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
  • H04L65/10—Architectures or entities
  • H04L65/102—Gateways
  • H04L65/1023—Media gateways
  • H04L65/1026—Media gateways at the edge
• • 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
  • H04L65/10—Architectures or entities
  • H04L65/102—Gateways
  • H04L65/1033—Signalling gateways
  • H04L65/1036—Signalling gateways at the edge
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/253—Telephone sets using digital voice transmission
  • H04M1/2535—Telephone sets using digital voice transmission adapted for voice communication over an Internet Protocol [IP] network
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/71—Substation extension arrangements
  • H04M1/715—Substation extension arrangements using two or more extensions per line
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M7/00—Arrangements for interconnection between switching centres
  • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
  • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
  • H04M7/125—Details of gateway equipment

Definitions

• a system for automatically switching between analoque and IP telephony
• the present invention relates to a system for automatically switching between analogue telephony and IP telephony, customer apparatus incorporating the system, an adapter card for implementing the system suitable for insertion in a
• PC a PC incorporating the adapter card and a method of switching between analogue and IP telephony.
• a system for use of both IP telephony and switched circuit analogue telephony should automatically switch between IP and circuit switched telephony, i.e. there should be no need for manual switching between regular ( telephony and IP telephony.
• the switching should employ a software implementation.
• the present invention achieves a solution to the problem presented above, by using a dialled prefix digit to switch from a preselected form of telephony, e.g. circuit switched telephony, to the other form of telephony, e.g. IP telephony.
• the invention may be used in media gateways between the PSTN and IP network, or in hosts which are connected to both of these networks. .
• the present invention facilitates the provision of a more robust telephony service with the possibility of adding innovative new services.
• the invention also results in a saving of bandwidth and enhanced user friendliness, both of which are of considerable economical benefit.
• the IP network can be used for phone and other IP-based services while the phone service can also use the circuit switched network if there is congestion in the IP network; furthermore, in the case of power failure the circuit switched network will automatically be connected;
• the phone service is converted to IP telephony at the earliest stage in the network, thereby saving bandwidth;
• the invention facilitates the addition of new services, e.g. a common phone answering service for regular telephony and IP telephony.
• a system for switching an analogue telephone, or telephone network, between an IP connection and a CSN connection characterised in that switching means are provided to automatically connect said analogue telephone, or telephone network, to a default connection in the absence of a switching signal initiated from a telephone handset, in that detection and control means are provided to detect said switching signal and, on detection of said switching signal, to actuate said switching means to connect said analogue telephone, or telephone network, to a non-default connection.
• Said default connection may be a connection to the CSN and said non- default connection may be a connection to said IP network.
• Said switching signal may be a dialled prefix digit.
• Power failure means may be provided adapted to detect a power failure and, on detection of a power failure, to connect said analogue telephone, or telephone network, to said CSN.
• Said switching means may be software controlled.
• Said detection and control means and said power failure means may be implemented on an adapter card located in a PC.
• Said IP connection may be an ISDN connection.
• Said IP connection may be an ADSL connection.
• Said IP connection may be realised over an optical fibre.
• Said telephone network may include a plurality of subscriber equipments.
• Said system may be adapted for installation in residential premises.
• Said system may be adapted to act as a switch between a PSTN and a
• customer apparatus characterised in that said apparatus incorporates a system as set forth in any previous paragraph.
• an adapter card comprising detection and control means adapted to detect a switching signal originating from a telephone and, on detection of said switching signal, adapted to actuate switching means to connect an analogue telephone, or telephone network, to a non-default connection.
• Said switching signal may be a dialled prefix digit.
• Said default connection may be a connection to the CSN and said non- default connection is a connection to said IP network.
• Power failure means may be provided adapted to detect a power failure and, on detection of a power failure, to connect said analogue telephone, or telephone network, to said CSN.
• a CSN gateway means and a terminal adapter means may be provided.
• Said detection and control means may be implemented in software.
• PC characterised in that said PC incorporates an adapter card as set forth in any previous paragraph.
• a method of switching an analogue telephone, or telephone network, between an IP connection and a CSN connection characterised by automatically connecting said analogue telephone, or telephone network, to a default connection in the absence of a switching signal originating from a telephone, and by actuating a switch, on detection of said switching signal, to connect said analogue telephone, or telephone network, to a non-default connection.
• Said default connection may be a connection to the CSN and said non- default connection may be a connection to said IP network.
• Said switching signal may be a dialled prefix digit.
• said analogue telephone, or telephone network may be connected to said CSN.
• Said IP connection may be an ISDN connection.
• Said IP connection may be an ADSL connection.
• FIG. 1 schematically illustrates the system of the present invention.
• Figure 2 illustrates an adapter card according to the present invention.
• IP Internet Protocol
• PSTN Public Switched Telephone Network
• a system, according to the present invention, for facilitating this is illustrated in Figure 1.
• the system is essentially a residential gateway to which both the CSN, IP network and home network are connected.
• Analogue telephones form part of the home network which may, inter alia, include a PC, fax machine and other subscriber apparatus.
• the residential gateway includes an adapter card which may, for convenience, be located in a PC, i.e. in a Residential Gateway.
• the adapter card is illustrated schematically in Figure 2.
• the adapter card includes a gateway, GW, to the CSN, a terminal adapter TA and a software switch to enable either the CSN, or the IP network to be linked directly to the home telephony network.
• a power failure relay is also provided to automatically connect the home telephony network to the CSN in the event of a power failure.
• Switching between the CSN and IP network is performed automatically and is totally software controlled.
• the call which is received first is the one that is accepted.
• the preferred type of telephony i.e. the type of telephony normally used by the subscriber
• the system default is the system default.
• a prefix digit is used. For example, if CSN telephony is the default, dialling a telephone number will result in a connection being made via the PSTN. However, if a prefix digit is dialled, e.g. "9", the connection will be established via IP telephony and the adapter will perform all the necessary conversion functions required by the IP.
• the gateway can also be used as a gateway between the circuit switched network and the IP network, but only for a single call.
• the system of the present invention can be used: in a Residential Gateway between a home network and a public network; and

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Multimedia (AREA)
• Telephonic Communication Services (AREA)
• Sub-Exchange Stations And Push- Button Telephones (AREA)
• Devices For Supply Of Signal Current (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20417568

Family Applications (1)

Country Status (4)

Cited By (2)

Citations (4)

• 1999
  • 1999-11-01 SE SE9903949A patent/SE517556C2/sv not_active IP Right Cessation
• 2000
  • 2000-10-20 EP EP00973326A patent/EP1232638A1/en not_active Ceased
  • 2000-10-20 WO PCT/SE2000/002041 patent/WO2001033819A1/en not_active Application Discontinuation
• 2002
  • 2002-04-29 NO NO20022018A patent/NO20022018L/no not_active Application Discontinuation

Patent Citations (4)

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