CN101207547B - System and method for implementing intercommunication of public switched telephone network and IP network - Google Patents
System and method for implementing intercommunication of public switched telephone network and IP network Download PDFInfo
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Abstract
The invention discloses a method which realizes the intercommunication of a public switched telephone network and an IP network, and the method comprises the following steps: A, terminals of the public switched telephone network send out initial signaling messages 7 to gateways which are intercommunicated with the IP network; B, the gateways write IP parameters which contain the IP addresses of the gateways into the initial signaling messages 7, and send out the messages to called parties in the IP network. The invention also discloses a method which realizes the intercommunication of the public switched telephone network and the IP network, and the method comprises the following steps: C, call-initiating parties in the IP network send out expanded signaling messages 7 to gateways which are intercommunicated with the public switched telephone network; D, the gateways record the IP parameters of the call-initiating parties, and send out initial signaling messages 7 which do not containthe IP parameters to terminals in the public switched telephone network. The invention also discloses a system which realizes the intercommunication of the public switched telephone network and the IP network. Applying the invention, the intercommunication of the two networks can be realized without the translation and the packing of the signaling messages at the gateways which are positioned at the boundary of the IP network, thereby greatly reducing the complexity of the gateways and improving the whole performance of the IP network.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a system for implementing interworking between a public switched telephone network and an IP network.
Background
VoIP (voice over internet protocol) technology is a technology for transmitting voice or video over TCP/IP protocol. It provides internet-based, cost-effective voice services and can be further extended to voice over IP services. VoIP adopts the technology of computer communication, such as packetization and digital transmission, firstly carries out compression coding processing on voice data, then packs the data according to related protocols such as IP, and the data packets are transmitted to a receiving place through an IP network and then are connected in series again, and are decoded, decompressed and restored into original voice signals.
The existing VoIP uses IP signaling protocol or self-owned signaling protocol for service control, and when they are intercommunicated with PSTN (public switched telephone network), the existing solution needs to set signaling translation gateway at the network boundary of both parties, translate the signaling transmitted across the network, and then transmit. The structure of signaling interworking between the existing PSTN and the IP network is shown in fig. 1: the public switched telephone network 110 and the IP network 120 perform voice and signaling transmission through gateways, wherein the signaling network gateway 130 is used for interpreting signaling transmitted between the two networks, the multimedia gateway 140 is used for converting between a voice data format of the public switched telephone network and a voice data format of the IP network, and the multimedia gateway controller 150 is used for connecting the signaling gateway and the multimedia gateway and coordinating cooperation between the two gateways.
In fig. 1, when the PSTN and the IP network make a telephone call within a network, signaling within the respective networks is used. Where PSTN uses signaling No. 7 for call control and management and IP networks use h.232, SIP, or custom signaling for control. When two networks require a cross-network call, the conversion of call signaling must be done at the gateway. Fig. 2 shows a flow diagram of the PSTN interworking with IP networks using SIP signaling through signaling translation:
step 201: the terminal 1 located in the PSTN network initiates a call to the called terminal 2 by sending an initial address message IAM of the signaling No. 7.
Step 202: the border IAM message at the IP network is translated by SG/MGC11 into an INVITE message for SIP signaling.
Step 203: the INTITE message is transmitted to the other side of the IP network, and then translated into an IAM message by SG/MGC22, and sent to terminal 2.
Step 204: and after receiving the IAM message, the terminal 2 returns an ACM idle message to the terminal 1.
Step 205: the ACM message at the border of the IP network is translated by SG/MGC22 into the RINGING message of the SIP signaling.
Step 206: after the RINGING message is transmitted to the other side of the IP network, an ACM message translated into signaling number seven by SG/MGC11 is sent to terminal 1 indicating that the called terminal is idle at this time.
And when the two parties end the call, if the terminal 1 first ends the call connection, the terminal 2 sends an end message to the terminal 1. In the process of signaling interaction between terminal 1 and terminal 2 through messages, messages based on signaling number seven need to be converted into SIP signaling messages through a gateway on one side of an IP network and transmitted to the other side of the network, and then the SIP signaling messages are converted into signaling number seven through the gateway and transmitted to terminal 2, as shown in the flow chart of fig. 2. That is, calls, answers, busy calls, hang-ups, etc. between two terminals need to be translated at the boundary of two networks and then become signaling messages which can be recognized by each other for transmission.
When the PSTN and the IP network are communicated by a signaling package mode, a No. seven signaling message of the terminal 1 is packaged in an IP signaling message for transmission at one side of the IP network, and when the IP signaling message is transmitted to the other side of the IP network, the No. seven signaling message packaged in the IP signaling message is taken out and delivered to the terminal 2 for processing.
From the above analysis, the prior art has the following disadvantages and shortcomings:
firstly, the intercommunication between PSTN and IP network is realized by translating the signaling on the gateway, the signaling of PSTN needs to be analyzed, and then the parameters are mapped to the corresponding domain of the signaling of IP network for transmission. This conversion increases the complexity of the gateway and, once the translation function of the gateway is faulty, all the signaling translations through the gateway will be faulty, eventually resulting in a functional bottleneck of the network. The intercommunication between PSTN and IP network is realized by wrapping signaling on gateway, and the two signaling are mechanically overlapped together and can not be fused, thus saving the conversion of signaling, but causing the repetition of signaling message and seriously wasting network bandwidth resource.
Secondly, because the number of gateways between two networks is limited, as the number of users increases, a large number of messages in the networks are queued for processing, which easily causes message congestion, reduces call completing rate and causes performance bottleneck of the gateways.
Disclosure of Invention
The invention aims to provide a method for realizing intercommunication between a public switched telephone network and an IP network, which aims to solve the problems that the intercommunication between a PSTN and the IP network is carried out in a signaling translation or wrapping mode in the prior art, the complexity of a gateway is increased, network bandwidth resources are wasted, and network function bottlenecks are easily caused.
Another objective of the present invention is to provide a system for implementing interworking between a public switched telephone network and an IP network, so as to overcome the problem that in the prior art, two networks are intercommunicated by signaling translation or signaling encapsulation, which increases the complexity of a gateway and easily causes a network bottleneck.
In order to solve the technical problems, the invention provides the following technical scheme:
a method for realizing intercommunication between public switched telephone network and IP network includes steps:
A. the terminal in the public telephone exchange network sends the initial seventh signaling message to the gateway communicating with the IP network;
B. and the gateway writes the IP parameters containing the IP address of the gateway into the initial signaling message No. seven and sends the message to a called party in the IP network.
The step B specifically comprises the following steps:
b1, gateway communicating with IP network receives initial seven signaling message, the said initial seven signaling message includes corresponding domain, and/or user-user parameter domain;
b2, the gateway writes the IP parameter containing its own IP address into the user-user parameter domain of the initial signaling message No. seven to form an extended signaling message No. seven;
b3, the gateway sends the extended seventh signaling message to the called party in the IP network.
The corresponding domain in step B1 contains source identification, destination identification and call property parameters.
The called party in the IP network is specifically another gateway in the IP network, or a terminal in the IP network.
The method further comprises the following steps:
the called party in the IP network replies an extended seventh signaling message containing the IP parameter of the called party to the gateway;
the gateway records the IP parameter of the called party and replies an initial No. seven signaling message which does not contain the IP parameter to a terminal in a public switched telephone network.
A method for realizing intercommunication between public switched telephone network and IP network includes steps:
C. the calling initiator in the IP network sends the signaling message of number seven to the gateway communicating with the public telephone exchange network;
D. the gateway records the IP parameters of the calling initiator and sends an initial number seven signaling message not containing the IP parameters to a terminal in a public switched telephone network.
The step C is specifically as follows:
c1, the calling initiator in IP network writes the IP parameter containing its own IP address into the user-user parameter domain of the initial signaling message to form an expanded signaling message No. seven;
c2, the calling initiator sends the extended seventh signaling message to a gateway interworking with public switched telephone network.
The method further comprises the following steps:
the terminal in the public telephone exchange network replies the initial seventh signaling message to the gateway intercommunicating with the IP network;
and the gateway replies an extended seventh signaling message containing the IP parameters to a calling initiator in the IP network.
A system for realizing the intercommunication between public telephone exchange network and IP network includes the public telephone exchange network terminal, the gateway and IP network terminal which are intercommunicated with the IP network,
the public switched telephone network terminal comprises:
the terminal sends an initial signaling unit, which is used for sending an initial No. seven signaling message to a gateway intercommunicated with an IP network;
the terminal receives an initial signaling unit, which is used for receiving an initial No. seven signaling message replied by the gateway intercommunicated with the IP network;
the gateway interworking with the IP network includes:
a signaling receiving unit, configured to receive a signaling message sent by the public switched telephone network terminal or the IP network terminal;
an IP parameter writing unit, configured to write an IP parameter including the gateway IP address into a user-user parameter domain of the initial signaling message seven to form an extended signaling message seven;
a record IP parameter unit, configured to record the IP parameter of the IP network terminal in the gateway;
a signaling sending unit, configured to send a signaling message to the public switched telephone network terminal or the IP network terminal;
the IP network terminal comprises:
the terminal receives an extended signaling unit, which is used for receiving an extended No. seven signaling message sent by the gateway;
and the terminal replies an extended signaling unit for replying an extended seventh signaling message containing the IP parameter of the terminal to a gateway intercommunicated with the IP network.
The receiving signaling unit includes:
receiving an initial signaling unit, configured to receive an initial signaling message # seven sent by the public switched telephone network terminal;
and the receiving expansion signaling unit is used for receiving the expansion No. seven signaling message replied by the IP terminal.
The signaling sending unit comprises:
a signaling unit for sending extended signaling, which is used for sending the signaling message of the extended No. seven to an IP network terminal;
and the initial replying signaling unit is used for replying the initial No. seven signaling message which does not contain the IP parameter to the public switched telephone network terminal.
A system for realizing the intercommunication between public telephone exchange network and IP network includes IP network terminal, gateway and public telephone exchange network terminal,
the IP network terminal comprises:
the terminal sends the expanded signaling unit, is used for sending the seventh signaling message of expansion including IP parameter of the terminal to the gateway communicating with public telephone exchange network;
the terminal receives an extended signaling unit, which is used for receiving an extended seventh signaling message replied by the gateway;
the gateway interworking with a public switched telephone network includes:
a signaling receiving unit, configured to receive a signaling message sent by the public switched telephone network terminal or the IP network terminal;
an IP parameter writing unit, configured to write an IP parameter including the gateway IP address into a user-user parameter domain of the initial signaling message seven to form an extended signaling message seven;
a record IP parameter unit, configured to record the IP parameter of the IP network terminal in the gateway;
a signaling sending unit, configured to send a signaling message to the public switched telephone network terminal or the IP network terminal;
the public switched telephone network terminal comprises:
the terminal replies the initial signaling unit, is used for replying the signaling message of the initial No. seven to the gateway communicating with public switched telephone network;
the terminal receives the initial signaling unit, which is used to receive the initial seventh signaling message replied by the gateway intercommunicating with the public switched telephone network.
The receiving signaling unit includes:
an extended signaling receiving unit, configured to receive an extended signaling message No. seven sent by the IP terminal;
and the receiving initial signaling unit is used for receiving the initial No. seven signaling message replied by the public switched telephone network terminal.
The signaling sending unit comprises:
sending an initial signaling unit, which is used for sending an initial No. seven signaling message which does not contain the IP parameter to a public switched telephone network terminal;
and the reply extension signaling unit is used for replying the extension seventh signaling message to the IP network terminal.
According to the technical scheme provided by the invention, the invention has the following characteristics and advantages:
firstly, the IP address of the network is written into the user-user parameter domain of the signaling message No. seven, so that when the PSTN interacts with the IP network, the signaling translation or package is not needed at the gateway at the boundary of the IP network, but the signaling message No. seven written with the IP parameter is directly transmitted in the IP network, thereby greatly reducing the complexity of the gateway, not needing to translate or package the signaling message No. seven, reducing the signaling error caused by the signaling translation and improving the integral function of the IP network.
Secondly, since the No. seven signaling which is not translated or wrapped can be directly transmitted between the PSTN and the IP network, a large amount of signaling to be processed is not easy to generate at the gateway, the call completing rate of the network call is improved, and the performance of the network is enhanced.
Drawings
FIG. 1 is a diagram of signaling interworking between a PSTN and an IP network;
FIG. 2 is a flow chart of the interworking between PSTN and IP networks through signaling translation;
FIG. 3 is a flow chart of a method of the present invention in which the calling party is a PSTN terminal;
FIG. 4 is a flow chart of the preferred embodiment of the present invention in which the calling party is a PSTN terminal;
FIG. 5 is a flow chart of the present invention for organizing signaling messages;
FIG. 6 is a flow chart of parsing signaling messages in accordance with the present invention;
FIG. 7 is a flowchart of a method for making a calling party an IP network terminal according to the present invention;
FIG. 8 is a flow chart of the preferred embodiment of the present invention in which the calling party is a terminal of an IP network;
FIG. 9 is a block diagram of a preferred embodiment of the system of the present invention;
FIG. 10 is a block diagram of a preferred embodiment of yet another system of the present invention.
Detailed Description
The core of the invention is to provide a method for realizing the intercommunication between the public telephone exchange network and the IP network, the terminal in the public telephone exchange network sends the initial No. seven signaling message to the gateway intercommunicating with the IP network, the gateway writes the IP parameter containing the IP address of the gateway into the initial No. seven signaling message and sends the message to the called party in the IP network; or the calling initiator in the IP network sends the extended seventh signaling message to a gateway intercommunicating with the public switched telephone network, the gateway records the IP parameter of the calling initiator and sends the initial seventh signaling message without the IP parameter to the terminal in the public switched telephone network.
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
The method flow of the invention that the calling party is the PSTN terminal is shown in figure 3:
step 301: a terminal in the public switched telephone network sends an initial number seven signaling message to a gateway.
The seventh signaling message contains a corresponding domain and/or a user-user parameter domain, wherein the corresponding domain carries parameters such as a calling number, a called number, calling properties and the like.
Step 302: the gateway writes the IP parameter of the gateway into the initial seventh signaling message.
The gateway intercommunicating with the IP network receives the initial signaling message No. seven and writes the IP parameter containing the IP address of the gateway into the user-user parameter domain of the initial signaling message No. seven to form an expanded signaling message No. seven.
The user-user parameter field of the initial signaling message seven is used for transferring information between users, and the format of the user-user parameter field can be defined by users, and the length of the parameter field ranges from 3 bytes to 131 bytes. When the length of the parameter is within the specified length range, the user-user parameter domain does not affect the analysis and processing of other domains in the seventh signaling message by the PSTN. The invention includes the IP addresses of calling and called parties in IP network, and other parameters needed by calling in IP network in the user-user parameter domain, and the length of the parameters is in the range specified by the user-user parameter domain. Therefore, the expanded seven signaling message containing the IP address can be directly transmitted in two networks of PSTN and IP network, in the PSTN network, the parameters in the user-user parameter domain are not processed, only transparent transmission is carried out, the exchanger in the PSTN only needs to analyze the initial seven signaling parameters by the existing flow, and the existing call can be completed; in the IP network, the gateway can find the IP parameters of the calling counterpart from the user-user parameter field of the signaling message No. seven without additionally defining the signaling format.
Step 303: the gateway sends the extended seventh signaling message to the IP network terminal.
After receiving the extended seventh signaling message, the called party in the IP network replies the extended seventh signaling message containing the IP parameter of the called party to the gateway intercommunicating with the IP network, then the gateway records the IP parameter of the called party and replies the initial seventh signaling message not containing the IP parameter to the terminal in the public switched telephone network.
The flow of the preferred embodiment of the present invention in which the calling party is a PSTN terminal is shown in fig. 4, in which the terminal 1 is located in the PSTN and the terminal 2 is located in the IP network:
step 401: the terminal 1 located in the PSTN sends an initial IAM message to the SG/MGC.
Where the initial IAM is an initial address message for signaling No. seven, the terminal 1 located in the PSTN transmits the initial IAM message to a SG/MGC (signaling gateway/multimedia network controller) interworking with an IP network.
Step 402: and the SG/MGC writes the IP parameters containing the IP address of the current gateway into the received initial IAM message.
The SG/MGC writes the IP parameters containing the current gateway IP address into the user-user parameter field of the initial IAM message, and the expanded IAM message can be transmitted on the IP network without converting the signaling format.
Step 403: the SG/MGC transmits an extended IAM message containing IP parameters to the terminal 2 located in the IP network.
Step 404: after receiving the extended IAM message containing the IP address, the terminal 2 writes the IP address-containing IP address into the replied initial ACM message.
Step 405: the terminal 2 in the IP network sends the extended ACM message containing the IP parameters to the SG/MGC.
Step 406: the SG/MGC sends an initial ACM message containing no IP parameters to the terminal 1 located in the PSTN.
Specifically, the flow of organizing the signaling message in step 402 is shown in fig. 5:
step 501: and writing IP network parameters such as IP addresses, IP address properties and the like into a user-user parameter field of the initial seventh signaling message. The format of the IP network parameter domain is shown in table 1 below:
| the parameter types are as follows: IAM, ACM, ANM, etc |
| Destination IP address: |
| source IP address: |
| destination ID: |
| a source ID: |
| and (3) marking the network access: (from or to the outer net) |
| Calling parameters: |
step 502: command parameters such as calling number, called number, speech path number and calling property are organized.
Step 503: command headers are added to the parameters.
Step 504: adds OPC (destination signaling code) and DPC (source signaling code) to the message.
When the terminal 1 establishes a call through the IAM message, it does not know the IP address of the called IP terminal, so it is not necessary to fill the destination IP address in table 1, and only the IP address of the gateway interworking with the IP network is filled in the source IP address field.
Specifically, in step 404, the terminal 2 parses the received IAM message to obtain the signaling parameter, and a flow of parsing the signaling message is shown in fig. 6:
step 601: and extracting the OPC and DPC in the signaling message.
OPC and DPC are used for checking the call stated in the signaling message, when DPC is not this signaling point, can position and forward the message according to the stated call or called number of it.
Step 602: and judging the specific type of the signaling.
Judging whether the signaling is initiating call, responding call, answering or hanging up, when the signaling is initial information IAM information of a call, establishing data of the call according to parameters of the IAM information as the call of subsequent information.
Step 603: and extracting signaling parameters such as a calling number, a called number, a speech path number, calling properties and the like.
Step 604: and extracting parameters of the IP network, such as the IP address, the IP address property and the like, and sending data to the IP network according to the IP address.
The method flow of the invention for the calling party to be the IP network terminal is shown in figure 7:
step 701: the calling initiator in the IP network sends the extended seventh signaling message to the gateway intercommunicating with the PSTN network.
The calling initiator in the IP network writes the IP parameter containing the IP address into the user-user parameter domain of the initial signaling message No. seven to form an extended signaling message No. seven, and sends the extended signaling message No. seven to the gateway intercommunicated with the PSTN network.
Step 702: the gateway records the IP parameters of the call initiator in the IP network.
After receiving the extended seventh signaling message sent by the calling initiator in the IP network, the gateway intercommunicating with the PSTN network records the IP parameter of the calling initiator in the user-user parameter domain of the message, so as to reply the extended seventh signaling message to the calling initiator according to the recorded IP parameter next time.
Step 703: the gateway sends an initial number seven signaling message to the public switched telephone network terminal.
After receiving the initial No. seven signaling message sent by the gateway, the terminal in the public telephone exchange network replies the initial No. seven signaling message to the gateway intercommunicating with the IP network, and then the gateway writes the IP parameter containing the IP address into the replied initial No. seven signaling message to form an expanded No. seven signaling message and sends the message to the calling initiator in the IP network.
The flow of the preferred embodiment of the present invention in which the calling party is an IP network terminal is shown in fig. 8, in which the terminal 11 is located in the IP network, the terminal 22 is located in the PSTN:
step 801: the terminal 11 located in the IP network sends an extended REL message to the SG/MGC.
The terminal 11 in the IP network writes the IP parameters including the IP address of the terminal in the user-user parameter field of the initial REL message to form an extended REL message, and sends the extended REL message to the SG/MGC.
Step 802: the SG/MGC records the IP parameters of the terminal 11 in the user-user parameter field of the received extended REL message.
Step 803: the SG/MGC sends an initial REL message, which does not contain the IP parameters of the terminal 11, to the public switched telephone network terminal 22.
Step 804: after receiving the initial REL message, the terminal 22 replies the initial RLC message to the SG/MGC.
Step 805: the SG/MGC writes the IP parameters containing the current gateway IP address in the received initial RLC message.
The SG/MGC writes the IP parameters containing the current gateway IP address into the user-user parameter field of the initial RLC message, and the expanded RLC message can be transmitted on the IP network without converting the signaling format.
Step 806: the SG/MGC transmits the extended RLC message including the IP parameters to the terminal 11 located in the IP network.
The block diagram of the preferred embodiment of the system of the present invention is shown in FIG. 9:
the system comprises: a public switched telephone network terminal 910, an IP network terminal 930 and a gateway 920 for connecting the two terminals to an IP network.
The public switched telephone network terminal 910 comprises a terminal sending initial signaling unit 911 for sending an initial signaling message # seven to a gateway interworking with an IP network; the terminal receives an initial signaling unit 912, configured to receive an initial signaling message # seven replied by a gateway interworking with the IP network.
The gateway 920 interworking with the IP network includes a receiving signaling unit 921 for receiving a signaling message sent by a public switched telephone network terminal or an IP network terminal; an IP parameter writing unit 924, configured to write the IP parameter including the gateway IP address into a user-user parameter domain of the initial signaling message # seven to form an extended signaling message # seven; a signaling sending unit 925, configured to send a signaling message to a public switched telephone network terminal or an IP network terminal; a record IP parameter unit 928, configured to record the IP parameter of the IP network terminal in the gateway.
The signaling receiving unit 921 includes an initial signaling receiving unit 922, configured to receive an initial signaling message # seven sent by a public switched telephone network terminal; and an extended signaling receiving unit 923, configured to receive an extended signaling message No. seven replied by the IP terminal. The sending signaling unit 925 includes a reply initial signaling unit 926 for replying an initial signaling message No. seven including IP parameters to the public switched telephone network terminal; and an extended signaling sending unit 927, configured to send an extended signaling message No. seven to the IP network terminal.
The IP network terminal 930 includes a terminal reply extension signaling unit 931 configured to reply an extension number seven signaling message including the terminal IP parameter to a gateway interworking with the IP network; the terminal receives the extended signaling unit 932, which is used to receive the extended signaling message No. seven sent by the gateway.
A block diagram of another preferred embodiment of the system of the present invention is shown in fig. 10:
the system comprises: a public switched telephone network terminal 1010, an IP network terminal 1030 and a gateway 1020 for connecting the two terminals and interworking with a public switched telephone network.
The public switched telephone network terminal 1010 comprises a terminal reply initial signaling unit 1011 for replying an initial number seven signaling message to a gateway intercommunicating with a public switched telephone network; the terminal receives an initial signaling unit 1012 for receiving an initial signaling message # seven replied by the gateway interworking with the public switched telephone network.
The gateway 1020 interworking with the public switched telephone network includes a receiving signaling unit 1021 for receiving a signaling message sent by a terminal of the public switched telephone network or an IP network terminal; an IP parameter writing unit 1024, configured to write the IP parameter including the gateway IP address into a user-user parameter domain of the initial signaling message seven to form an extended signaling message seven; a signaling sending unit 1025 for sending signaling messages to a public switched telephone network terminal or an IP network terminal; a record IP parameter unit 1028, configured to record the IP parameters of the IP network terminal in the gateway.
Wherein, the signaling receiving unit 1021 includes a signaling receiving initial unit 1022, which is used for receiving an initial signaling message # seven replied by the public switched telephone network terminal; and the receive extension signaling unit 1023 is used for receiving the extension signaling message No. seven sent by the IP terminal. The signaling sending unit 1025 comprises a signaling sending initial unit 1026 for sending an initial signaling message No. seven containing IP parameters to the pstn terminal; and a reply extension signaling unit 1027, configured to reply the extension seventh signaling message to the IP network terminal.
The IP network terminal 1030 includes a terminal send extension signaling unit 1031 for sending an extension number seven signaling message containing the terminal IP parameters to a gateway interworking with a public switched telephone network; the terminal receives the extended signaling unit 1032, which is used to receive the extended signaling message # seven replied by the gateway.
It can be known from the above embodiments that the signaling messages such as the initial IAM in the IP network are not translated or wrapped, and the IP address of the gateway is only written into the user-user parameter domain of the initial seventh signaling at the gateway communicating with the IP network, so as to form the extended seventh signaling message, and then the extended seventh signaling message can be transmitted on the IP network.
While the present invention has been described with respect to the embodiments, those skilled in the art will appreciate that there are numerous variations and permutations of the present invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and modifications as fall within the true spirit of the invention.
Claims (12)
1. A method for realizing intercommunication between public switched telephone network and IP network is characterized by comprising the following steps:
A. the terminal in the public telephone exchange network sends the initial seventh signaling message to the gateway communicating with the IP network;
B. the gateway writes the IP parameters containing its own IP address into the initial signaling message No. seven and sends the message to the called party in the IP network, wherein,
the step B specifically comprises the following steps:
b1, receiving an initial seventh signaling message by a gateway intercommunicating with the IP network, wherein the initial seventh signaling message comprises a corresponding domain and a user-user parameter domain;
b2, the gateway writes the IP parameter containing its own IP address into the user-user parameter domain of the initial signaling message No. seven to form an extended signaling message No. seven;
b3, the gateway sends the extended seventh signaling message to the called party in the IP network.
2. The method of claim 1, wherein the corresponding domain in step B1 contains source identifier, destination identifier and call property parameters.
3. The method according to claim 1, characterized in that the called party in the IP network is specifically another gateway in the IP network, or a terminal in the IP network.
4. The method of claim 1, further comprising:
the called party in the IP network replies an extended seventh signaling message containing the IP parameter of the called party to the gateway;
the gateway records the IP parameter of the called party and replies an initial No. seven signaling message which does not contain the IP parameter to a terminal in a public switched telephone network.
5. A method for realizing intercommunication between public switched telephone network and IP network is characterized by comprising the following steps:
C. the calling initiator in the IP network sends the signaling message of number seven to the gateway communicating with the public telephone exchange network;
D. the gateway records the IP parameter of the calling initiator and sends an initial No. seven signaling message which does not contain the IP parameter to a terminal in a public switched telephone network; wherein,
the step C is specifically as follows:
c1, the calling initiator in IP network writes the IP parameter containing its own IP address into the user-user parameter domain of the initial signaling message to form an expanded signaling message No. seven;
c2, the calling initiator sends the extended seventh signaling message to a gateway interworking with public switched telephone network.
6. The method of claim 5, further comprising:
the terminal in the public telephone exchange network replies the initial seventh signaling message to the gateway intercommunicating with the IP network;
and the gateway replies an extended seventh signaling message containing the IP parameters to a calling initiator in the IP network.
7. A system for realizing the intercommunication between public telephone exchange network and IP network includes the public telephone exchange network terminal, the gateway and IP network terminal which are intercommunicated with IP network,
the public switched telephone network terminal comprises:
the terminal sends an initial signaling unit, which is used for sending an initial No. seven signaling message to a gateway intercommunicated with an IP network;
the terminal receives an initial signaling unit, which is used for receiving an initial No. seven signaling message replied by the gateway intercommunicated with the IP network;
the gateway interworking with the IP network includes:
a signaling receiving unit, configured to receive a signaling message sent by the public switched telephone network terminal or the IP network terminal;
an IP parameter writing unit, configured to write an IP parameter including the gateway IP address into a user-user parameter domain of the initial signaling message seven to form an extended signaling message seven;
a record IP parameter unit, configured to record the IP parameter of the IP network terminal in the gateway;
a signaling sending unit, configured to send a signaling message to the public switched telephone network terminal or the IP network terminal;
the IP network terminal comprises:
the terminal receives an extended signaling unit, which is used for receiving an extended No. seven signaling message sent by the gateway;
and the terminal replies an extended signaling unit for replying an extended seventh signaling message containing the IP parameter of the terminal to a gateway intercommunicated with the IP network.
8. The system of claim 7, wherein the receiving the signaling unit comprises:
receiving an initial signaling unit, configured to receive an initial signaling message # seven sent by the public switched telephone network terminal;
and the receiving expansion signaling unit is used for receiving the expansion No. seven signaling message replied by the IP terminal.
9. The system of claim 7, wherein the sending the signaling unit comprises:
a signaling unit for sending extended signaling, which is used for sending the signaling message of the extended No. seven to an IP network terminal;
and the initial replying signaling unit is used for replying the initial No. seven signaling message which does not contain the IP parameter to the public switched telephone network terminal.
10. A system for realizing the intercommunication between public telephone exchange network and IP network includes IP network terminal, gateway intercommunicating with public telephone exchange network and public telephone exchange network terminal,
the IP network terminal comprises:
the terminal sends the expanded signaling unit, is used for sending the seventh signaling message of expansion including IP parameter of the terminal to the gateway communicating with public telephone exchange network;
the terminal receives an extended signaling unit, which is used for receiving an extended seventh signaling message replied by the gateway;
the gateway interworking with a public switched telephone network includes:
a signaling receiving unit, configured to receive a signaling message sent by the public switched telephone network terminal or the IP network terminal;
an IP parameter writing unit, configured to write an IP parameter including the gateway IP address into a user-user parameter domain of the initial signaling message seven to form an extended signaling message seven;
a record IP parameter unit, configured to record the IP parameter of the IP network terminal in the gateway;
a signaling sending unit, configured to send a signaling message to the public switched telephone network terminal or the IP network terminal;
the public switched telephone network terminal comprises:
the terminal replies the initial signaling unit, is used for replying the signaling message of the initial No. seven to the gateway communicating with public switched telephone network;
the terminal receives the initial signaling unit, which is used to receive the initial seventh signaling message replied by the gateway intercommunicating with the public switched telephone network.
11. The system of claim 10, wherein the receiving the signaling unit comprises:
an extended signaling receiving unit, configured to receive an extended signaling message No. seven sent by the IP terminal;
and the receiving initial signaling unit is used for receiving the initial No. seven signaling message replied by the public switched telephone network terminal.
12. The system of claim 10, wherein the sending the signaling unit comprises:
sending an initial signaling unit, which is used for sending an initial No. seven signaling message which does not contain the IP parameter to a public switched telephone network terminal;
and the reply extension signaling unit is used for replying the extension seventh signaling message to the IP network terminal.
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| CN2006101678614A CN101207547B (en) | 2006-12-20 | 2006-12-20 | System and method for implementing intercommunication of public switched telephone network and IP network |
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| CN2006101678614A CN101207547B (en) | 2006-12-20 | 2006-12-20 | System and method for implementing intercommunication of public switched telephone network and IP network |
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| CN101207547B true CN101207547B (en) | 2011-05-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030016806A1 (en) * | 2001-07-18 | 2003-01-23 | Emerson Harry E. | Integrated telephone central office systems for integrating the internet with the public switched telephone network |
| CN1469605A (en) * | 2002-06-17 | 2004-01-21 | Lg电子株式会社 | Routing system in next generation open network and method for controlling the same route system |
| CN1501650A (en) * | 2002-11-14 | 2004-06-02 | 华为技术有限公司 | A call flow setting up method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030016806A1 (en) * | 2001-07-18 | 2003-01-23 | Emerson Harry E. | Integrated telephone central office systems for integrating the internet with the public switched telephone network |
| CN1469605A (en) * | 2002-06-17 | 2004-01-21 | Lg电子株式会社 | Routing system in next generation open network and method for controlling the same route system |
| CN1501650A (en) * | 2002-11-14 | 2004-06-02 | 华为技术有限公司 | A call flow setting up method |
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