• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method and system control for the setup of an IP telephony connection between an original terminal and a destination terminal in an IP network over a gateway of a branch exchange. To increase the availability of the overall system for each IP terminal and to enhance in this way the voice quality of the IP-telephony connection, the setup of a connection between the original terminal and a first gateway is effected, according to the invention, by means of a list of IP addresses, a connection between the first gateway and a second gateway is set up by a system control of the branch exchange, and a connection between the second gateway and the destination terminal is effected by the second gateway, the setup of the connection between the first gateway and the second gateway through the system control comprising the determination of a gateway with spare traffic-handling capacities among the several gateways of the branch exchange and the definition of this gateway as being the second gateway.
    公开号:CA2525732A1
    申请号:C2525732
    申请日:2005-11-04
    公开日:2006-05-05
    发明作者:Udo Kayser；Frank Rodewald
    申请人:Avaya Tenovis GmbH and Co KG；
    IPC主号:H04L12-66
    专利说明:
    Patenta~w~lte Tergau $. Pohl Sehe Description Mexhod and system control for the setup of an IP telephony conn~cti~on The ini entian relates to a method and system control for the setup of an IP te-lephor~y connection between terminals in an IP network, controlled by a branch exchar ge which is also connected to the IP network. A branch exchange com-prises~ at least one gateway, and several terminals are allocated to one gateway.In the Internet telephony over IP networks (voice over IP networks), branch ex-i changles and other technical devices (terminals) are connected with each other through special gateways over the Internet or an Intranet, so that it is possible to make calls over the IP network from a conventional telephone to another conven-tional telephone using the normal telephone number and possibly a special Inter-net aqcess code. For the user of the conventional telephone, the utilization of the IP netiwork is hidden.According to the state of the art, in the Internet telephony (voice over II', VoIP}, an iP terr~ninal functioning according to an Internet protocol (1P) (1P terminal) is allo-cated, I~ke every conventional ISDM terminal, in addition to its IP address, a di-rector~r number assigned within the branch exchange to which this terminal is allo-catedl through a directory-number plan, to a fixed hardware address (HWA). The Internlet-telephony interface (VoIP board, applicant's product name, here synony-mous~to gateway) behaves, as seen by the (software for the) exchange, like an asserttbly with non IP terminals, i.e. the terminal is fixedly allocated to an HWA.This ins realized by converting the HWA transmitted, upon setup of the connection, to thei gateway ('slolP board) into an IP address with which the gateway (VoIPboard) sets up the connection over th~ IP network (LAN) to the IP terminal. In the opposite direction (i.e. as seen by the terminal setting up the conneetlon), the ter-minal,sets up, over the iP address of the gateway stored in the terminal, the con-('a'renfar~w~lte TergAU 8 Pohl 5eite 2 ~i nectiol't to this gateway and thus to the branch exchange. That means that there is an unambiguous allocation between terminal and gateway.I As they connection is in general switched over two different gateways (VoIPboard), the data flow (media stream) must as a rule be switched over a switching matrix' of the branch exchange. In the switching matrix or switching network of the branch exchange, incoming and outgoing lines or channels are connected with each Qther in conformity with control data.When: connecting terminals over two different gateways (VoIP boards), there are two fir~nscoding operations, namely, on the one hand, the transcoding from IPcoding to ISDN coding and, on the other hand, the transcoding from ISDN coding to IP boding. Only if the calling and the called terminals are allocated to the same VoiP board, will it be possible to switch the data flow (media stream) on the as-semb~y, i.e. without the switching matrix of the branch exchange, and the trans~dings are omitted.Furthermore, the number of IP terminals (1P phones) allocated to one gateway (VoIP board) is often clearly larger than the capacity of a gateway ('~JoIP board) for the control of connections.i It is the object of the invention to create a method and a system control with which the at~ove-mentioned shortcomings of the prior art can be avoiided and the avai-labiht~V of the overall system for each IP terminal and thus the uoice guality of the IP-tel~phony connection can be enhanced.i This abject is achieved according to the invention through the method according to cJaim~1 and the system control according to claim 7, respectively. Preferred em-bodirrnents of the invention are the subject matter of the dependent claims petenta~~Cte Tergeu & Pohl Seite 3 The idea of the invention is based on a flexible, i.e. connection-related, allocation of IP tt;rminals to gateways (VoIP boardsj, in order to avoid the switching of the data flew over the switching matrix of the branch exchange. Far this purpose, all gateways (VoIP boards of one branch exchange are combined in a pool. In addi-tion, ail IP terminals allocated to this branch exchange are allocated, through the directory-number plan, to one pseudo hardware address. This pseudo hardware address has the same format as a conventional hardware address, however, ac-cordin~g to the invention, there exists no longer a physical port in the branch ex-changie, which is allocated to this hardware address. If upon setup of a connec-tion, slush a pseudo hardware address is determined, the connection will be set up over any other gateway of the branch exchange. Preferably, the gateway (VoIPboard over which the calling terminal (if the latter is also an IP terminal) sets up the coinnection will be used. If this is not possible because that gateway does not have any spare traffic-handling capacities, the connection will be set up over an-other gateway, preferably the one with the lowest capacity utilisation.The rrnethod according to the invention for setting up an IP telephony connection between an original terminal and a destination terminal among several terminals in an IP network through one of several gateways of a branch exchange comprises the following steps: setting up a connection between the original terminal and a first gateway, the original terminal selecting the first gateway from several gate-ways by means of a list of IP addresses, setting up a connection between the origin$I terminal and a first gateway, the original terminal selecting the first gate-way from the several gateways by means of a fist of (P addresses, verification whether the first gateway has any spare traffic-handling capacities and, if the first gateway has spare traffic-handling capacities, setting up a connection between the first gateway and the destination terminal. Preferably, if the first gateway is found. not to have any spare traffic-handling capacities, a second gateway of the brandh exchange with spare traffic-handling is selected, a connection between the first gateway and the Second gateway through a system control of the branch ex-Patentar~w~lte Tergau 8. Pohl Seite 4 change is set up, and a connection between the second gateway and the destina-tion te~inal is set up.In ether words: the gateways used for establishing the contact between the termi-pals are selected in view of availability or capacity aspects, If p~ssifJle in view of these bspects, the first gateway, to which contact from the original terminal is made fusing the list of IP addresses, is also used for establishing contact to the i destination terminal, thus establishing a communication channel requiring one gateway only. If due to capacity aspects this is eat possible, an appropriate se-cond gateway is selected for establishing the communication channel to the desti-nation terminal. IPreferlably, the method possesses one or several of the following features indi-vidual;y or in combination:deterrttination and definition of the second gateway comprises: veriification i whethjer the first gateway has any spare traffic-handling capacities and definition of the vfirst gateway as being at the same time the second gateway, if the first gatewlay has spare traffic-handling capacities, so that the connection between the first gi~teway and the second gateway is a gateway-internal connection, and search for a gateway with spare traffic-handling capacities, and definition of the gatewlay as being the second gateway, if the f first gateway does not hare any spare traffic-handling capacities;detenj~ination of the IP address of the original terminal and the destination termi-nal arid respective conversion into a pseudo hardware address as a function of the gateway, and connection of an input and an output in a switching matrix in the systerin control in accordance with the pseudo hardware address of the original termirjal and the destination terminal, respectively;i the IP~ address is converted into a pseudo hardware address through a data-flow control unit in the system control, and spare traffic-handling capacities of the (first and) second gateways are determined through a call control; Patenta ~wa~te Tergau & Pohl Seite 5 Ithe pseudo hardware address has the same format as a conventional hardware address (the pseudo hardware address can be distinguished from conventional hardwgre addresses e.g. by using value areas reserved for it);the psleudo hardware address is transmitted to the call control as being the i sender's address and through it, configuration data of the original terminal are registered by the call control-IThe system control according to the invention in a branch exchange for setting up an IP-telephony connection between an original terminal and a destination termi-nal anhong several terminals in an IP network, over one of several gateways of a branc~t exchange comprises: a data-flow control unit for converting the IP address of an priginal terminal or a destination terminal, respectively, into a pseudo hard-ware address, and a call control for determining a gateway of the branch ex-change having spare traffic-handling capacities, and for connecting an input with an output in a switching matrix as a function of the pseudo hardware address of the original terminal and the destination terminal and of the gateway, far the dura-Ition of the connection.In particular, the data-flow control comprises an MSC address table with an allo-cation between IP address and pseudo hardware address, the pseudo hardware addrelss having the same format as a conventional hardware address.The application of the invention offers, among others, the following advantages, As, according to the invention, the gateway (VoIP board) is allocated to the IPterminal (IP phone) for the duration of one connection only, each gateway (VoIPboard) can now be used for each IP terminal (1P phone) so that the availability of each ~P terminal (1P phone) in the total system is increased. The method according to the invention is not limited to branch exchanges with severpl gateways ('VoIP boards), That means that It is not necessary to have two different implementations of a branch exchange, one of them enabling the opera-I Patenta~w~lte Tergau 8~ Pohl Seita 6 tion of'a branch exchange with several gateways (VoIP boards) and the other, the operation of a branch exchange with a single gateway ('VoIP board). IIIn addlition to the adwantage that no transcoding operations are necessary (this applied to the use of different Codecs or the capacity utilisation of a VoiP board and toi the improvement of the voice quality (QoS; (duality of Service)), the avail-ability iof the overall system for each IP terminal (1P phone) is increased. The switching software can remain almost unchanged, only slight modifications have to be harried out on the VoIP boards for implementing the invention. Further advantages and features of the invention will become evident from the following description of preferred embodiments, with reference to the enclosed drawings. Fig. 1 shows a branch exchange on an IP network with several terminals accor-ding to the state of the art for a first communication path. Fig. 2 shows a branch exchange on an IP network with several terminals accor-ding to the state of the art for a second communication path.Fig. 3 shows a branch exchange according to the invention on an IP network with several terminals for a third communication path.Fig. 4 shows a branch exchange according to the invention on an IP network with several terminals for a fourth communication path.Figure 1 shows the structure of an IP network with several terminals 1 on an LAN~ with which they are connected through connection lines 3. In the figures, con-nectio~ns are in general represented in dotted lines, whereas active connections are represented in continuous lines, and their reference number has always the suppl~ment "a".i Patenta~w~lte Tergau & Pohl Seite 7 IIl The temninals 1 are connected to a branch exchange 4 comprising several gate-ways ~VoIP assemblies or VoIP boards) 5. Each gateway 5 is adapted for a group of terrftinals. The gateway & V1, for example, is adapted for the terminals 1 com-bined ~n a first group 8, the gateway 5 V2 is adapted for the terminals 1 combined in a second group 7, and the gateway 5 V3 is adapted for the terminals 1 com-bined ~n a third group 8.l As to the IP terminals 1 of the first group 6, the IP address of the gateway 5 V1 is stored in the individual (P terminals 1 of the first group 6. Equally, concerning the IP terrp~inals 1 of the second group 7, the IP address of the gateway 5 V2 is stored in the iindividual IP terminals 1 of the second group 7 and, concerning the IP ter-minal~ 1 of the third group B, the IP address of the gateway 5 V3 is stored in the individual IP terminals 1 of the third group 6. Each of the gateways 5 possesses a fixed number of switchable channels 9 or 10, channel 9 being the one in which the gatewby 5 is the gateway of the original terminal 1 a (gateway upstream from the terminal) and channel 1 g being the one in which gateway 5 is the gateway of the destinlation terminal (terminal upstream from the gateway). Each of these chan-nels hlas a fixed hardware address, as seen by the branch exchange.Fig. 1 shows a first communication process in which the original terminal 1 a dials the directory number of a destination terminal 1 b, which belongs to another group of terminals, in the example shown, to group $. First, over the IP address stored in the original terminal 1 a, the connection 3a, 9a to the gateway 5a V1 is set up, and from there, over a channel 12, to a call-control software containing a switching matrix 11. The call control determines the hardware address associated with the dialled directory number of the destination terminal 1 b. This hardware address leads Ito the gateway 5b and through the connection 10a, 3a, to the terminal 1 b.As the connection is switched over two different gateways, the data flow (media strearjn) must be switched over the switching matrix 11 of the branch exchange 4, i.e., thieve are two transcoding operations, namely from IP coding to ISDfV coding and vice versa, from ISDN coding to IP coding. In the switching matrix '! 1, incom-Patenta~pw~lte Ter9au ~ Pohi Seite 8 i i ing ankl outgoing lines or channels are Connected with each other in conformity with c~ntroi data.Fig. 2 (shows the layout according to Fig, 1 for the case that the two terminals 1a and 1!~ communicating with each other are connected to the same gateway 5a.Identical companents as in Fig. 1 are marked with the same reference numbers as in Fig. 1. When the two involved terminals 1a and 1b belong to the same group din this case, 7) and are, therefore, supplied by the same gateway 5a, it is not neces-sary tQ transmit the data from the gateway 5 to the call-control software and to store the call parameters. In this case, the entire voiceldata traffic can be regu-lated inn the gateway 5a, which is the only one involved in the communication con-nection, so that only an internal routing onward from port 9a to port 7 Oa over an internal loop 14 is necessary. Therefore, in this case, no transcoding is necessary at all, Ilt has to be noted, however, that such a constellation will only occur in a fractidn of all possible cases, if the branch exchange Q possesses more than one gatewiay 5. In the state of the art shown in Fig. 1 and in Fig. 2, there are practically rigid tunnels between one gateway 5 and the IP terminals 1 allocated to it. As soon ~s two IP terminals 1 involved in a connection are allocated to different gatev~ays 5, the data flow has to be directed over the switching matrix 11 of the branch exchange, so that two transcoding operations become necessary.i Afthou~gh the relation between the number of IP terminals ((P phones) 1 allocated to ene gateway 5 and the connection capacity of the gateway ~ is the result of traffic~theoretical computations, the IP terminals 1 according to this state of the art are often unable, in case of load, to set up connections or cannot be reached by others, whereas at the same time other gateways 5 of the same branch exchange 4 mig~ t not be fully utilised-The f~Ilowing is a description of the method according to the invention with refe-rence;to Figures 3 and 4. PBfentar~wdlte Tergau 8. Pohl 5eite 9 Accorqling to the invention, a list of the IP addresses of the gateways 5 of the brancYi exchange 4 is stored in each IP terminal 1. A subdivision of the terminals 1 into grpups 6, 7, 8 as well as the rigid allocation of one gateway 5 to each of these group$ is, therefore, no longer necessary with the invention, because every termi-nal 1 Gin access every gateway 5 through the litter's IP address. The setup of a connection will in the following be described with reference to the example shown in Fig. 3, in which the original terminal 1 a sets up the connection over the gateway 5a. Thie original terminal 9 a dials the directory number of the destination terminal 1b. Firist, the gateway 5a is selected by means of the IP address list stored in the original terminal 1 a, the connection to the gateway 5a is set up and, from there, over a bidirectional connection 20, routed onward to a system control 17. The systenh control 17 consists of the call-control software 19 and a data-flow control 18, which according to the invention represents a new functional unit (media-streanp control, MSC).The IR address of the original terminal 1a is transmitted to the data-flow control MSC 18 and is translated there, over an MSC address table, into the pseudo hardware address allocated to the original terminal 1a. This pseudo hardware ad-dress has the same format as a conventional hardware address, but there exists no physical port in the branch exchange associated with this hardware address.'The folllowing Table 1 is an example for an MSC address table.1P (Pseudo) hardware Address address 123.4~a6.789.11 HWA1 123.456.789.12 HWA2 123. H WA3 56.789.13 123.~5C.789.14 HWA4 123.4;56.789.15 _ HWAS_.__._ _.~ 123_56_789_ HWA6 123.4 56.789.17H WA7 Patenta~wfift~ Tergau 8 Pohl Seite 10 i 123.456.789_ HWA8 123.458.789. HWA9 Table ~1 The left-hand column contains the IP addresses, and in the right-hand column, the assocjated pseudo hardware addresses are listed.The p$eudo hardware address of the original terminal 1a is transmitted in a setup mESSage (first connection-setup message) as the sender's address to the call contro',I 19. Over th~ pseudo hardware address, the call control 19 can read the configluration data of the original terminal 1 a, like in the case of a conventional hardvuare address, From the directory-number plan, in which each directory number of an IP terminal 1 is allocated a pseudo hardware address, the hardware address associated with the dulled directory number of the destination terminal 1 b is determined. If this address is, like in this example, a pseudo hardware address, the going setup is not transmitted to an assembly, but to the data-flow control MSC 18. The following Table 2 is an example for a directory-number plan.. Directory number (Pseudo) hardware address 4711 first terminal of groupHWA1 6) 471 Z second terminal ofHWA2 group 6) 4713 third terminal of groupHWA3 6) 5030 ~~first terminal ofHWA4 group 7) 5191 second terminal of groupHWAS7) 5274 Cthird terminal of groupHWA6 7) 6123 Qfirst terminal of groupHWA7 8) 5456 second terminal of groupI-IWA8 8) Patenfariwaite Ye~gau 8~ Pohl Seite ~ ~ Ii 5789 ( hind terminal of group 8) I HWA9 Table ~2 IThe left-hand column of Table 2 contains the directory numbers of the first, se-cond, third terminals 1 of group 6, of the first, second, third terminals 1 of group 7, and of!the first, secflnd, third terminals 1 of group B, in the right-hand column, the associated pseudo hardware addresses are indicated.The data-flow control MSC 18 can determine, with the help of Table 1 and a gateway allocation table (Table 4) described below, by means of the sender's pseudo hardware address of the original terminal 1a, the allocated gateway 5a, and can determine, with the help of a gateway load table (Table 3) described be-low, whether the gateway 5a still has some free (switchable) channels, The following Table 3 is an example for the gateway load table in the data-flow control MSC 18. Gate~ivayAvailable channelsFree channels v~ - - 3024 V3j 30 10 Table 3 For etch gateway 5, the number of free channels and - preferably - the number of availa$~le channels is listed.The following Table 4 is an example for a gateway allocation table in the data-flow control MSC 18, i Patentarjw~ite Tergau & Pohl Seite 12 IP ddress Gateway 123.A~56.789.11V1 123. V1 56.789.12 123. V1 56.789.13 123. fi6.789.14V2 123. 56.789.15V2 123.456_7$3_16V2 123.456.789.17 V3 123.456_789_18 V3 123. V3 56.789.19 Table ~t For eaich IP address, a gateway 5 is listed, whereby, of course, the allocation need riot necessarily be reversibly unambiguous. By means of the above tables, the data-flow control MSC 18 cars determine whether the gateway 5a has free (switchable) channels. If so, the setup message will be~passed on to the gateway 5a, if not, it will be determined by means of the same fable which gateway 5 has the lowest load, i.e. the largest number of free channels. The setup message will then be sent to that gateway. In the example in Table ~ and in Fig. 3, the gateway 5a has a total of 30 available channels, 20 of which are still free. In order to avoid, as explained above, a double transcoding, the connection between the branch exchange 4 and the destination terminal 1 b is, therefore, handled over this gateway 5a, as it has enough spare capacities. Only after the gateway 5a is completely utilised, will an alternative gateway be sear-ched. ~fhe setup message sent to the gateway 5a contains the Il' address of the destination terminal 1 b, which is determined by fihe MSC by means of the pseudo hardware address of destination ~1 b) (see Table 1 )_ The gateway 5b sets up the connection to the terminal 1b with this IP address. Patentarjw~lte Tergau & Pohl Seite ~ 3 In another example, shown in Fig. 4, the capacity of the gateway 5a selected by the original terminal 1 a is fully utilized- Therefore, it rejects the inpuiry of the sys-tem control 17 for setup of a connection. The system control 17 starts further at-tempt~ to other gateways 5. In the example shown in Fig. 4, the gateway 5b has the lowest load, i.e. the largest number of free channels. Accordingly, the setup message is sent to this gateway.if the rapacity of all gateways 5 is fully utilized, the connection setup will be inter-ruptec~. Otherwise, the connection will be setup over the first available gateway found ~ in the above-described way.Thus, ~to increase the availability of the overall system for each IP terminal and to enhance in this way the voice quality of the IP-telephony connection, the setup of a connection between the original terminal and a first gateway is effected, ac-cording to the invention, by means of a list of IP addresses, a connection between the first gateway and a second gateway is set up by a system control of the branc(1 exchange, and a connection between the second gateway and the desti~nation terminal is effected by the second gateway, the setup of the connection behrvelen the first gateway and the second gateway by the system control com-prisin~ the determination of a gateway with spare traffic-handling capacities among the several gateways of the branch exchange and the definition of this gatevNay as being the second gateway. Patentarjw~lte Tergau & Pohl 5eite 1 Reference Numerals i 1 SIP terminal 2 ~IP network (LAN) 3 !Connection of IP terminal with I.AN4Branch exchange Gateway in branch exchange, 5a and 5b active gateways 6 (First group of IP terminals 7 iSecond group of IP terminals 8 Third group of IP terminals 9 :Hardware connection IP terminal - gateway, 9a active hardware connection !Hardware connection gateway - IP terminal, 10a active hardware connec-tion 11 Switching matrix 12 Link "input" of gateway with switching matrix 13 !Link "output" of gateway with switching matrix 1a !Internal loop in gateway without transcoding !Pseudo hardware connection original terminal - gateway, 15a active pseudo 'hardware connection 16 !Pseudo hardware connection gateway - original terminal, 15a active pseudo (hardware connection 17 (System control 18 pats-flow control 19 Call control IBidirectional connection gateway - data-flow control
    权利要求:
    Claims (8)
    [1] 1 Claims 1. Method for the setup of an IP telephony connection between an original termi-nal (1a) and a destination terminal (1b) among several terminals (1) in an IPnetwork (2) over one of several gateways (5) of a branch exchange (4) with the steps:- setting up a connection between the original terminal (1a) and a first gateway (5a), the original terminal (1a) selecting the first gateway (5a) from the several gateways (5) by means of a list of IP addresses, - verification whether the first gateway (5a) has any spare traffic-handling ca-pacifies and, if the first gateway (5a) has spare traffic-handling capacities, - setting up a connection between the first gateway (5a) and the destination terminal (1b).
    [2] 2. Method according to claim 1, with the further steps:- if the first gateway (5a) is found not to have any spare traffic-handling ca-pacities, searching for a second gateway (5b) of the branch exchange (4) with spare traffic-handling - setting up a connection between the first gateway (5a) and the second gate-way (5b) through a system control (17) of the branch exchange (4), and - setting up a connection between the second gateway (5b) and the destina-tion terminal (1b).
    [3] 3. Method according to claim 1 or 2, with the steps:- determination of the IP address of the original terminal (1a) and the destina-tion terminal (1b) and respective conversion into a pseudo hardware address as a function of the gateway (5) and - connection of an input and an output in a switching matrix (11) in the system control (17) in accordance with the pseudo hardware address of the original terminal or the destination terminal.
    [4] 4. Method according to claim 3, in which - the IP address is converted into a pseudo hardware address through a data-flow control unit (18) in the system control (17) and - spare traffic-handling capacities of the first and second gateways (5a; 5b) are determined by a call control (19).
    [5] 5. Method according to claim 3 or 4, in which the pseudo hardware address has the same format as a conventional hard-ware address.
    [6] 6. Method according to any of claims 3 to 5, in which the pseudo hardware address is transmitted to the call control (19) as the sender's address and, over it, configuration data of the original terminal are registered by the call control (19).
    [7] 7. System control in a branch exchange for setting up an IP telephony connec-tion between an original terminal (1a) and a destination terminal (1b) among several terminals (1) in an IP network (2) over one of several gateways (5) of a branch exchange (4), which comprises:- a data-flow control unit (18) for converting the IP address of an original ter-minal (1a) or a destination terminal (1b), respectively, into a pseudo hardware address, and - a call control (19) for determining a gateway (5) of the branch exchange with spare traffic-handling capacities and for connecting an input (12) with an out-put (13) in a switching matrix (11) as a function of the pseudo hardware ad-dress of the original terminal and the destination terminal and of the gateway (5a; 5b) for the duration of the connection.
    [8] 8. System control according to claim 7, in which the data-flow control (18) comprises an MSG address table with an allocation between IP address and pseudo hardware address, the pseudo hardware ad-dress having the same format as a conventional hardware address.
    类似技术:
    公开号 | 公开日 | 专利标题
    US7424025B2|2008-09-09|Methods and systems for per-session dynamic management of media gateway resources
    JP3940122B2|2007-07-04|Method for forming usable features for alternate connections of primary connections
    US6654455B1|2003-11-25|IP conference telephone system compatible with IP-PBX systems
    US7330463B1|2008-02-12|Enterprise voice over internet protocol | virtual private network |
    US7706802B2|2010-04-27|Media gateway interconnect routing in a softswitch environment
    US7133514B1|2006-11-07|Premise-based voice bridge extension
    US20070041357A1|2007-02-22|Interworking of hybrid protocol multimedia networks
    US20060140198A1|2006-06-29|Method and system for determining media gateway loading
    CN1949781A|2007-04-18|System and method for establishing emergency communications in a telecommunication network
    US20090059906A1|2009-03-05|Routing of telecommunications
    US7701927B2|2010-04-20|Method for transmitting communication data in a communication system
    CN1406031A|2003-03-26|Multi-attaching agency device and relative method
    EP1655937B1|2013-10-16|Method and system control for setting up an IP telephony connection
    US20080117807A1|2008-05-22|Accelerated Recovery During Negotiation Between a Media Gateway and a Media Gateway Controller
    US8817775B2|2014-08-26|Access gateway and method of operation by the same
    CN101127740B|2011-07-13|A method for supporting inter-office mixing connection
    CA2525732C|2014-06-17|Method and system control for the setup of an ip telephony connection
    CN101707548B|2012-04-04|Soft switch network and method for establishing call in soft switch network
    WO2006111842A1|2006-10-26|Loas sharing in a media gateway
    CN108769441A|2018-11-06|Soft switch call method and system
    KR100666940B1|2007-01-11|Call distribution system and method in voice over internet protocal
    US20020067735A1|2002-06-06|Telecommunication system for control of multiple switches in a common address space
    CN109151236A|2019-01-04|Calling route selection method and call route selecting system
    KR20060020945A|2006-03-07|Network system and method for processing voip call
    KR20030093743A|2003-12-11|Router with a built-in VoIP gateway
    同族专利:
    公开号 | 公开日
    CA2525732C|2014-06-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2006-07-27| EEER| Examination request|
    2016-12-17| MKLA| Lapsed|Effective date: 20161104 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102004053926||2004-11-05||
    DE102004053926.6-42||2004-11-05||
    [返回顶部]