WO1999059356A1 - Method and apparatus for setting up calls in a telecommunications system - Google Patents
Method and apparatus for setting up calls in a telecommunications system Download PDFInfo
- Publication number
- WO1999059356A1 WO1999059356A1 PCT/EP1999/003127 EP9903127W WO9959356A1 WO 1999059356 A1 WO1999059356 A1 WO 1999059356A1 EP 9903127 W EP9903127 W EP 9903127W WO 9959356 A1 WO9959356 A1 WO 9959356A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- switching centre
- call
- address
- intermediate node
- switching
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000011664 signaling Effects 0.000 claims abstract description 47
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 14
- 210000004271 bone marrow stromal cell Anatomy 0.000 description 8
- 230000001413 cellular effect Effects 0.000 description 3
- 101100482117 Saimiri sciureus THBD gene Proteins 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13034—A/D conversion, code compression/expansion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/1307—Call setup
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13098—Mobile subscriber
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13166—Fault prevention
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13176—Common channel signaling, CCS7
Definitions
- the present invention relates to a method in a telecommunications network for use in management and/or control of a call between two transceivers.
- the invention relates further to an arrangement and an apparatus for use in a telecommunications network for performing call management and/or control operations.
- a cellular radio telecommunication system or a Public Land Mobile Network comprises a Mobile Services Switching Centre (MSC) for controlling and/or managing communications of a Mobile Station (MS) connected to the network system.
- the Mobile Station (MS) communicates with the MSC through a Base Station Subsystem (BSS) , to which the MS is connected over a radio (i.e. air) interface between a Base Station (BS) of the Base Station Subsystem (BSS) and the MS.
- the MSC includes databases so as to enable an operation of the system.
- the databases are such as a Home Location Register (HLR) and a Visitor Location register (VLR) and additional databases for further subscriber information and billing operations etc.
- HLR Home Location Register
- VLR Visitor Location register
- MSCs can be divided e.g. to Visited MSCs (VMSC) and Transit MSCs (TMSC) or Gateway MSCs (GMSC) . From these the VMSC is a MSC which used by a subscriber who is having a connection to a base station connected to this particular MSC.
- the TMSCs or the GMSCs are, in turn, used as nodes for possible routing and switching operations in the communications path between, i.e. intermediate, two VMSCs, or between a VMSC and any other exchange or switching point, or even between two TMSCs. Therefore, when a call is established between two mobile stations, the call is also accomplished between an originating VMSC and a terminating VMSC, and there may be one 2
- the speech and other messaging is coded in the transmitting Mobile Station or similar transmitting and receiving terminal (transceiver) , such as voice mail box, before the transmission thereof by using an appropriate coding technique.
- a VSELP Vector Sum Excited Linear Prediction
- PSI-CELP Switch Synchronized Innovation - Excited Linear Prediction
- 5.6 kbits/s speech coding is used on the half rate channel over an air or radio interface to the Base Station.
- a transcoder or codec is connected to the originating Mobile Services Switching Centre (VMSC) controlling the radio interface between the BSS and the calling mobile station.
- the transcoder is used to convert the VSELP/PSI-CELP coded speech to a PCM (Pulse Code Modulation) ⁇ -law coded speech so as to enable communication towards the PSTN.
- PCM Packe Code Modulation
- the VSELP/PSI-CELP coded speech is transmitted transparently over the PLMN network.
- the transcoders are through connected during the connection so as to avoid a conversion of e.g. a VSELP/PSI-CELP coded speech to a PCM ⁇ -law coded speech and then back to VSELP/PSI-CELP coded speech, which would decrease the speech quality at the receiving end.
- the transcoders are active, i.e. converting the VSELP/PSI-CELP coded speech to the PCM ⁇ -law coded speech during the call setup in order to enable listening of announcements and tones from the telephone network.
- the transcoders are changed or switched to the through connected mode by means of a specific codec control signalling by using a Mobile Application Part (MAP) over a system 7 signalling (#SS7) .
- MAP Mobile Application Part
- #SS7 system 7 signalling
- PLMN arrangements such as the PDC, in which the codec control signalling occurs as end-to-end signalling, i.e. the air interface is coded from one end to the other.
- the messages are addressed with a Network Code (NC) and a Signalling Point Code (SPC) of the designated Visited Mobile Services Switching Centre (VMSC) .
- the addresses are carried in an ISUP (Integrated Services Digital Network User Part) signal as an IAM (Initial Address Message) .
- IAM Intelligent Address Message
- the codec control signalling is performed for basic calls only according to a DMNI (Digital Mobile Communications Network Internode Interface) standard. For example, at forwarded calls the codec control is not performed, but the PCM ⁇ -law speech coding is always used between the originating VMSC and the terminating VMSC. This, however, causes a remarkable decrease in speech quality.
- DMNI Digital Mobile Communications Network Internode Interface
- the intermediate nodes or connection points like transit exchanges or MSCs or Service Switching Points (SSP) providing Intelligent Network (IN) services, are not able to know the speech coding used in the communications. This is a disadvantage e.g. in cases where monitoring equipment or similar, or an announcement should be connected to the call.
- the system is not aware of the coding by which announces, messages, information, tones etc. should be transmitted to the mobile station (s) or which coding should be used to decode received announces, tones, control messages etc.
- it is not possible to affect and control the used coding during the connection e.g. it is not possible to change the mode of the coding e.g. from VSELP to ⁇ -law coding during the call), which might be required e.g. in cases where a conference call 4
- An object of the present invention is to provide a solution by means of which the management and monitoring of calls is made easier to accomplish in the intermediate nodes of a Land Mobile Network.
- An object of the present invention is to provide a solution by means of which unnecessary coding/decoding in a call between two transceivers communicating through a cellular system is avoided.
- An object of the present invention is to provide a solution by means of which a delay and/or additional signalling in switching additional features and/or services to a call implemented by means of end-to-end signalling is avoided.
- An object of the present invention is to provide a solution in which speech quality of a call between two mobile stations is improved.
- An object of the present invention is to provide a solution by means of which switching operations, such as switching a call to Intelligent Network service applications or switching of monitoring apparatus or announcements to a call, can be eased.
- the objects are obtained by a method of implementing a call in a telecommunications system, the call being routed from a first transceiver to a second transceiver via a first switching centre and a second subsequent switching centre, the method comprising: including in a call setup message from the first switching centre to the second switching centre an address of said first switching centre; intercepting the call setup message at a telecommunications node intermediate to the first and second switching centres; replacing the address of the first switching centre in the setup message from the first switching centre with an address of the intermediate node; forwarding the call set up message transmission to the second switching centre; and sending a response message including call set up information and using end to end signalling from said second switching centre, said response message using said substitute address of the intermediate node and being terminated in the intermediate node.
- An embodiment of the invention provides an arrangement in a telecommunications system, said arrangement comprising: a first transceiver, a second transceiver, a first switching centre through which the first transceiver may communicate and which has a first address, a second switching centre through which the second transceiver may communicate and which has a second address, a communication path between the first switching centre and the subsequent second switching centre, an intermediate node in the communication path between said first switching centre and said second switching centre, a call from the first transceiver to the second transceiver being routed through said intermediate node, wherein the arrangement is such that the intermediate node is arranged to intercept the address the first switching 6
- an intermediate switching centre for use in a communication path between a first switching centre and a subsequent second switching centre of telecommunications system, wherein a call from a first transceiver to a second transceiver is routed through said intermediate switching centre, and wherein the intermediate switching centre is arranged to intercept and replace an address of the first switching centre contained in a setup message of the call with a new address, whereby response messages implemented by means of end to end signalling from the second switching centre are addressed to a destination designated by said new address.
- the solution provides a simple and reliable manner for call management and control.
- the solution enables monitoring of calls using end to end signalling (e.g. calls from a mobile station to another mobile station or transceiver in a PDC system) in intermediate nodes, such as transit MSCs.
- the solution enables further a change of a transcoder mode by the intermediate nodes for supporting services provided by an intelligent network (IN) .
- I intelligent network
- delays in the signalling and amount of undesired signalling can be decreased, and the quality of calls from a mobile station to another mobile station call can be improved .
- Figures 1 and 2 are schematic presentations of prior art calls from a mobile station to a PSTN and a PLMN networks, respectively;
- Figure 3 is a schematic signalling chart of the prior art signalling during a call setup between two mobile stations
- Figure 4 is a flow chart for one embodiment in accordance with the present invention.
- FIG. 5 is a schematic signalling chart in accordance with the present invention.
- Figure 6 discloses a network arrangement including an IN.
- FIG. 1 is a schematical presentation of a prior art speech call from a PLMN mobile station MS 1 to a fixed network, such as to a Public Switched Telephone Network (PSTN) 5 or an Integrated Digital Services Network (ISDN), through a base station 2, an originating Mobile 'Services Switching Centre
- PSTN Public Switched Telephone Network
- ISDN Integrated Digital Services Network
- the originating Mobile Services Switching Centre (MSC) 3 controls the communications between the base station 2 and the calling mobile station 1.
- a transcoder 6 is connected to or implemented in the originating MSC 3.
- the transcoder 6 is used to convert the VSELP/PSI-CELP coded speech to a PCM (Pulse Code Modulation) ⁇ -law coded speech as disclosed by figure 1 so as to enable communication towards the PSTN.
- Figure 2 discloses a situation in which a connection is established between a mobile station 1 and a further mobile station connected to a Public Land Mobile Network (PLMN) 10. In this a VSELP/PSI-CELP coded speech is transmitted transparently over the PLMN network 10.
- PLMN Public Land Mobile Network
- the transcoder 6 is through connected during the connection so as to avoid any conversions of e.g. a VSELP/PSI-CELP coded speech to a PCM ⁇ - law coded speech as was disclosed by figure 1 and then back to VSELP/PSI-CELP coded speech, which would decrease the speech quality at the receiving mobile station end.
- the transcoder 6 is in an active state, i.e. converting the VSELP/PSI-CELP coded speech to the PCM ⁇ -law coded speech, so as to enable the listening of announcements and tones from the telephone network. Only after the setup is completed, the transcoder 6 is switched to the through connected mode by means of a specific codec control signalling by using a Mobile Application Part (MAP) over a system 7 signalling (#SS7) .
- MAP Mobile Application Part
- #SS7 system 7 signalling
- Figure 3 discloses an example of the call setup signalling of a call between a first and a second mobile stations 1 and 11, respectively, through an originating or first MSC 3, a gateway or transit MSC 4 and a terminating or second MSC 8.
- the messages sent as response from the terminating MSC 8 and using end to end signalling include information concerning set-up requirements for the transcoder (CODEC SET REQ) , which messaging is then acknowledged by the originating MSC 3.
- the transcoder of the prior art arrangement is to the through connected mode at this stage (i.e. to the end to end signalling mode) .
- the addresses for the codec control are transferred in the ISUP (ISDN User Part) messages, e.g. as an IAM (Initial
- the messages may be addressed by a Network Code (NC) and signalling point code (SPC) of the destination node (i.e. 9
- the IAM and ACM are both carrying also a call reference, which is generated by the sending node (by the originating MSC for the IAM and by the terminating MSC for the ACM) and which identifies the particular call within the sending node which initially generated it.
- the call references are included in the codec control messages and thus they are used to identify the call in the node or nodes.
- the intermediate node (such as intermediate connection points or switching points or transit exchanges or transit MSCs or gateways) is arranged to terminate the end to end signalling by replacing the address of the respective MSC in the call routing information with it's own address and by generating a new call reference in the ISUP signalling (for both the IAM and the ACM) .
- the terminating MSC believes to transmit the set-up requirements and other signalling directly to the originating MSC at step 106, it indeed addresses the messages to the intermediate node.
- the terminating MSC becomes "forced" to send the codec set-up requirements to the intermediate node (e.g. a switching point or transit MSC) instead of the originating MSC when responding to the call setup signalling.
- intermediate node can, for instance, accomplish the following operations: 1) relay the message to 10
- the originating MSC by using the address and call reference received from the ISUP signalling and stored in the intermediate node, or 2) reject the change of the transcoder mode, whereby the communication is continued by using e.g. ⁇ - law speech coding in conventional manner.
- Figure 5 discloses a signalling chart for the above described operation.
- the call is initiated by sending an IAM (Initial Address Message) from the originating MSC 3 to the terminating MSC 8 through an intermediate or transit MSC 4.
- IAM Initial Address Message
- the address and the call reference are intercepted and changed in the transit MSC 4, whereafter a modified IAM will be transmitted to the terminating MSC 8.
- the terminating MSC 8 responses by sending an ACM (Address Complete Message) , whereafter the call reference of the ACM is replaced by the intermediate transit exchange or MSC 4.
- a CPG Call Progressing
- the intermediate MSC 4 receives the CPG message and routes it further to the originating MSC 3.
- the signalling is switched to the end to end mode.
- the terminating MSC 8 transmits subsequently a CODEC SET REQ message, which is, however, not routed directly to the originating MSC 3 due to the modified address and call reference, but is terminated in the intermediate MSC 4.
- the intermediate MSC 4 sends back an acknowledgment that the requirements are received (CODEC SET ACK) . Thereafter the call will be connected between the mobile stations 1 and 11.
- Figure 6 discloses one possible network arrangement including an originating MSC 3, a transit MSC 4 and a terminating MSC 8 operable in a manner already explained above. > r-o ⁇ — ' o o
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000549051A JP2002515709A (en) | 1998-05-12 | 1999-05-06 | Method and apparatus for setting a call in a telecommunications system |
GB0026228A GB2352366B (en) | 1998-05-12 | 1999-05-06 | Method and apparatus for setting up calls in a telecommunications system |
AU40385/99A AU755725B2 (en) | 1998-05-12 | 1999-05-06 | Method and apparatus for setting up calls in a telecommunications system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI981050A FI106905B (en) | 1998-05-12 | 1998-05-12 | Method and device in a telecommunication system |
FI981050 | 1998-05-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999059356A1 true WO1999059356A1 (en) | 1999-11-18 |
Family
ID=8551704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/003127 WO1999059356A1 (en) | 1998-05-12 | 1999-05-06 | Method and apparatus for setting up calls in a telecommunications system |
Country Status (6)
Country | Link |
---|---|
US (1) | US6522655B1 (en) |
JP (1) | JP2002515709A (en) |
AU (1) | AU755725B2 (en) |
FI (1) | FI106905B (en) |
GB (1) | GB2352366B (en) |
WO (1) | WO1999059356A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000051313A2 (en) * | 1999-02-24 | 2000-08-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Call set-up in a telecommunications system |
EP1130894A2 (en) * | 2000-02-29 | 2001-09-05 | Lucent Technologies Inc. | Conferencing and announcement generation for wireless VoIP and VoATM calls |
WO2003103313A1 (en) * | 2002-05-31 | 2003-12-11 | Siemens Aktiengesellschaft | Interrogation of the current valid bit rate for the interruption of a trfo call |
WO2005107198A1 (en) | 2004-04-21 | 2005-11-10 | Alcatel Wireless, Inc. | Media gateway interconnection routing in a distributed mobile switching center environment |
CN1328927C (en) * | 2000-01-03 | 2007-07-25 | 艾利森电话股份有限公司 | Method for handling transcoding of connections handed off between mobile switching centers |
AU2002356273B2 (en) * | 2001-11-30 | 2008-01-17 | Intellprop Limited | Telecommunications services apparatus for processing telephone communications |
Families Citing this family (19)
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WO2001008434A1 (en) * | 1999-07-22 | 2001-02-01 | Telefonaktiebolaget Lm Ericsson | A system and method of communicating operating capabilities in a telecommunication network |
AUPQ274199A0 (en) * | 1999-09-09 | 1999-09-30 | Ericsson Australia Pty Ltd | Information transmission rate control across a core network |
JP3881157B2 (en) * | 2000-05-23 | 2007-02-14 | 株式会社エヌ・ティ・ティ・ドコモ | Voice processing method and voice processing apparatus |
JP2002009940A (en) * | 2000-06-21 | 2002-01-11 | Fujitsu Ltd | Method and device for controlling communication in intelligent network |
US7043247B2 (en) * | 2002-07-01 | 2006-05-09 | Interdigital Technology Corporation | Routing header based routing in internet protocol (IP)-cellular networks |
US6879833B2 (en) * | 2002-07-11 | 2005-04-12 | Sprint Spectrum L.P. | Method and system for vocoder bypass using differentiated telephone numbers |
US6963635B1 (en) * | 2003-05-06 | 2005-11-08 | Sprint Spectrum L.P. | Method and system for facilitating collection of subscriber past due balance |
US8126017B1 (en) * | 2004-05-21 | 2012-02-28 | At&T Intellectual Property Ii, L.P. | Method for address translation in telecommunication features |
US8108691B2 (en) * | 2005-02-07 | 2012-01-31 | Sandisk Technologies Inc. | Methods used in a secure memory card with life cycle phases |
US8423788B2 (en) * | 2005-02-07 | 2013-04-16 | Sandisk Technologies Inc. | Secure memory card with life cycle phases |
US8321686B2 (en) * | 2005-02-07 | 2012-11-27 | Sandisk Technologies Inc. | Secure memory card with life cycle phases |
US7743409B2 (en) * | 2005-07-08 | 2010-06-22 | Sandisk Corporation | Methods used in a mass storage device with automated credentials loading |
US8966284B2 (en) * | 2005-09-14 | 2015-02-24 | Sandisk Technologies Inc. | Hardware driver integrity check of memory card controller firmware |
US7934049B2 (en) * | 2005-09-14 | 2011-04-26 | Sandisk Corporation | Methods used in a secure yet flexible system architecture for secure devices with flash mass storage memory |
EP1781054B1 (en) * | 2005-10-28 | 2010-03-17 | Telefonaktiebolaget LM Ericsson (publ) | Methods and apparatus for push to talk type service |
US20080052524A1 (en) * | 2006-08-24 | 2008-02-28 | Yoram Cedar | Reader for one time password generating device |
US20080072058A1 (en) * | 2006-08-24 | 2008-03-20 | Yoram Cedar | Methods in a reader for one time password generating device |
US8423794B2 (en) * | 2006-12-28 | 2013-04-16 | Sandisk Technologies Inc. | Method and apparatus for upgrading a memory card that has security mechanisms for preventing copying of secure content and applications |
US9913199B1 (en) * | 2017-06-27 | 2018-03-06 | Ge Aviation Systems Llc | Providing communication over a plurality of networks |
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WO1997002713A1 (en) * | 1995-07-05 | 1997-01-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Call forwarding in a mobile communication system |
US5608779A (en) * | 1994-11-08 | 1997-03-04 | Motorola, Inc. | Method for communications between mobile units using single and multiple switching center configurations |
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US5987327A (en) * | 1996-09-16 | 1999-11-16 | Motorola, Inc. | Method for establishing communications in wireless communication systems having multiple switching centers |
US6134316A (en) * | 1996-10-18 | 2000-10-17 | Telefonaktiebolaget Lm Ericsson | Telecommunications network with relocateability of subscriber number |
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-
1998
- 1998-05-12 FI FI981050A patent/FI106905B/en not_active IP Right Cessation
-
1999
- 1999-05-06 JP JP2000549051A patent/JP2002515709A/en active Pending
- 1999-05-06 GB GB0026228A patent/GB2352366B/en not_active Expired - Fee Related
- 1999-05-06 WO PCT/EP1999/003127 patent/WO1999059356A1/en active IP Right Grant
- 1999-05-06 AU AU40385/99A patent/AU755725B2/en not_active Ceased
- 1999-05-11 US US09/309,296 patent/US6522655B1/en not_active Expired - Lifetime
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US5608779A (en) * | 1994-11-08 | 1997-03-04 | Motorola, Inc. | Method for communications between mobile units using single and multiple switching center configurations |
WO1997002713A1 (en) * | 1995-07-05 | 1997-01-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Call forwarding in a mobile communication system |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000051313A2 (en) * | 1999-02-24 | 2000-08-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Call set-up in a telecommunications system |
WO2000051313A3 (en) * | 1999-02-24 | 2000-12-07 | Ericsson Telefon Ab L M | Call set-up in a telecommunications system |
CN1328927C (en) * | 2000-01-03 | 2007-07-25 | 艾利森电话股份有限公司 | Method for handling transcoding of connections handed off between mobile switching centers |
EP1130894A2 (en) * | 2000-02-29 | 2001-09-05 | Lucent Technologies Inc. | Conferencing and announcement generation for wireless VoIP and VoATM calls |
EP1130894A3 (en) * | 2000-02-29 | 2005-03-16 | Lucent Technologies Inc. | Conferencing and announcement generation for wireless VoIP and VoATM calls |
AU2002356273B2 (en) * | 2001-11-30 | 2008-01-17 | Intellprop Limited | Telecommunications services apparatus for processing telephone communications |
WO2003103313A1 (en) * | 2002-05-31 | 2003-12-11 | Siemens Aktiengesellschaft | Interrogation of the current valid bit rate for the interruption of a trfo call |
WO2005107198A1 (en) | 2004-04-21 | 2005-11-10 | Alcatel Wireless, Inc. | Media gateway interconnection routing in a distributed mobile switching center environment |
EP1738546A1 (en) * | 2004-04-21 | 2007-01-03 | Alcatel Wireless, Inc. | Media gateway interconnection routing in a distributed mobile switching center environment |
EP1738546A4 (en) * | 2004-04-21 | 2008-03-12 | Alcatel Wireless Inc | Media gateway interconnection routing in a distributed mobile switching center environment |
Also Published As
Publication number | Publication date |
---|---|
GB0026228D0 (en) | 2000-12-13 |
AU4038599A (en) | 1999-11-29 |
FI106905B (en) | 2001-04-30 |
US6522655B1 (en) | 2003-02-18 |
GB2352366A (en) | 2001-01-24 |
JP2002515709A (en) | 2002-05-28 |
AU755725B2 (en) | 2002-12-19 |
GB2352366B (en) | 2003-03-05 |
FI981050A0 (en) | 1998-05-12 |
FI981050A (en) | 1999-11-13 |
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