WO1998057508A1 - Extended mobility for a dect-system - Google Patents

Extended mobility for a dect-system Download PDF

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Publication number
WO1998057508A1
WO1998057508A1 PCT/SE1998/001087 SE9801087W WO9857508A1 WO 1998057508 A1 WO1998057508 A1 WO 1998057508A1 SE 9801087 W SE9801087 W SE 9801087W WO 9857508 A1 WO9857508 A1 WO 9857508A1
Authority
WO
WIPO (PCT)
Prior art keywords
dect
terminal
mobility
internet
coverage area
Prior art date
Application number
PCT/SE1998/001087
Other languages
French (fr)
Inventor
Gunnar Almgren
Clas Nycander
Original Assignee
Telia Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telia Ab filed Critical Telia Ab
Priority to EP98928770A priority Critical patent/EP0990353A1/en
Publication of WO1998057508A1 publication Critical patent/WO1998057508A1/en
Priority to NO996063A priority patent/NO996063L/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/10—Mobility data transfer between location register and external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/16—WPBX [Wireless Private Branch Exchange]

Definitions

  • the present invention relates to system at a wireless tele- or data communications system including DECT- 5 terminals for coverage area restricted mobility within their specific DECT-coverage areas.
  • DECT telephones today are used for coverage area restricted mobility, typically within an office or within a
  • the aim of the present invention consequently is to effect above mentioned mobility function for simple and cheap mobility between different DECT-co erage areas.
  • the technology is especially useful in connection with broadband upgrading of the access network because it allows "realization” of a "second telephony subscription" over the 0 broadband IP-equipped channel, based on a comparatively simple and cheap solution.
  • This second subscription also allows a coverage area restricted mobility (For instance the home/the school/the youth centre/%)
  • Figure 1 shows the physical architecture of the system according to the present invention
  • Figure 2 shows the protocol architecture between a DECT-terminal (PP) and a base station (FP) .
  • the DECT-standard actually only defines radio access and belonging signalling.
  • the underlying network for handling of mobility and switching is actually not defined but a number of goal networks, i.a. ISDN, POTS and GSM are indicated.
  • the DECT-standard defines generic mechanisms which the underlying network must have in terms of "Home Database” (HDB) and "Visitor Location Database” (VDB) .
  • the basic idea of this invention instead is to use Internet as goal network and base mobility handling on Mobile-IP, and the voice switching on "Voice-Over- Internef-technology .
  • the DECT-terminal correspond to, in the IP-world, a "proxy" which to Internet just looks like an Internet-telephony-equipped computer.
  • the interface II is the ordinary DECT-interface .
  • the interface 12 is an IP-based interface which is identical to the interface which a computer equipped with Internet-based telephony makes use of in order to via a gateway (GW) communicate with terminals in PSTN and/or the ISDN-notwoi k . 13 constitutes a normal POTS-interface .
  • the interface 14 is used by GW for incoming calls from PSTN to convert the "telephone number" of the DECT-terminal to corresponding IP-address.
  • the interface is also used by FP in connection with the "location update"-procedure to translate from IPUI to IP-address (because the DECT-mobile does not know “its" IP-address).
  • Each mobile DECT-terminal consequently must be allocated a unique IP-address.
  • the database has been arranged in order to make calls from PSTN/ISDN as transparent as possible. If the solution is used in the application "2:nd subscription” and "ordinary" DECT- telephone number is 7075560, the DECT-teiminals of the home can be allocated number #7075560n, where n is a digit between 1 and 9 which acccordingly makes possible up to 9 mobile terminals.
  • Mobile IP is a standard intended to provide Internet- connected computers with a function which makes possible that these can move between different connection-points to Internet without extensive reconfiguration of terminal and/or network elements.
  • a Home Agent At the computer's home network (for instance a LAN) there is a "Home Agent” which picks up IE'-packets intended for the mobile computer if this is not on the home network. "Home Agent” forwards these packets to the network where the mobile computer is at present.
  • Voice over IP is a generic term for a number of technologies which make possible voice communication over Internet. Such a technology includes in addition to coding/decoding and transport protocol also simple functions for signalling and handling of connections.
  • H.323 is a standard (actually for video conference) which a number of suppliers have announced that they intend to support. H.323 allows negotiation about which voice coding algorithm that shall be used for a session.
  • Such gateways make voice communication possible between an Internet-connected computer and PSTN-conrected computer. Protocol architecture and procedure
  • the "fixed part" of the DECT-system implements a "gateway function" between DECT-based telephony and Internet-based telephony and serves as a "proxy” for a DECT-portable in "Internet”.
  • the protocol architecture is shown in Figure 2.
  • H.323 suggests as default the use of "DECT” as voice- encoding technology which, if POTS-Internet gateway supports DECT-encoding, eliminates the need of "recoding” in Fixed Part (FP) .
  • the "location update" function of the DECT-system is mapped on corresponding functions in Mobile IP.
  • Home Agent corresponds in principle to "HLR” of the DECT-standard, and "Foreign Agent” corresponds to VLR.
  • Kalle connected to ISDN/PSTN makes a call to Sven's DECT-telephone, Kalle "dials" Sven's ordinary DECT-number. If Sven is within his own ordinary DECT-coverage area, everything will proceed just as usual. If, on the other hand, Sven is in another DECT-coverage area than what he normally has coverage area for, then the call is forwarded from the ordinary DECT-coverage area via Internet (described above) to the other DECT-coverage area where Sven is. After that Sven can answer in usual way.
  • FP keeps count of where Sven is, i.e. if Sven is in ordinary DECT-coverage area, or in another acknowledged DECT-coverage area. It also should be realized that when Sven moves between two DECT-coverage areas, Sven can not be accessed via his telephone. FP in ordinary DECT-coverage area has no knowledge of where Sven is, but just observes that Sven is out of the coverage area.
  • an acknowledged DECT-coverage area is referred to a coverage area which can handle the DECT-i nformation via Internet and which can identify a DECT-terminal belonging to another DECT-coverage area, for instarce Sven's DECT- terminal .

Abstract

The invention relates to a system at a wireless telecommunications system and data communications system which makes possible terminal mobility by means of utilizing DECT-technology and Internet. DECT-terminals are used today for coverage area restricted mobility. The technology is advantageous from an economic point of view, but the mobility is comparatively restricted. A simple and cheap mobility between DECT-coverage areas is lacking, so such a functionality can be regarded as desirable. The invention consequently is aimed at making an extended mobility for the DECT-system possible by utilizing an Internet protocol. The invention is based on 'Mobile IP', which is a standard which is intended to provide Internet-connected computers with a function which makes possible that these can move between different points of connection to Internet without an extensive reconfiguration of terminal and/or network elements.

Description

TITLE OF THE INVENTION: Extended mobility for a DECT-system
Field of the invention
The present invention relates to system at a wireless tele- or data communications system including DECT- 5 terminals for coverage area restricted mobility within their specific DECT-coverage areas.
Prior art
DECT telephones today are used for coverage area restricted mobility, typically within an office or within a
ID home. The technology is cheap, but the mobility is limited. Simple and cheap mobility between these "DECT islands" (office, home etc), however, is to a great extent lacking. A mobility function which implies that a customer can make and receive calls on the same mobile terminal at home, as
15 well as when visiting the homes of acquiantances, and at the working place (but not while travelling between these places) will have a power of attraction if service and equipment is made sufficiently cheap. However, there are needed cheap base stations and an underlying network o adapted to this type of "not-continuous" limited mobility.
The aim of the present invention consequently is to effect above mentioned mobility function for simple and cheap mobility between different DECT-co erage areas.
Summary of the invention 5 This aim is achieved by a system according to the patent claim 1.
The technology is especially useful in connection with broadband upgrading of the access network because it allows "realization" of a "second telephony subscription" over the 0 broadband IP-equipped channel, based on a comparatively simple and cheap solution. This second subscription also allows a coverage area restricted mobility (For instance the home/the school/the youth centre/...)
Further characteristics of the present invention are given in the subclaims.
Brief description of the drawings
In the following a detailed description of an embodiment of the invention is given with reference to the enclosed drawings.
Figure 1 shows the physical architecture of the system according to the present invention;
Figure 2 shows the protocol architecture between a DECT-terminal (PP) and a base station (FP) .
Detailed description of an embodiment of the invention
The DECT-standard actually only defines radio access and belonging signalling. The underlying network for handling of mobility and switching is actually not defined but a number of goal networks, i.a. ISDN, POTS and GSM are indicated. The DECT-standard defines generic mechanisms which the underlying network must have in terms of "Home Database" (HDB) and "Visitor Location Database" (VDB) .
These rather well correspond to the HLR/VLR-concept in GSM.
The basic idea of this invention instead is to use Internet as goal network and base mobility handling on Mobile-IP, and the voice switching on "Voice-Over- Internef-technology . The DECT-terminal correspond to, in the IP-world, a "proxy" which to Internet just looks like an Internet-telephony-equipped computer.
In the following, the invention will be described with reference to Figure 1. The interface II is the ordinary DECT-interface . The interface 12 is an IP-based interface which is identical to the interface which a computer equipped with Internet-based telephony makes use of in order to via a gateway (GW) communicate with terminals in PSTN and/or the ISDN-notwoi k . 13 constitutes a normal POTS-interface . The interface 14 is used by GW for incoming calls from PSTN to convert the "telephone number" of the DECT-terminal to corresponding IP-address. The interface is also used by FP in connection with the "location update"-procedure to translate from IPUI to IP-address (because the DECT-mobile does not know "its" IP-address). Each mobile DECT-terminal consequently must be allocated a unique IP-address. The database has been arranged in order to make calls from PSTN/ISDN as transparent as possible. If the solution is used in the application "2:nd subscription" and "ordinary" DECT- telephone number is 7075560, the DECT-teiminals of the home can be allocated number #7075560n, where n is a digit between 1 and 9 which acccordingly makes possible up to 9 mobile terminals. "#" results in that the call is connected to a POTS-H.323 gateway from which the DECT-terminal can be reached. From the DECT-terminal numbers are "dialled" just as ususal. The number database can be indexed with both telephone number and IPUI (International Portable User Identification) .
The mobility function in the DECT-system to great extent utilizes existing technology which will now be subject of an overall discussion.
Mobile IP
Mobile IP is a standard intended to provide Internet- connected computers with a function which makes possible that these can move between different connection-points to Internet without extensive reconfiguration of terminal and/or network elements. Home Agent
At the computer's home network (for instance a LAN) there is a "Home Agent" which picks up IE'-packets intended for the mobile computer if this is not on the home network. "Home Agent" forwards these packets to the network where the mobile computer is at present.
Foreign Agent
When a computer is connected to a "foreign" network, it will register itself by the there existing "Foreign Agent". "Home Agent" is informed about that the computer's "care-off"-address now is the IP-address for "Foreign Agent".
When Home Agent has picked up a packet intended for the mobile terminal (the computer) this packet is encapsulated in another packet addressed to "Foreign Agent". Foreign Agent unpacks the original packet and forwards this to the mobile terminal (the computer) .
Voice over IP
"Voice over IP" is a generic term for a number of technologies which make possible voice communication over Internet. Such a technology includes in addition to coding/decoding and transport protocol also simple functions for signalling and handling of connections. H.323 is a standard (actually for video conference) which a number of suppliers have announced that they intend to support. H.323 allows negotiation about which voice coding algorithm that shall be used for a session.
Internet Voice Gateways
Recently products have been launched which bridge Voice-over-IP-technology with ordinary PCTS-technology .
Such gateways make voice communication possible between an Internet-connected computer and PSTN-conrected computer. Protocol architecture and procedure
The "fixed part" of the DECT-system implements a "gateway function" between DECT-based telephony and Internet-based telephony and serves as a "proxy" for a DECT-portable in "Internet". The protocol architecture is shown in Figure 2.
The DECT-portable ' s signalling for establishing of connection is "mapped" on corresponding functions in H.323. H.323 suggests as default the use of "DECT" as voice- encoding technology which, if POTS-Internet gateway supports DECT-encoding, eliminates the need of "recoding" in Fixed Part (FP) .
The "location update" function of the DECT-system is mapped on corresponding functions in Mobile IP. Home Agent corresponds in principle to "HLR" of the DECT-standard, and "Foreign Agent" corresponds to VLR.
In the following a concrete example is given of how the system according to the invention will function, without going into technical details. If, for instance, Kalle connected to ISDN/PSTN makes a call to Sven's DECT-telephone, Kalle "dials" Sven's ordinary DECT-number. If Sven is within his own ordinary DECT-coverage area, everything will proceed just as usual. If, on the other hand, Sven is in another DECT-coverage area than what he normally has coverage area for, then the call is forwarded from the ordinary DECT-coverage area via Internet (described above) to the other DECT-coverage area where Sven is. After that Sven can answer in usual way.
It consequently should be realized that FP keeps count of where Sven is, i.e. if Sven is in ordinary DECT-coverage area, or in another acknowledged DECT-coverage area. It also should be realized that when Sven moves between two DECT-coverage areas, Sven can not be accessed via his telephone. FP in ordinary DECT-coverage area has no knowledge of where Sven is, but just observes that Sven is out of the coverage area.
When Sven moves into the coverage area in another acknowledged DECT-coverage area, this is registered in FP in said other DECT-coverage area, at which an identification signal is transmitted via GW (Internet) to FP in ordinary DECT-coverage area. In that way FP in ordinary DECT-coverage area will know in which other acknowledged DECT-coverage area Sven is. It consequently should be realized that, in addition to his ordinary DECT-coverage area, Sven has coverage area in just any number of other acknowledged DECT-coverage areas .
By an acknowledged DECT-coverage area is referred to a coverage area which can handle the DECT-i nformation via Internet and which can identify a DECT-terminal belonging to another DECT-coverage area, for instarce Sven's DECT- terminal .
The above mentioned is only to be regarded as a preferred embodiment of the invention, and the extent of protection of the invention is only defined by what is indicated in the following patent claims.

Claims

PATENT CLAIMS
1. System at a wireless tele- or data communications network including DECT-terminals for coverage area restricted mobility within their specific DECT-coverage areas, c h a r a c t e r i z e d in that an Internet protocol is arranged to effect a mobility function for handling of DECT-information between said DECT-coverage areas .
2. System according to patent claim 1, c h a r a c t e r ! z e d in that said mobility handling is based on a Mobile Internetprotocol (Mobile-IP) and "voice switching" based on "Voice-Over-Internet"-technology .
3. System according to patent claim 2, c h a r a c t e r i z e d in that a DECT-terminal in
Mobile-IP corresponds to a "proxy" which towards Internet is experienced as an Internet-telephony equipped computer.
4. System according to patent claim 3, c h a r a c t e r i z e d in that when a DECT-terminal is connected to a foreign network, it will register itself by means of the there existing "Foreign Agent" corresponding to "VLR" of the DECT-standard, at which the "Home Agent" of said DECT-terminal, corresponding to "HLR" of the DECT- standard, is informed about that the "care of address" of the DECT-terminal now is the IP-address for "Foreign Agent".
5. System according to patent claim 4, c h a r a c t e r i z e d in that when "home Agent" in ordinary DECT-coverage area receives a telephony packet intended for said mobile terminal which is in another DECT- coverage area, said telephony packet is encapsulated in another packet addressed to "Foreign Agent" in said other DECT-coverage area, at which "Foreign Agent" unpacks original telephony packet and forwards it to said mobile terminal .
6. System according to any of the patent claims 2-5, c h a r a c t e r i z e d in that it includes a DECT- interface (II) for communication between just any DECT- terminal and a DECT base station (FP), an IP-based interface (12) for communication between said DECT base station (FP) and a gateway (GW) , which gateway communicates with terminals in PSTN/ISDN via a POTS-interface (13) .
7. System according to any of the patent claims 2-6, c h a r a c t e r i z e d in that it includes an interface (14) between said gateway (GW) and a number database (DB), and an interface (14) between said number database (DB) and said DECT base station (FP) for conversion of DECT-numbers to corresponding IP-addresses and vice versa.
PCT/SE1998/001087 1997-06-13 1998-06-08 Extended mobility for a dect-system WO1998057508A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98928770A EP0990353A1 (en) 1997-06-13 1998-06-08 Extended mobility for a dect-system
NO996063A NO996063L (en) 1997-06-13 1999-12-09 Wireless telecommunication and data communication system with DECT terminals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9702266A SE9702266L (en) 1997-06-13 1997-06-13 DECT terminal
SE9702266-9 1997-06-13

Publications (1)

Publication Number Publication Date
WO1998057508A1 true WO1998057508A1 (en) 1998-12-17

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EP (1) EP0990353A1 (en)
NO (1) NO996063L (en)
SE (1) SE9702266L (en)
WO (1) WO1998057508A1 (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000033537A1 (en) * 1998-12-03 2000-06-08 Telefonaktiebolaget Lm Ericsson (Publ) System and method for providing multiple endpoints in a device disposed in a packet-switched network
WO2000039965A1 (en) * 1998-12-30 2000-07-06 Ericsson Inc. System and method for providing terminal mobility in h.323 systems
WO2000040053A1 (en) * 1998-12-23 2000-07-06 Ericsson Inc. Configurable communication system having ip-based capabilities
WO2000042761A1 (en) * 1999-01-12 2000-07-20 Telefonaktiebolaget Lm Ericsson (Publ) Communications network and method for directly routing calls to mobile subscribers using an internet protocol network
WO2000042791A1 (en) * 1999-01-13 2000-07-20 Pentikaeinen Jaakko Wirelesss network and methods to be used therein
WO2000079744A1 (en) * 1999-06-23 2000-12-28 Telefonaktiebolaget L M Ericsson (Publ) Improvements in internet telephony
EP1107549A2 (en) * 1999-11-19 2001-06-13 Pace Micro Technology Ltd Broadcast data receiver apparatus and system supporting VoIP calls
EP1133204A1 (en) * 2000-03-08 2001-09-12 Sagem Sa Computer network with several gateways including one to the telephone network
FR2807597A1 (en) * 2000-04-11 2001-10-12 Sagem Digital cordless communication network mobility having handset entering second base area detected/requesting registration with location sent and server requesting position confirmation/base state re initialisation request.
EP1150521A1 (en) * 2000-04-25 2001-10-31 Alcatel Method for setting up a session between a host of a data network and a mobile terminal of a mobile network and device for performing such method
WO2002019666A2 (en) * 2000-09-01 2002-03-07 Nextlink.To A/S A communications terminal, a system and a method for internet/network telephony
WO2002076072A1 (en) * 2001-03-20 2002-09-26 Marconi Uk Intellectual Property Ltd Voip systems
EP1892940A1 (en) * 2006-08-23 2008-02-27 Thomson Telecom Belgium Device and method for enabling SIP DECT terminal mobility
EP1874019A3 (en) * 1999-02-24 2008-07-02 Telefonaktiebolaget LM Ericsson (publ) Methods and systems for call routing and codec negotiation in hybrid voice/data/internet/wireless systems
DE102007010582A1 (en) * 2007-03-05 2008-09-11 Siemens Home And Office Communication Devices Gmbh & Co. Kg Method and base station for setting up an account in a network with VoIP protocol for DECT handsets
GB2481302A (en) * 2010-06-14 2011-12-21 Avaya Inc Downloading suitable software to a DECT base station to enable use with a newly registered wireless DECT handset having a unique identifier.
US9171275B2 (en) 2009-09-30 2015-10-27 Avaya Inc. Method for determining communicative value

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
1995 FOURTH IEEE INTERNATIONAL CONFERENCE ON UNIVERSAL PERSONAL..., November 1995, (Tokyo, Japan), MASSIMO MASCOLI et al., "Alternative Scenarios for Data Applications Via Internet-Mobile and DECT-ATM Interworking", pages 788-791. *
NEW ORLEANS SUPERCOMM/ICC'94, Volume 2, May 1994, (New Orleans, Louisiana, USA), "Mobile Computing in a LAN Environment". *
WIRELESS NETWORKS - CATCHING THE MOBILE FUTURE - 5TH IEEE ..., Volume 3, Sept. 1994, "The Walkstation Project on Mobile Computing". *

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000033537A1 (en) * 1998-12-03 2000-06-08 Telefonaktiebolaget Lm Ericsson (Publ) System and method for providing multiple endpoints in a device disposed in a packet-switched network
WO2000040053A1 (en) * 1998-12-23 2000-07-06 Ericsson Inc. Configurable communication system having ip-based capabilities
WO2000039965A1 (en) * 1998-12-30 2000-07-06 Ericsson Inc. System and method for providing terminal mobility in h.323 systems
US6693894B1 (en) 1999-01-12 2004-02-17 Telefonaktiebolaget Lm Ericsson (Pulb) Communications network and method for directly routing calls to mobile subscribers using an internet protocol network
WO2000042761A1 (en) * 1999-01-12 2000-07-20 Telefonaktiebolaget Lm Ericsson (Publ) Communications network and method for directly routing calls to mobile subscribers using an internet protocol network
AU772994B2 (en) * 1999-01-12 2004-05-13 Telefonaktiebolaget Lm Ericsson (Publ) Communications network and method for directly routing calls to mobile subscribers using an internet protocol network
WO2000042791A1 (en) * 1999-01-13 2000-07-20 Pentikaeinen Jaakko Wirelesss network and methods to be used therein
EP1874019A3 (en) * 1999-02-24 2008-07-02 Telefonaktiebolaget LM Ericsson (publ) Methods and systems for call routing and codec negotiation in hybrid voice/data/internet/wireless systems
WO2000079744A1 (en) * 1999-06-23 2000-12-28 Telefonaktiebolaget L M Ericsson (Publ) Improvements in internet telephony
EP1107549A2 (en) * 1999-11-19 2001-06-13 Pace Micro Technology Ltd Broadcast data receiver apparatus and system supporting VoIP calls
EP1107549A3 (en) * 1999-11-19 2001-10-04 Pace Micro Technology Ltd Broadcast data receiver apparatus and system supporting VoIP calls
FR2806237A1 (en) * 2000-03-08 2001-09-14 Sagem COMPUTER NETWORK COMPRISING A PLURALITY OF GATEWAYS TO AT LEAST ONE TELEPHONE NETWORK
EP1133204A1 (en) * 2000-03-08 2001-09-12 Sagem Sa Computer network with several gateways including one to the telephone network
FR2807597A1 (en) * 2000-04-11 2001-10-12 Sagem Digital cordless communication network mobility having handset entering second base area detected/requesting registration with location sent and server requesting position confirmation/base state re initialisation request.
EP1150521A1 (en) * 2000-04-25 2001-10-31 Alcatel Method for setting up a session between a host of a data network and a mobile terminal of a mobile network and device for performing such method
US7408915B2 (en) 2000-09-01 2008-08-05 Nextlink Patent Ab Communications terminal, a system and a method for internet/network telephony
US8611328B2 (en) 2000-09-01 2013-12-17 Castani Co. L.L.C. Communications terminal, a system and a method for internet/network telephony
US7187670B2 (en) 2000-09-01 2007-03-06 Nextlink.To A/S Communications terminal, a system and a method for internet/network telephony
WO2002019666A3 (en) * 2000-09-01 2002-05-02 Nextlink To As A communications terminal, a system and a method for internet/network telephony
WO2002019666A2 (en) * 2000-09-01 2002-03-07 Nextlink.To A/S A communications terminal, a system and a method for internet/network telephony
US10911576B2 (en) 2000-09-01 2021-02-02 Callahan Cellular L.L.C. Communications terminal, a system and a method for internet/network telephony
US10237375B2 (en) 2000-09-01 2019-03-19 Callahan Cellular L.L.C. Communications terminal, a system and a method for internet/network telephony
US9553955B2 (en) 2000-09-01 2017-01-24 Callahan Cellular L.L.C. Communications terminal, a system and a method for internet/network telephony
US8107449B2 (en) 2000-09-01 2012-01-31 Castani Co. L.L.C. Communications terminal, a system and a method for internet/network telephony
US9001816B2 (en) 2000-09-01 2015-04-07 Castani Co. L.L.C. Communications terminal, a system and a method for internet/network telephony
WO2002076072A1 (en) * 2001-03-20 2002-09-26 Marconi Uk Intellectual Property Ltd Voip systems
EP1892940A1 (en) * 2006-08-23 2008-02-27 Thomson Telecom Belgium Device and method for enabling SIP DECT terminal mobility
WO2008022837A1 (en) * 2006-08-23 2008-02-28 Thomson Licensing Device and method for enabling sip dect terminal mobility
DE102007010582A1 (en) * 2007-03-05 2008-09-11 Siemens Home And Office Communication Devices Gmbh & Co. Kg Method and base station for setting up an account in a network with VoIP protocol for DECT handsets
WO2008107414A3 (en) * 2007-03-05 2009-06-04 Gigaset Communications Gmbh Method and base station for creating an account in a network featuring a voip protocol for dect mobile parts
WO2008107414A2 (en) * 2007-03-05 2008-09-12 Gigaset Communications Gmbh Method and base station for creating an account in a network featuring a voip protocol for dect mobile parts
US9171275B2 (en) 2009-09-30 2015-10-27 Avaya Inc. Method for determining communicative value
GB2481302B (en) * 2010-06-14 2014-03-12 Avaya Inc Method for registering communication terminals with base station devices by using virtual appliances
US8233903B2 (en) 2010-06-14 2012-07-31 Avaya Inc. Method for registering communication terminals with base station devices by using virtual appliances
GB2481302A (en) * 2010-06-14 2011-12-21 Avaya Inc Downloading suitable software to a DECT base station to enable use with a newly registered wireless DECT handset having a unique identifier.

Also Published As

Publication number Publication date
SE9702266L (en) 1998-12-14
SE9702266D0 (en) 1997-06-13
NO996063L (en) 2000-02-10
NO996063D0 (en) 1999-12-09
EP0990353A1 (en) 2000-04-05

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