CN1411220A - Method and system of realizing IP speech service of private network - Google Patents
Method and system of realizing IP speech service of private network Download PDFInfo
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- CN1411220A CN1411220A CN 01135610 CN01135610A CN1411220A CN 1411220 A CN1411220 A CN 1411220A CN 01135610 CN01135610 CN 01135610 CN 01135610 A CN01135610 A CN 01135610A CN 1411220 A CN1411220 A CN 1411220A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/42314—Systems providing special services or facilities to subscribers in private branch exchanges
Abstract
This invention discloses a method and system for realizing IP phonetic service including NAT technological group network personal network by adding address agent servers, setting up TCP/UDP data connection between personal PC customer end registration stage and the address agent server and presetting up general channel including calling signaling channel and logic channel needed for making phone calls between PC customer end and Volp server at the registration stage, using source address and source terminal number (public address) of each channel after NAT conversion to replace corresponding PCC personal address, actually to preserved calling signaling channel and logic channel (phonetic channel, realizing Volp service used in NAT.
Description
Technical field
The present invention relates to data communication technology field, particularly a kind of method and system that on the network that comprises the private network that adopts the networking of network address translation (nat) technology, realize ip voice business (VoIP).
Background technology
Circuit-switched technology is adopted in traditional speech business, be that both call sides passes through the circuit that public switch telephone network (PSTN) is set up a fixed-bandwidth (64kbit/s), this makes the real-time communication service quality (QoS) of low time delay, low distortion be guaranteed, but network bandwidth utilance is low in this manner, communication cost height, and the popularization of value-added service is relatively more difficult.
VoIP (Voice over IP) is meant and carries out the business that voice transmit in the computer network that with IP is network layer protocol, is called for short the ip voice business.Packet-switch technology is adopted in the computer communication, and promptly Chuan Shu data cell all is the independent data bag that is formed by identification division and data division encapsulation, is referred to as " grouping " (packet), and each the communication node storage in the network is also transmitted grouping.Therefore, VoIP belongs to the category of packetized voice communication, is to be the network packetization of sign with IP and to be the result of the Network synthesization two big mainstream technologys fusions of target with the multimedia.The characteristics of packet switching are the network utilization height, and the communication cost is low, and IP network is easy to promote fast new business as open network.
Research in the communication of the enterprising lang sound of computer network is derived from the seventies.After entering the nineties, particularly in recent years, along with the Internet rise in the world and the development of speech coding technology, VoIP made a breakthrough and had obtained practical application.Its development roughly is divided into following three phases:
(1) after budding period: Internet occurred, people had at first attempted allowing two PCs transmit voice by IP network, and this is the initial a kind of form of VoIP.In this stage, people are very shallow to the understanding of VoIP, and market is also indeterminate.
(2) period of expansion: under the attraction of the many advantages of VoIP, a lot of telecommunications companies recognize and only realize between PC that IP phone can not satisfy user's needs far away, so sight invested numerous PSTN users, and this just causes the appearance of IP phone gateway.The IP phone gateway couples together PSTN network and IP network, provides phone to phone, and PC is to phone, and phone is to multiple VoIP form of services such as PC.This stage is the period that IP phone develops rapidly.
(3) maturity period: the IP phone application and development will come to the ripening period in future, have communication and adopt unified standard, and the speech ciphering equipment of each telecommunications producer of the whole world can intercommunication, the VoIP speech quality is near characteristics such as black phone quality.
The communication protocol that realizes the ip voice business comprises the voice communication control protocol, speech information transportation protocol, conference telephone control protocol and real time control protocol etc.Wherein, the voice communication control protocol is the call control signalling in the telecommunications network, comprises address information, user state information, Dual Tone Multifrequency signal etc., generally adopts transmission control protocol (TCP) as transport layer protocol.The speech information transportation protocol has stipulated how speech packet encapsulates, multiplexing and transmission, comprises how various speech codings groupings are assembled and identified, and requirement will transmit in real time, can only use User Datagram Protoco (UDP) (UDP) as transport layer protocol.IP phone is utilized real-time transport protocol (rtp) adapted packet speech data, and RTP can transmit information such as grouped time stamps, grouping serial number, supports QoS to monitor and the multiple data stream merging.In addition, for guaranteeing real-time, also selecting resource reservation protocol (rsvp) for use is to call out to keep Internet resources.The realization of VoIP at present all is when beginning to call out, and at first sets up the call signaling passage, and after carrying out Signalling exchange and consulting, setting up logical channel is voice channel, and the address of logical channel need be transmitted in the message of call signaling passage.
Private network is meant the internal network that uses private IP address, as enterprise network.Current most enterprise network all is to implement the Intranet of ICP/IP protocol, and the user uses the DHCP protocol dynamic to distribute private IP address, divides a plurality of network segments on private network, and user data is often crossed between local network segment each subnet in private network and transmitted.Enterprise network inside, the branch in same place or general headquarters use the 3rd layer-switching technologies (also to claim IP switching technology, high speed route technology etc., be a kind of mechanism of utilizing information in the 3rd layer protocol to strengthen second layer function of exchange) connect by Ethernet, and use conventional router to be connected between branch and general headquarters by special line (DDN or Leased line).Enterprise network generally has unique outlet to public network, during user to access public net, and must be by means of the nat feature of acting server.
NAT is address transition or address agency, is used for realizing the conversion between private network address and the global network address.Privately owned address is meant the host address of internal network (local area network (LAN) inside), and publicly-owned address is the external address (in the globally unique IP address on the internet) of local area network (LAN).Three following network address sections reservations of Internet Assigned Number Authority regulation are used as privately owned address:
10.0.0.0 ～10.255.255.255
172.16.0.0?～172.31.255.255
192.168.0.0～192.168.255.255
That is to say that these three network address Duan Buhui are being assigned with on the internet, but can use at privately owned (local area network (LAN)) internal network.Each private network is selected a suitable network address according to what of foreseeable future host number.The internal network address of different private networks can be identical.
The NAT technology is widely used on the private network as enterprise network, with restriction and the increase fail safe that overcomes address space, and the networking issue that solves a plurality of subnets.Network address translation provides the ability that a plurality of inside (private network) IP address transition is become (public network) IP address, outside by multiplexing TCP or udp port number.About the mode of address transition, can be divided into polytype again.The same public network address of the use that has number is distinguished different the connection with different port; What have obtains a public network address in address pool, obtain port numbers according to certain algorithm.
Multiple mode for NAT, can sum up total characteristics, be that private user is will use the service of public network the time, need obtain a public network address (comprising IP address and port numbers) by NAT, the corresponding relation of this conversion is recorded in the address port correspondence table of NAT router, corresponding both are respectively inner private IP address and mail to the source port number of outside IP message in the table, and the latter also is a destination slogan of receiving the IP message from the outside.Node at public network, the address of this private user is exactly the public network address after the NAT conversion, if send data to this private user, just directly sends this public network address, router is given private user by stored relation in the inquire address port correspondence table with data forwarding.
In simple terms, address transition technology (NAT) is that implicit IP address and port are replaced with external network IP address and port, and reverse conversion, and the advantage of NAT technology is:
1, the outer resource of host access net of internal network is provided;
2, for internal host provides " privacy (Privacy) " protection, improve fail safe;
3, solve IP address resource problem.
Use VoIP when professional when private user uses existing VoIP system, can run into following point: private network PC single-pass may occur and maybe can't converse when public network PC or gateway make a call; When public network PC or phone (passing through gateway) were dialed the PC that is arranged in private network, conversation can't be set up.Reason just is: when PC when the called PC of public network or gateway make a call, change by NAT, the call signaling of private network PC can correctly send to public network, but because the source address and the source port number of the media channel that comprises in the data division of call signaling belong to private network, the NAT router can only be changed the source address and the source port number in IP packet header, can't revise data division, so the callee can't be known the address of calling party media channel, so cause single-pass or obstructed phenomenon.When public network PC or phone (passing through gateway) when private network PC makes a call, callee's VoIP server lookup to called calling channel (or control channel) address be private net address, be connected so can't set up to call out with called PC.
Summary of the invention
Purpose of the present invention just is to provide a kind of method and system that realize the ip voice business on the network that comprises with the private network of NAT technology networking, makes private user can use the VoIP business.
The implementation method of the ip voice business of a kind of private network of the present invention may further comprise the steps at least:
A) the private user pc client is after the VoIP server sends login request message, initiate n TCP/UDP to address server and connect, the value of n is that private user pc client and VoIP server are finished call signaling passage that once conversation need foundation and total port number of logical channel;
B) address server sends to VoIP server and private user pc client respectively with public network address and port numbers through after the NAT conversion in the connection message that is received;
C) in the address field that the VoIP server is recorded in this pc client with the public network address and the port numbers of corresponding call signaling passage, the private user pc client with the public network address of counterlogic passage and
Port numbers is recorded in the corresponding address field.
According to the invention described above method, further may further comprise the steps:
D) pc client of private user is provided with timing mechanism, and making exceeds schedule time not receive exhales
When being message, repeating step a), step b), step c).
According to the invention described above method, in the described step b), address server directly sends to the private user pc client with the public network address and the port numbers through after the NAT conversion of counterlogic passage.
According to the invention described above method, in the described step b), address server sends to the VoIP server with public network address and the port numbers through after the NAT conversion in the connection message that is received, and by the VoIP server public network address and the port numbers of counterlogic passage is sent to this pc client in the response message of response private user pc client logging request.
A kind of system that realizes private network ip voice business of the present invention, at least comprise ip voice business (VoIP) server that connects by IP network, pc client, the gatekeeper, gateway and the switching equipment and the telephone terminal that connect by public switch telephone network, wherein pc client provides the pc user to carry out voice call, realize protocol processes and the conversion of calling out control and speech data, the VoIP server is realized the login authentication of pc client, the control that response is called out the request of access and carried out call proceeding, gateway is the equipment that connects IP network and public switch telephone network, and the gatekeeper provides the locating function of gateway address; It is characterized in that:
This system further comprises an address acting server, be connected with system by IP network, it receives the TCP/UDP that private user pc client sends and connects message after login, and the pc client that sends to VoIP server and private user respectively through the public network address after the NAT conversion and port numbers that will be wherein;
Described VoIP server is recorded in the address of corresponding call signaling passage in the address field of this pc client, the private user pc client is recorded in corresponding address field with the address of counterlogic passage, is private user pc client and VoIP server realization conversation reservation call signaling passage and logical channel.
Further, described VoIP server is made up of service server and client server.
The present invention is by increasing the address acting server in existing VoIP system, and set up data in private network pc client entry stage with the address acting server and be connected, the passage of finishing the required foundation of conversation between pc client and the VoIP server, comprise the call signaling passage, logical channel, just set up in advance in entry stage, and with each passage through the corresponding PCC private net address of the replacement of the source address source port number (public network address) after the NAT conversion, the actual effect of having played reservation call signaling passage and logical channel (being voice channel) realizes the application of VoIP business in the NAT networking mode.
Description of drawings
Fig. 1 is the NAT networking application system structural representation of VoIP business of the present invention.
Fig. 2 is one embodiment of the invention system configuration schematic diagram.
Fig. 3 is the login process of private network PCC embodiment illustrated in fig. 2.
Embodiment
For making purpose of the present invention, technical scheme and beneficial effect clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is further elaborated.
The present invention increases by an address acting server on existing VoIP system, finish the passage that once conversation need be set up between private user pc client and VoIP server, comprise call signaling passage and logical channel, just set up in advance in user's entry stage by the address acting server, and with public network address and the port numbers private net address and the port numbers that replace original PCC of each passage after changing through NAT.
NAT networking application system structural representation referring to VoIP business shown in Figure 1, wherein VoIP service server 10, pc user's pc client and telephone subscriber's gateway (GW) 11 all is connected by IP network, this system further comprises an address acting server 12, also is connected with system by IP network.The pc client 13 of private user inserts public network by NAT router one 4.
When the pc client of private network after the VoIP server sends logging request, initiate several times TCP or UDP connects to the address acting server, the number of times of connection equals the port number that private network PCC and VoIP finish the required foundation of once conversing.These connections number in order into passage 1 (channel 1), passage 2 (channel 2) ..., passage n (channel n), their source address is the address of private network PCC, source port number is respectively the default port number of required passage, with these several group addresss (comprising IP address and port numbers) be called PrivateNetAddr1, PrivateNetAddr2 ..., PrivateNetAddrn.These addresses belong to private net address.
By after the NAT conversion, these connect message arrival address acting servers, this moment source address through the address conversion, be converted to public network address, be called PubicNetAddr1, PublicNetAddr2 ..., PublicNetAddrn.The address acting server sends to pc client in VoIP server and the private network with these addresses, the VoIP server is recorded in the public network address of corresponding call signaling passage in the address field of this private network pc client, and the pc client in the private network is recorded in the public network address of counterlogic passage in the corresponding address field.
Because NAT has adopted timing mechanism for the record of the address transition in its ATT, surpass official hour and do not upgrade connection, record will be left out from table.So a regularly retransmission mechanism need be set, and PrivateNetAddr 1,2,3 does not receive message in official hour, just need resend TCP or UDP from trend address acting server (AddProxy) and connect.
Connect for TCP, when creating, have beginning (SYN) sign, do not have ACK sign (all TCP messages all have the ACK sign except this message).When interrupting, have termination (FIN) sign.Therefore connecting for TCP is to rely on these to judge interruption and establishment that TCP connects.
For the UDP message, the mode that can estimate the employing time.When certain is connected the some time when of no use, just think that this connection interrupted.When a new connection takes place, just think that this connection created.Thisly be used to estimate that the time of connection provides the user to dispose.
By above-mentioned step, private user had just been set up the required passage of conversing, and has been reserved by the timing retransmission mechanism always when the online login before call setup.Call out and utilize call signaling passage and the logical channel reserved to converse when taking place.This reserved passageway was removed automatically after the user was off line.
When the pc user of private network uses the VoIP business as caller, make a call to affiliated VoIP server, after the call setup, need set up logical channel by the call signaling passage of reserving.This moment, PCC sent to the VoIP server with the logical access address of oneself by the call signaling message address, and the logical access address that at this moment sends is through the public network address after the NAT conversion.Just can converse smoothly after setting up logical channel.
The pc user of private network is as called application VoIP when professional, pc user by public network makes a call by GW by PCC or telephone subscriber, the VoIP server is received call-signaling message, find called IP address, this address is through the public network address after the NAT conversion, the call signaling message is sent to the router of this address correspondence, query router NAT ATT, find corresponding private net address, call signaling is forwarded to pc client, the call signaling passage is set up.The call signaling message of the pc client loopback of private user should comprise logical access address, and this address is through the public network address after the NAT conversion.Just can converse smoothly after setting up logical channel.
Technical solution of the present invention can be applied to any ip voice business.Below in conjunction with Fig. 2, shown in Figure 3, (ONLY) is example with one number link you, further specifies content of the present invention and application.
ONLY (One Number Link You) business is along with Internet development, for satisfying the needs that the user wishes to exchange mutually and obtain information more and more urgently whenever and wherever possible, on the basis of having merged conventional telecommunications technology and IP technology, a kind of novelty business of exploitation.One Number Link You mainly is to provide unique individual service number--ONLY number for the user, provide multiple business by this number, no matter the user can contact designated user wherever more quickly, and the user who is got in touch with can answer the call by multiple modes such as PC, phone, voice mails.
The ONLY system is by formations such as One Number Link You server (ONLY Server), ONLY client server (User Server), pc client (PCC), interactive voice response equipment (IVR), database, Web servers, and wherein the VoIP server capability of One Number Link You system is to be finished jointly by ONLYServer and User Server.The major function of ONLY Server has: responsive node is called out the request of access; Obtain the address translation of ONLY number alternately with User Server; Obtain the route of called phone number alternately with gatekeeper; According to the destination address transfer call signaling of resolving; Finish controlled function to gateway (MG); Mutual with IVR, support transparent transmission Dual Tone Multifrequency number; Write down simple charge information and send to User Server.The major function of User Server has: call policy is selected (the IP address that the call policy that is provided with according to the user is true telephone number or PCC with virtual ONLY number translation); PCC login authentication, breathe out mandate, state-maintenance; Voice messaging (VM) announcement etc.
The same with other VoIP system, One Number Link You has also run into identical problem in the private network environmental applications.Referring to shown in Figure 2, be the NAT networking application system structural representation of the One Number Link You that adopts technical solution of the present invention.Wherein except that the original equipment of ONLY system, newly-increased one-over-one address acting server 12, by the IP network connecting system, and original client server and pc client made corresponding change, make PCC after User Server login, initiating UDP to the address acting server connects, the address acting server sends to UserServer with the public network address through the NAT conversion wherein, and in the logging request response of returning PCC, will send PCC to through the public network address that NAT changes by User Server, User Server and PCC write down these public network addresses through NAT conversion respectively, for private network PCC and ONLY Server set up call out reserve need passage.
The login process of private network PCC is referring to shown in Figure 3, wherein, in the private network ONLY number be 16655551234 PCC 13 after User Server 102 initiates login request message (Login_Req), need initiate three UDP to address acting server 12 and connect.These three UDP are connected to number in order be UDP1, UDP2, UDP3, their source address is the address of private network PCC 13, and UDP1,2,3 source port number are respectively the default ports number of MGCP, RTP, RTCP.This three group address (comprising IP address and port numbers) is called PrivateNetAddr1, PrivateNetAddr2, PrivateNetAddr3.This three group address belongs to private net address.
After the NAT conversion, above-mentioned three UDP message arrival address acting servers 12, this moment, source address was changed through address, had become public network address, was referred to as PublicNetAddr1, PublicNetAddr2, PublicNetAddr3.Address acting server 12 sends to User Server 102 with these three groups of public network addresses, User Server 102 is recorded in PublicNetAddr1 the address field of PCC16655551234, and in logging request response message (Login Ack), PublicNetAddr2 and PublicNetAddr3 being sent to PCC, PCC writes down this two addresses.
Because NAT has adopted timing mechanism for the address transition record that UDP is connected in the ATT, surpasses official hour and does not upgrade connection, record will be left out from table.So when conversation does not take place, PCC also must keep UDP1,2,3 be connected with address acting server 12, so a special timing retransmission mechanism need be set, PrivateNetAddr1,2,3 does not receive message in official hour, just repeats to send the UDP message from trend address acting server 12.
Through above-mentioned login process, just set up the passage that calling need be set up between private network PCC and the ONLY Server in advance by address acting server 12.
When the PCC 16655551234 of private network as caller, when making a call, set up the call signaling passage, owing in the ATT of router, maintain the private network and the public network address corresponding relation of call signaling passage, so the actual passage that is to use above-mentioned reservation of this call signaling.PCC 13 sends the MGCP data to ONLY Server 101 from source address PrivateNetAddr1, ONLY Server 101 is to User Server 102 query call control strategies, to GK inquire about called gateway or under User Server obtains called ONLY number the address of ONLY Server, begin to set up logical channel.This moment, PCC 16655551234 sent to the callee with oneself RTP and RTCP address, according to the agreement regulation, should be PrivateNetAddr2, PrivateNetAddr3.If but send private net address, can cause the other side's speech data can't correctly send to PCC 16655551234, so PrivateNetAddr2, PrivateNetAddr3 should be replaced with PublicNetAddr2, PublicNetAddr3, so just can utilize the logical channel of above-mentioned reservation, conversation is carried out smoothly.
When the PCC 16655551234 of private network as called, when making a call by the pc user's of public network PCC or telephone subscriber's GW, ONLY Server 101 receives call signaling, at first inquire about the address of PCC 16655551234 to User Server 102, find PublicNetAddr1, the MGCP data are sent to PublicNetAddr1, the ATT of query router NAT, find corresponding PrivateNetAddr1, the MGCP data are sent to PCC 16655551234.After the call signaling passage was set up, the data of PCC16655551234 loopback MGCP should comprise RTP and RTCP address, according to the agreement regulation, should be PrivateNetAddr2, PrivateNetAddr3.If but send private net address, can cause calling party's speech data can't correctly send to PCC16655551234, so PrivateNetAddr2, PrivateNetAddr3 should be replaced with PublicNetAddr2, PublicNetAddr3, carry out the transmission of speech data like this with regard to the logical channel of having utilized above-mentioned reservation.
Technical solution of the present invention can be applicable to any VoIP operation system.As be the interoperability of test I P telephony gateway (Master, Refiner, Expert), with a H.323 application of on PC, carrying out IP phone of agreement realization.This is applied in and has also run into the problem same with One Number Link You under the private network environment.Technical solution of the present invention is incorporated in the above-mentioned application, and different is: call signaling uses H.225 agreement, sets up passage with TCP.Set up control channel H.245 then, set up a logical channel at last.But the basic thought and the ONLY of call setup have something in common.After improving according to this scheme, it also can be conversed smoothly under the private network environment, passed through the basic function checking and big the calling measures examination.
In sum, the present invention program is simple and easy to do, has good practicability and reliability.
Claims (6)
1, a kind of implementation method of ip voice business of private network is characterized in that this method may further comprise the steps at least:
A) the private user pc client is after the VoIP server sends login request message, initiate n TCP/UDP to address server and connect, the value of n is that private user pc client and VoIP server are finished call signaling passage that once conversation need foundation and total port number of logical channel;
B) address server sends to VoIP server and private user pc client respectively with public network address and port numbers through after the network address translation (nat) in the connection message that is received;
C) in the address field that the VoIP server is recorded in this pc client with the public network address and the port numbers of corresponding call signaling passage, the private user pc client is recorded in the public network address and the port numbers of counterlogic passage in the corresponding address field.
2, the implementation method of ip voice business according to claim 1 is characterized in that further may further comprise the steps:
D) pc client of private user is provided with timing mechanism, and making exceeds schedule time does not receive when calling out message, repeating step a), step b), step c).
3, the implementation method of ip voice business according to claim 1 is characterized in that:
In the described step b), address server directly sends to the private user pc client with the public network address and the port numbers through after the NAT conversion of counterlogic passage.
4, the implementation method of ip voice business according to claim 1 is characterized in that:
In the described step b), address server sends to the VoIP server with public network address and the port numbers through after the NAT conversion in the connection message that is received, and by the VoIP server public network address and the port numbers of counterlogic passage is sent to this pc client in the response message of response private user pc client logging request.
5, a kind of system that realizes private network ip voice business, at least comprise ip voice business (VoIP) server that connects by IP network, pc client, the gatekeeper, gateway and the switching equipment and the telephone terminal that connect by public switch telephone network, wherein pc client provides the pc user to carry out voice call, realize protocol processes and the conversion of calling out control and speech data, the VoIP server is realized the login authentication of pc client, the control that response is called out the request of access and carried out call proceeding, gateway is the equipment that connects IP network and public switch telephone network, and the gatekeeper provides the locating function of gateway address; It is characterized in that:
This system further comprises an address acting server, be connected with system by IP network, it receives the TCP/UDP that private user pc client sends and connects message after login, and the pc client that sends to VoIP server and private user respectively through the public network address after the NAT conversion and port numbers that will be wherein;
Described VoIP server is recorded in the address of corresponding call signaling passage in the address field of this pc client, the private user pc client is recorded in corresponding address field with the address of counterlogic passage, is private user pc client and VoIP server realization conversation reservation call signaling passage and logical channel.
6, ip voice operation system according to claim 3 is characterized in that:
Further, described VoIP server is made up of service server and client server.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011356103A CN1170393C (en) | 2001-10-04 | 2001-10-04 | Method and system of realizing IP speech service of private network |
| PCT/CN2002/000371 WO2003030463A1 (en) | 2001-10-04 | 2002-05-30 | A method and system for realizing ip voice service at private network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011356103A CN1170393C (en) | 2001-10-04 | 2001-10-04 | Method and system of realizing IP speech service of private network |
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| CN1411220A true CN1411220A (en) | 2003-04-16 |
| CN1170393C CN1170393C (en) | 2004-10-06 |
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|---|---|---|---|
| CNB011356103A Expired - Fee Related CN1170393C (en) | 2001-10-04 | 2001-10-04 | Method and system of realizing IP speech service of private network |
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| CN (1) | CN1170393C (en) |
| WO (1) | WO2003030463A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100735357B1 (en) * | 2004-12-21 | 2007-07-04 | 삼성전자주식회사 | Method and system for providing a private voice call service for a subscriber in a mobile communication system and a wireless soft switch apparatus thereof |
| CN101146068B (en) * | 2005-04-25 | 2010-06-23 | 华为技术有限公司 | Private network user and system and method for network intercommunication with QoS network |
| CN106331187A (en) * | 2015-06-18 | 2017-01-11 | 中兴通讯股份有限公司 | NAT (Network Address Translation) penetration method, device and system |
| CN114363117B (en) * | 2021-12-13 | 2023-11-28 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Heterogeneous interconnection method and system for wireless subnetworks |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6674746B1 (en) * | 1999-07-22 | 2004-01-06 | Nortel Networks Limited | Method and apparatus for voice over internet protocol swapping in a communications system |
| KR100345769B1 (en) * | 1999-11-25 | 2002-07-24 | 삼성전자 주식회사 | Method for communication between internet keyphone systems equipped with VoIP |
-
2001
- 2001-10-04 CN CNB011356103A patent/CN1170393C/en not_active Expired - Fee Related
-
2002
- 2002-05-30 WO PCT/CN2002/000371 patent/WO2003030463A1/en not_active Application Discontinuation
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| CN1170393C (en) | 2004-10-06 |
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