; and Figure 2 is a schematic diagram showing a telecommunication apparatus in accordance with a second embodiment of the present invention.
With reference to Figures l and 2, the telecommunication apparatus includes a first telephone l that is connected to a first connectivity device 2 using a common analogue connection. The connectivity device 2 includes a number of integrated functional components including.
An analogue connection to the telephone l.
A Digital Subscriber dine (DSL) modem which provides a digital connection to the Internet (shown schematically at 3). This connection has an associated network address that is an Internet Protocol (IP) address, which is static or dynamically allocated whenever the connection to the Internet 3 is established.
An analogue connection providing a connection to the Public Subscriber Telephone Network (PSTN) (shown schematically at 4). This analogue connection has an associated network address that is commonly referred to as a telephone number.
Relays that are capable of opening and closing the analogue connection between the telephone l and the PSTN network 4.
The connectivity device 2 is controlled by application software, the functionality of which is described in more detail below.
The telecommunication apparatus also includes a second telephone 5 that is connected to the PSTN network 4 using a standard analoguc connection.
In Figure l, a third telephone 6 is connected to a second connectivity device 7 using an analogue connection. The second connectivity device 7 is also connected using a - 7 digital connection to a laptop computer 8, which is capable of executing application software that can encode, decode, receive and deliver digital communication messages.
The laptop computer 8 is provided with a microphone and a speaker system (not shown) so that it can capture and transmit voice messages in the same way as a conventional telephone.
The telecommunication apparatus operates as follows.
A user will operate the first telephone I by lifting the receiver and entering the telephone number of the intended recipient of the call (the so-called "destination telephone number") into the associated keypad. The destination telephone number will be converted by the first telephone I into conventional Dual-Tone Multi Frequency (DTMF) tones, which are output on the analogue connection to the connectivity device 2. The DTMF tones are received by the connectivity device 2 where they are converted to a numeric code that represents the destination telephone number dialled by the user. This numeric code is then passed to the application software operating in the connectivity device 2. The application software will establish a connection to the Internet 3 using the DSL modem and request information such as registration details that are associated with the numeric code from a user database (shown schematically at 9).
If the destination telephone number is included in the user database 9 then the registration details will indicate if the intended recipient of the call is currently connected to the Internet 3. If the intended recipient is connected to the Internet 3 then the user database will supply details of the Internet Protocol (IP) address associated with the intended recipient's network connection. The application software assumes that the intended recipient has a connectivity device 7 that is connected to a telephone 6 and/or to a laptop computer 8. In this case, the application software will ensure that the relays of the connectivity device 2 are switched to a position where there is no communication channel established between the telephone I and the PSTN network 4. The application software will also establish a digital - 8 eommunication session through the Internet 3 to the IP address of the intended recipient that was retrieved from the user database 9. The application software will present a notification to the user that the Connectivity device 2 is attempting to establish a digital Communication session with the Connectivity device 7. The connectivity device 7 will also present a notification to the intended recipient that an attempt is being made to establish a digital communication session. The user and the intended recipient will continue to receive such notifications until the intended recipient accepts the incoming call (by picking up the receiver of the telephone 6, for example), or the user terminates the attempt to establish the digital communication session (by replacing the receiver on the telephone 1, for example).
If the intended recipient accepts the incoming call then a digital communication session will be established according to the following general principles.
Voice messages (i.e. speech) provided by the user will be encoded to digital messages by the application software using a conversion protocol that is known to the connectivity device 2 and to the connectivity device 7. These digital messages are transferred through the Internet 3 to the connectivity device 7 associated with the destination telephone number. The connectivity device 7 associated with the destination telephone number will decode the digital message signal and present the output as a voice message to the intended recipient through the telephone 6.
The reverse process is used to transmit voice messages provided by the intended recipient back to the user.
The digital Communication session will continue until terminated by either of the connectivity devices 2 and 7. For example, if the user replaces the receiver on the telephone 1, the application software operating in the connectivity device 2 will terminate the digital communication session between the connectivity devices 2 and 7.
If the application software operating in the connectivity device 2 determines that the destination telephone number is not included in the user database 9, or if the Internet - 9 - connection associated with the destination telephone number is not currently available, the application software will ensure that the relays of the connectivity device 2 are switched to a position where a communication channel is established between the telephone l and the PSTN network 4. The DTMF digits received from the telephone l are then transmitted by the connectivity device 2 through the analogue connection associated with the PSTN network 4 to establish a direct connection between the telephone l and the PSTN network through which a communication session can take place in the usual way. In the case where the destination telephone number is not included in the user database 9, the communication session will take place using the telephone 5 that is connected directly to the PSTN network. In the case where the destination telephone number is included in the user database 9 but an Internet connection associated with the destination telephone number is not currently available, the communication session will take place using the telephone 6 and the application software operating in the connectivity device 7 will ensure that the relays of the connectivity device 7 are switched to a position where a communication channel is established between the telephone 6 and the PSTN network 4. The communication session can also take place using the telephone 5 if the intended recipient has a direct connection to the PSTN network 4.
With reference to Figure 2, the laptop computer 8 is connected directly to the Internet 3. If the destination telephone number is included in the user database 9 and an Internet connection associated with the destination telephone number is currently available then a digital communication session will be established between the first connectivity device 2 and the laptop computer 8. However, if this is not possible, then a communication channel will be established between the telephone l and the telephone 5 using the PS l N network 4. 1
Claims (30)
1. A method of establishing a communication session between a first telecommunication device connected to an electronic device and a second telecommunication device, the method including the steps of: outputting a signal from the first telecommunication device to the electronic device that identifies the second telecommunication device; using the signal to obtain predetermined information about the second telecommunication device; and establishing a digital communication session between the first telecommunication device and the second telecommunication device in which digital information is transmitted, or an analogue communication session between the first telecommunication device and the second telecommunication device where analogue information is transmitted, depending on the predetermined information.
2. A method according to claim 1, wherein the signal outputted from the first telecommunication device to the electronic device is the network address of the second telecommunication device.
3. A method according to claim 2, wherein the network address of the second telecommunication device is a telephone number.
4. A method according to any preceding claim, wherein the signal outputted from the first telecommunication device to the electronic device includes DTMF tones.
5. A method according to any preceding claim, wherein the step of using the signal to obtain predetermined information about the second telecommunication device further includes the steps of: converting the signal to a numeric code; establishing a connection to the Internet; and checking if the numeric code matches a numeric code contained within a database of numeric codes. l'
6. A method according to claim 5, wherein the step of using the signal to obtain predetermined information about the second telecommunication device further includes the step of requesting the registration details that are associated with the numeric code if the numeric code matches a numeric code contained within the database.
7. A method according to claim 6, wherein the registration details that are associated with the numeric code includes an indication of whether or not the second telecommunication device is connected to the Internet.
8. A method according to claim 7, wherein a digital communication session is established between the first telecommunication device and the second telecommunication device if the registration details that are associated with the numeric code indicates that second telecommunication device is connected to the Internet.
9. A method according to claim 7 or claim 8, wherein an analogue communication session is established between the first telecommunication device and the second telecommunication device if the numeric code does not match a numeric code contained within the database, or if the registration details that are associated with the numeric code indicates that the second telecommunication device is not connected to the Internet.
10. A method according to any preceding claim, wherein the digital communication session established between the first telecommunication device and the second telecommunication device uses the Internet.
11. A method according to any preceding claim, wherein the analogue communication session established between the first telecommunication device and the second telecommunication device uses a Public Subscriber Telephone Network (PSTN).
12. A method according to any preceding claim, wherein the first and second telecommunication devices are telephones.
13. A method according to any preceding claim, wherein the first and second telecommunication devices are computers provided with a microphone and speaker system.
14. A method according to any preceding claim, wherein the electronic device is a connectivity device that is connected to the first telecommunication device by an analogue or digital connection, to the Internet by a modem that provides a digital connection, and to the Public Subscriber Telephone Network (PSTN) by an analogue connection.
15. A method according to claim 14, wherein the connectivity device includes relays that are capable of opening and closing the analogue connection between the first telecommunication device and the PSTN network.
16. A telecommunication apparatus comprising: a first telecommunication device connected to a connectivity device; and a second telecommunication device; wherein the connectivity device is connected to the first telecommunication device by an analogue or digital connection, to the Internet by a modem that provides a digital connection, and to the Public Subscriber Telephone Network (PSTN) by an analogue connection; and wherein the telecommunication apparatus further comprises means for determining if the second telecommunication device is connected to the Internet such that the connectivity device can establish a digital communication session between the first telecommunication device and the second telecommunication device in which digital information is transmitted if the second telecommunication device is connected to the Internet, or the connectivity device can establish an analogue communication session between the first telecommunication device and the second telecommunication device where analogue information is transmitted if the second telecommunication device is not connected to the Internet.
17. A telecommunication apparatus according to claim 16, wherein the connectivity device further includes relays that are capable of opening and closing the analogue connection between the first telecommunication device and the PSTN network.
18. A telecommunication apparatus according to claim 16 or claim 17, wherein the means for determining if the second telecommunication device is connected to the Internet includes a database that can be accessed by the connectivity device using the DSI, modem.
19. A telecommunication apparatus according to claim 18, wherein the first telecommunication device can be operated to output a signal to the connectivity device that identifies the second telecommunication device.
20. A telecommunication apparatus according to claim 19, wherein the signal outputted from the first telecommunication device to the connectivity device is the network address of the second telecommunication device.
21. A telecommunication apparatus according to claim 20, wherein the network address of the second telecommunication device is a telephone number.
23. A telecommunication apparatus according to any of claims 19 to 21, wherein the signal outputted from the first telecommunication device to the connectivity device includes DTMF tones.
23. A telecommunication apparatus according to any of claims 19 to 22, wherein the connectivity device includes means for converting the signal to a numeric code and for checking if the numeric code matches a numeric code contained within the database. 1 -
24. A telecommunication apparatus according to any of claims 16 to 23, wherein the second telecommunication device is connected to the PSTN network.
25. A telecommunication apparatus according to any of claims 16 to 23, wherein the second telecommunication device is connected to a second connectivity device.
26. A telecommunication apparatus according to claim 24, wherein the second connectivity device is connected to the second telecommunication device by an analogue or digital connection, to the Internet by a modem that provides a digital connection, and to the Public Subscriber Telephone Network (PSTN) by an analogue connection.
27. A telecommunication apparatus according to any of claims 16 to 26, wherein the first and second telecommunication devices are telephones.
28. A telecommunication apparatus according to any of claim 16 to 26, wherein the first and second telecommunication devices are computers provided with a microphone and speaker system.
29. A telecommunication apparatus according to any of claims 26 to 28, further comprising a third telecommunication device connected to the second connectivity device by an analogue or digital connection.
30. A telecommunication apparatus substantially as herein described and with reference to Figure 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB0413294.0A GB0413294D0 (en) | 2004-06-15 | 2004-06-15 | Telephone system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0426404D0 GB0426404D0 (en) | 2005-01-05 |
| GB2415320A true GB2415320A (en) | 2005-12-21 |
Family
ID=32732504
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB0413294.0A Ceased GB0413294D0 (en) | 2004-06-15 | 2004-06-15 | Telephone system |
| GB0426404A Withdrawn GB2415320A (en) | 2004-06-15 | 2004-12-02 | Establishing a communication session either over PSTN or the Internet dependent upon certain criteria. |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB0413294.0A Ceased GB0413294D0 (en) | 2004-06-15 | 2004-06-15 | Telephone system |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB0413294D0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2431317A (en) * | 2005-04-10 | 2007-04-18 | Mainframe Systems Ltd | Automatic VoIP / PSTN call transfer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0920176A2 (en) * | 1997-12-01 | 1999-06-02 | Nortel Networks Corporation | Automatic backup trunking for voice over the internet |
| WO1999038310A1 (en) * | 1998-01-27 | 1999-07-29 | Thomson Licensing S.A. | Call setup for ip/internet telephony |
| EP0959593A2 (en) * | 1998-05-20 | 1999-11-24 | AT&T Corp. | Method of completing long distance POTS calls with IP telephony endpoints |
| WO2001071994A1 (en) * | 2000-03-20 | 2001-09-27 | Interconware, Inc. | Method and system for telephone communication |
| EP1235416A1 (en) * | 2000-10-26 | 2002-08-28 | Mitsubishi Denki Kabushiki Kaisha | Internet telephone network system, network access method and talking device adapter |
| US20030076933A1 (en) * | 1998-06-05 | 2003-04-24 | Netnumber.Com, Inc. | Method and apparatus for correlating a unique identifier, such as a PSTN telephone number, to an internet address to enable communications over the internet |
| US20030152066A1 (en) * | 2002-02-13 | 2003-08-14 | International Business Machines Corporation | Net-aware telephone switch |
-
2004
- 2004-06-15 GB GBGB0413294.0A patent/GB0413294D0/en not_active Ceased
- 2004-12-02 GB GB0426404A patent/GB2415320A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0920176A2 (en) * | 1997-12-01 | 1999-06-02 | Nortel Networks Corporation | Automatic backup trunking for voice over the internet |
| WO1999038310A1 (en) * | 1998-01-27 | 1999-07-29 | Thomson Licensing S.A. | Call setup for ip/internet telephony |
| EP0959593A2 (en) * | 1998-05-20 | 1999-11-24 | AT&T Corp. | Method of completing long distance POTS calls with IP telephony endpoints |
| US20030076933A1 (en) * | 1998-06-05 | 2003-04-24 | Netnumber.Com, Inc. | Method and apparatus for correlating a unique identifier, such as a PSTN telephone number, to an internet address to enable communications over the internet |
| WO2001071994A1 (en) * | 2000-03-20 | 2001-09-27 | Interconware, Inc. | Method and system for telephone communication |
| EP1235416A1 (en) * | 2000-10-26 | 2002-08-28 | Mitsubishi Denki Kabushiki Kaisha | Internet telephone network system, network access method and talking device adapter |
| US20030152066A1 (en) * | 2002-02-13 | 2003-08-14 | International Business Machines Corporation | Net-aware telephone switch |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2431317A (en) * | 2005-04-10 | 2007-04-18 | Mainframe Systems Ltd | Automatic VoIP / PSTN call transfer |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0413294D0 (en) | 2004-07-14 |
| GB0426404D0 (en) | 2005-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |