CN115378914A - Calling method, calling device and calling equipment for weak signal coverage area - Google Patents

Abstract

The present application provides a calling method, calling device and calling equipment in a weak signal coverage area. The method includes: the number authentication server receives the first call request sent by the background server, performs number verification on the calling number in the first call request, and sends the verification result to the background server; Sent by the background server, when the verification result is successful, the background server forwards the first call request to the exchange server, the exchange server protocol conversion converts the first call request into a second call request, and sends the second call request to the SBC device, SBC The device sends a second call request to the core network, and the core network establishes a session between the calling user terminal and the called user terminal according to the second call request. Through the communication network structure, the construction period is short and the cost is low to support the lightweight Internet IP phone application, which solves the problems of large amount of transformation, long construction period and high cost.

Description

Calling method, calling device and calling equipment in weak signal coverage area

technical field

The present application relates to communication technology, in particular to a calling method, calling device and calling equipment in a weak signal coverage area.

Background technique

In recent years, the construction of GSM (Global System for Mobile Communications) base stations has yet to be improved in some areas with a large area and scattered population (such as the Ali pastoral area), resulting in weak or no signal in these pastoral areas, especially when herdsmen encounter In the event of an emergency, there is a lack of effective communication channels with the outside world, and they cannot provide their own location and positioning information, resulting in varying degrees of loss of life and property.

In the prior art, VoWiFi (Voice over WiFi) can enable users to use broadband Internet to initiate voice communication. Users across the country can sign up for VoWiFi services in CBSS (Concentrate Business Support System). The user's terminal chip needs to support VoWiFi, so when When the user is called, the mobile phone registered on the Internet side can be realized to ring or initiate a call.

However, in the prior art, the VoWiFi mode requires a large amount of transformation, a long construction period and high cost.

Contents of the invention

The application provides a calling method, a calling device and a calling user terminal during a game, which are used to solve the problems of large amount of transformation, long construction period and high cost in the prior art.

In one aspect of the present application, a method for calling a weak signal coverage area is provided, the method is applied to a calling number authentication server, and the method includes:

The number authentication server receives the first call request sent by the background server, and performs number verification on the calling number in the first call request, and sends the verification result to the background server; wherein, the first call request is sent by the calling user terminal to the background server Yes, when the verification result is successful, the first call request is forwarded to the exchange server by the background server, the first call request is converted into the second call request by the exchange server protocol, and the second call request is sent to the SBC (Session Border Controller) device, The second call request is sent to the core network by the SBC device, and the core network establishes a session between the calling user terminal and the called user terminal according to the second call request.

Further, the first call request is an IP (Internet Protocol) call request based on a SIP (Session initialization Protocol) protocol; the second call request is an IP call request based on SS7.

Further, the second call request is sent by the SBC device to the core network through the access network.

Another aspect of the present application provides a calling method in a weak signal coverage area, the method is applied to the called user terminal, and the method includes:

When receiving the first call instruction sent by the core network, send a third call request to the call forwarding server; wherein, the first call instruction is generated by the core network according to the fifth call request initiated by the calling user terminal, and the third call request is called The transfer server sends it to the SBC device, the SBC device is used to send the third call request to the switching server, the third calling request is converted into the fourth calling request by the switching server protocol, and sends the fourth calling request to the background server, and the background server according to the fourth call request The call request generates a second call instruction;

The second call instruction sent by the background server is received, and the session between the calling user terminal and the called user terminal is established.

Further, when receiving the first call instruction sent by the core network, sending a third call request to the call forwarding server, specifically including:

receiving the first call instruction sent by the core network;

Responding to the first call instruction, receiving a call transfer operation;

In response to the transfer operation, generate a third call request according to the calling number and the called number;

Send the third call request to the forwarding server.

In an embodiment, the third call request is sent to the SBC device through the access network by the call forwarding server.

Another aspect of the present application provides a calling device, including:

An acquisition module, configured to receive the first call request sent by the background server;

A processing module, configured to perform number verification on the calling number in the first call request;

The processing module is also used to send verification results to the background server;

Wherein, the first call request is sent by the calling user terminal to the background server, and the first call request is forwarded to the exchange server by the background server when the verification result is successful, and the first call request is converted into the second call request by the exchange server protocol , and send a second call request to the SBC device, the second call request is sent to the core network by the SBC device, and the core network establishes a session between the calling user terminal and the called user terminal according to the second call request.

Another aspect of the present application provides a call device, including: a memory and a processor;

storing computer-executable instructions in the memory;

The processor executes the computer-implemented instructions stored in the memory to implement the above method related to any one of the embodiments.

Another aspect of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored, and the computer-executable instructions are used to implement the method in any one of the foregoing embodiments when executed by a processor.

Another aspect of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, the method in any one of the foregoing embodiments is implemented.

The present application provides a calling method, calling device and calling equipment in a weak signal coverage area. The method includes: the number authentication server receives the first call request sent by the background server, performs number verification on the calling number in the first call request, and sends the verification result to the background server; Sent by the background server, when the verification result is successful, the background server forwards the first call request to the exchange server, the exchange server protocol conversion converts the first call request into a second call request, and sends the second call request to the SBC device, SBC The device sends a second call request to the core network, and the core network establishes a session between the calling user terminal and the called user terminal according to the second call request. Through the communication network structure, the construction period is short, the cost is low, and the lightweight Internet IP phone application is supported in a short and smooth manner, which solves the problems of large amount of transformation, long construction period and high cost.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

Fig. 1 provides a network architecture diagram of a call method in a weak signal coverage area for the present application;

FIG. 2 is a flow chart of a calling method in a weak signal coverage area provided by an embodiment of the present application;

FIG. 3 is a flow chart of a call method in a weak signal coverage area provided by another embodiment of the present application;

FIG. 4 is a flow chart of a call method in a weak signal coverage area provided by another embodiment of the present application;

FIG. 5 is a schematic structural diagram of a calling device provided in another embodiment of the present application;

Fig. 6 is a schematic structural diagram of a calling user terminal provided by another embodiment of the present application.

By means of the above drawings, specific embodiments of the present application have been shown, which will be described in more detail hereinafter. These drawings and text descriptions are not intended to limit the scope of the concept of the application in any way, but to illustrate the concept of the application for those skilled in the art by referring to specific embodiments.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

In recent years, for some areas with a large area and scattered population (such as Ali pastoral area), the construction of GSM base stations still needs to be improved, resulting in weak or no signal in these pastoral areas, especially when herdsmen encounter emergencies. Lack of effective communication channels with the outside world, unable to provide their own location and positioning information, resulting in varying degrees of loss of life and property.

In the prior art, VoWiFi can enable users to use the broadband Internet to initiate voice communication. Users across the country can sign up for VoWiFi services in CBSS. The user's terminal chip needs to support VoWiFi, so that when the user is called, the Internet side login can be realized. The mobile phone rings or initiates a call.

However, in the prior art, the VoWiFi mode requires a large amount of transformation, a long construction period and high cost.

In view of the above problems, the embodiments of the present application provide a calling method, calling device and calling equipment in a weak signal coverage area, aiming to solve the problems of large amount of transformation, long construction period and high cost of the existing technology. The technical concept of this application is: the number authentication server receives the first call request sent by the background server, and performs number verification on the calling number in the first call request, and sends the verification result to the background server; The user terminal is called to send to the background server. When the verification result is that the verification is successful, the background server forwards the first call request to the switching server, and the switching server converts the first calling request into a second calling request and sends the second calling request to the SBC device. For a call request, the SBC device sends a second call request to the core network, and the core network establishes a session between the calling user terminal and the called user terminal according to the second call request. Through the communication network structure, the construction period is short, the cost is low, and the lightweight Internet IP phone application is supported in a short and smooth manner, which solves the problems of large amount of transformation, long construction period and high cost.

As shown in FIG. 1 , the present application provides a network architecture diagram of a call method in a weak signal coverage area.

When the calling user is in a weak coverage area, where the weak coverage area is an area where the level intensity in a certain area is less than a preset threshold, the calling user initiates an Internet IP call based on the SIP protocol through the calling user terminal, and the calling user The calling number A, the called number B and the call request are sent to the background server; the number authentication server verifies the number A, confirms that it is a local user, and sends the confirmation result to the background server; the background server sends the calling number A, called The number B and the call request are sent to the exchange server; the exchange server converts the SIP signaling into NO.7 signaling and forwards the signaling to the SBC device; the SBC device signaling accesses the provincial access network and passes through the provincial access network Enter the operator's core network, page to the called party B through the operator's core network, and establish a session between the calling user terminal and the called user terminal, where the called party B displays the mobile phone number of the calling party A.

When the called user is in a weak coverage area, the calling party B initiates a call to the called party A under the weak coverage state based on the No. 7 signaling of the operator; Call A to hang up the phone and initiate call transfer through the call forwarding server; the provincial access network sends the calling number B and called number A to the call forwarding server, and the call forwarding server points to the corresponding SBC device, and routes the call to the SBC equipment; the SBC equipment routes the call to the switching server, and routes the call to the background server after signaling conversion; the background server makes the called A ring to realize the voice communication between the calling B and the called A.

As shown in Figure 2, an embodiment of the present application provides a calling method in a weak signal coverage area, the method includes the following steps:

S101. When the calling user terminal is in a weak signal coverage area, the calling user terminal sends a first call request to a background server.

In this step, the calling user terminal can be a mobile phone or an ipad, and when the calling user terminal is in a weak signal coverage area, the calling user terminal passes the TCP/IP (transmission Control Protocol/Internet Protocol, Transmission Control Protocol/Internet Protocol ) protocol actively sends the first phone call request to the background server. The first call request is an IP call request based on the SIP protocol. The background server is a voice call service that provides users with terminal Internet access.

S102. The background server sends a first call request to the number authentication server.

In this step, the background server sends the first call request to the number authentication server through the TCP/IP protocol.

S103. The number verification server performs number verification on the calling number in the first call request.

In this step, the number verification server provides services such as number verification (one-key login), secondary number verification, and three-factor verification. The application client initiates a number authentication service request to the SDK (Software Development Kit), the SDK receives the prefetch number request from the SDK server, and returns the authentication and authorization Token to the application client, and the application client returns Token and other information to the application server , the application server submits Token and other information to the SDK server for number authentication, and the SDK server returns the authentication result to the application server. Realize mutual authentication between the application server and the SDK server, and the application server sends the authentication result to the application client.

Relying on the operator's gateway authentication capability, it provides one-click registration and login of mobile phone number and local mobile phone number verification services for Internet applications of calling user terminals, and supports APP and H5 page multi-scenario applications. The official SDK supports multiple types of networks, has a high degree of intelligence, short interaction time, improves user experience, improves the conversion rate of new acquisitions, patented technology, reliable performance, and reduces the risk of empty number registration and login, password interception and theft.

The second number verification product refers to verifying whether a mobile phone number has been re-opened after a specified time.

Exemplary, registration/login/password retrieval: For scenarios such as registration/login/password retrieval, enterprises can use China Unicom’s secondary number verification product to identify whether the current registration and login number is secondary allocation, thereby avoiding secondary allocation. User privacy leakage and economic losses that may be caused by account users using the original account number.

The three-factor verification product provides consistency verification services for Unicom users' name, ID number, and mobile phone number.

Exemplary, real-name authentication: For real-name registration scenarios in financial, marriage, and other application systems, enterprises can use China Unicom's three-factor authentication product to identify user identity authenticity and information consistency, which helps prevent user risks. Pre-loan review: For financial scenarios such as credit card applications, enterprises can use Unicom's three-factor verification product to identify the authenticity of application user information and help users evaluate and make decisions about related matters.

S104. The number verification server sends a verification result to the background server.

In this step, after the interactive authentication between the application server and the SDK server is implemented, the application server sends the authentication result to the background server. The verification result is sent to the background server by TCP/IP protocol.

S105. When the verification result of the number server is successful, the background server sends the first call request to the exchange server.

In this step, when the background server receives the number server verification result through the TCP/IP protocol, the background server sends the first call request to the exchange server through the TCP/IP protocol.

S106. The switching server converts the protocol into the first call request into the second call request.

In this step, since the first call request is an IP call request based on the SIP protocol, the call requests that the SBC device can receive are IP call requests based on SS7. Therefore, switching server protocol conversion is required to convert the first call request into the second call request. The second call request is an IP call request based on SS7, which is convenient for subsequent calls.

No.7 signaling: also known as common channel signaling. That is, the signaling method of transmitting a group of voice channel signaling on a high-speed data link in a time-division manner, usually used between offices. The SS7 (Signaling System #7) network is an out-of-band data communication network, which is superimposed on the operator's switching network and is an important part of the supporting network.

S107. The switch server sends the second call request to the SBC device.

In this step, the exchange server sends the second call request to the SBC device through the TCP/IP protocol. The SBC equipment realizes that the platform proposed in this scheme is connected to the access network of the province.

S108. The SBC device sends the second call request to the core network.

In this step, the SBC device sends the second call request to the core network through the access network.

S109. The core network establishes a session between the calling user terminal and the called user terminal according to the second call request.

In this step, the core network responds to the second call request to page the called user terminal. When the user is paged, the core network executes the corresponding paging routing and establishes a session between the calling user terminal and the called user terminal. .

In the above technical solution, a calling method in a weak signal coverage area, the method is applied to the number authentication server, receives the first call request sent by the background server through the number authentication server, and performs number verification on the calling number in the first call request , and send the verification result to the background server; wherein, the first call request is sent by the calling user terminal to the background server, and when the verification result is that the verification is successful, the background server forwards the first call request to the switching server, and the switching server protocol conversion converts the second A call request is converted into a second call request, and the second call request is sent to the SBC device, and the SBC device sends the second call request to the core network, and the core network establishes a connection between the calling user terminal and the called user terminal according to the second call request. session. Through the communication network structure, the construction period is short, the cost is low, and the lightweight Internet IP phone application is supported in a short and smooth manner, which solves the problems of large amount of transformation, long construction period and high cost.

As shown in Figure 3, another embodiment of the present application provides a method for calling a weak coverage area, the method includes the following steps:

S201. When the called user terminal is in a weak coverage area, the core network generates a first call instruction according to a fifth call request initiated by the calling user terminal.

In this step, the calling user terminal sends a fifth call request to the core network through the provincial access network, and the core network performs corresponding processing according to the fifth call request initiated by the calling user terminal to obtain the first call instruction. The first call instruction is based on the call request of the called user terminal under the good condition of the Internet IP network call.

S202. The core network sends a first call instruction to the called user terminal.

In this step, the core network sends the first call instruction to the called user terminal through the provincial access network.

S203. The called user terminal sends a third call request to the call forwarding server.

In this step, when the called user terminal is in a bad situation of the Internet IP network call, the called user rejects the first call request, and then performs a call transfer to generate a third call request, and the called user terminal passes through the provincial access network to the third call request. The call forwarding server sends a third call request.

S204. The call forwarding server sends a third call request to the SBC device.

In this step, the call forwarding server sends the third call request to the SBC device through the access network. The call forwarding server provides the call forwarding service, and routes the call forwarding to the designated SBC device.

S205. The SBC device sends a third call request to the switching server.

In this step, the SBC device sends the third call request to the switching server through the TCP/IP protocol.

S206. The switching server converts the protocol to convert the third call request into a fourth call request.

In this step, since the third call request is an IP call request based on SS7, the call request that the background server can receive is an IP call request based on the SIP protocol. Therefore, protocol conversion by the switching server is required to convert the third call request into the fourth call request. The fourth call request is an IP call request based on the SIP protocol, which is convenient for subsequent calls.

S207. The exchange server sends a fourth call request to the background server.

In this step, the exchange server sends the fourth call request to the background server through the TCP/IP protocol.

S208. The background server generates a second call instruction according to the fourth call request.

In this step, the background server pages the called user terminal in response to the fourth call request, and the background server executes corresponding paging routing to generate a second call instruction.

S209. The background server sends the second call instruction to the called user terminal.

In this step, the background server sends the second call instruction to the called user terminal through the TCP/IP protocol.

S210. The called user terminal receives the second call instruction sent by the background server, and establishes a session between the calling user terminal and the called user terminal.

In this step, in response to the second call request, the called user terminal establishes a session between the calling user terminal and the called user terminal through the paging route established by the call forwarding server.

In the above technical solution, when the called user terminal is in a weak coverage area, when the called user terminal receives the first call instruction sent by the core network, it sends a third call request to the call forwarding server; wherein, the first call instruction is the core network generated by the network according to the fifth call request initiated by the calling user terminal, the call forwarding server sends the third call request to the SBC device, and the SBC device is used to send the third call request to the switching server, and the switching server converts the third call request into The fourth call request, and send the fourth call request to the background server, and the background server generates a second call instruction in response to the fourth call request; the called user terminal also receives the second call instruction sent by the background server, thereby establishing the calling user terminal and Conversation between called user terminals. In addition, when the called user terminal is in a weak coverage area, smooth communication can be achieved.

As shown in Figure 4, another embodiment of the present application provides a method for calling a weak signal coverage area, the method includes the following steps:

S301. When the called user terminal is in a weak coverage area, the core network generates a first call instruction according to a fifth call request initiated by the calling user terminal.

This step has been described in detail in S201 and will not be repeated here.

S302. The core network sends a first call instruction to the called user terminal.

This step has been described in detail in S202 and will not be repeated here.

S303. The called user terminal receives the first call instruction sent by the core network.

In this step, the called user terminal receives the first call instruction sent by the core network through the access network.

S304. The called user terminal receives a call transfer operation in response to the first call instruction.

In this step, when the called user terminal is in a weak coverage area, the called user terminal responds to the first call instruction, and the called user terminal needs to receive a transfer operation.

S305. The called user terminal generates a third call request according to the calling number and the called number in response to the call forwarding operation.

In this step, the called user terminal generates a third call request according to the calling number and the called number in response to the call transfer operation. Wherein, the third call request is a request that the called user terminal is in a weak coverage area and needs a new call route to establish a call.

S306. The called user terminal sends a third call request to the call forwarding server.

This step has been described in detail in S203 and will not be repeated here.

S307. The call forwarding server sends the third call request to the SBC device.

This step has been described in detail in S204 and will not be repeated here.

S308. The SBC device sends a third call request to the switching server.

This step has been described in detail in S205 and will not be repeated here.

S309. The switching server converts the protocol into the third call request into the fourth call request.

This step has been described in detail in S206 and will not be repeated here.

S310. The exchange server sends a fourth call request to the background server.

This step has been described in detail in S207 and will not be repeated here.

S311. The background server generates a second call instruction according to the fourth call request.

This step has been described in detail in S208 and will not be repeated here.

S312. The background server sends the second call instruction to the called user terminal.

This step has been described in detail in S209 and will not be repeated here.

S313. The called user terminal receives the second call instruction sent by the background server, and establishes a session between the calling user terminal and the called user terminal.

This step has been described in detail in S210 and will not be repeated here.

In the above technical solution, when the called user terminal is in a weak coverage area, when the called user terminal receives the first call instruction sent by the core network, it receives the transfer operation in response to the first call instruction; the called user terminal responds to In the call transfer operation, a third call request is generated according to the calling number and the called number; the called user terminal sends the third call request to the call transfer server. Send the third call request to the call forwarding server; wherein, the first call instruction is generated by the core network according to the fifth call request initiated by the calling user terminal, and the call forwarding server sends the third call request to the SBC device, and the SBC device is used to send the third call request to the SBC device. The exchange server sends the third call request, and the exchange server protocol conversion converts the third call request into a fourth call request, and sends the fourth call request to the background server, and the background server generates a second call instruction in response to the fourth call request; the called user terminal A second call instruction sent by the background server is also received, so as to establish a session between the calling user terminal and the called user terminal. And realize that when the called user terminal is in a weak coverage area, a new route can be built through the call forwarding server, so that the call can be made smoothly.

As shown in FIG. 5, a calling device 500 provided in another embodiment of the present application includes:

The processing module 502 is used for the number authentication server to receive the first call request sent by the background server, and perform number verification on the calling number in the first call request, and send the verification result to the background server; wherein, the first call request is the calling number The user terminal sends to the background server. When the verification result is successful, the first call request is forwarded to the switching server by the background server. The first call request is converted into a second call request by the switching server protocol, and the second call request is sent to the SBC device. request, the second call request is sent to the core network by the SBC device, and the core network establishes a session between the calling user terminal and the called user terminal according to the second call request.

The processing module 502 is further configured to send a third call request to the call forwarding server when the called user terminal receives the first call instruction sent by the core network; wherein, the first call instruction is the fifth call request initiated by the core network according to the calling user terminal. Generated by a call request, the third call request is sent to the SBC device by the call forwarding server, and the SBC device is used to send the third call request to the switching server, and the third call request is converted into a fourth call request by the switching server protocol, and sent to the background server Send a fourth call request, and the background server generates a second call instruction according to the fourth call request;

The second call instruction sent by the background server is received, and the session between the calling user terminal and the called user terminal is established.

In one embodiment, the processing module 802 is specifically used to:

The first call request is an IP call request based on the SIP protocol; the second call request is an IP call request based on SS7.

In one embodiment, the processing module 802 is specifically used to:

The second call request is sent by the SBC device to the core network through the access network.

In one embodiment, the processing module 802 is specifically used to:

When receiving the first call instruction sent by the core network, send the third call request to the call forwarding server, specifically including:

receiving the first call instruction sent by the core network;

Responding to the first call instruction, receiving a call transfer operation;

In response to the transfer operation, generate a third call request according to the calling number and the called number;

A third call request is sent to the forwarding server.

In one embodiment, the processing module 802 is specifically used to:

The third call request is sent to the SBC device through the access network by the call forwarding server.

As shown in FIG. 6 , an embodiment of the present application provides a calling user terminal 600 , and the calling user terminal 600 includes a memory 601 and a processor 602 .

Wherein, the memory 601 is used to store computer instructions executable by the processor;

The processor 602 implements various steps in the methods in the above-mentioned embodiments when executing computer instructions. For details, refer to the related descriptions in the foregoing method embodiments.

Optionally, the above-mentioned memory 601 may be independent or integrated with the processor 602 . When the memory 601 is set independently, the calling user terminal further includes a bus for connecting the memory 601 and the processor 602 .

The embodiment of the present application also provides a computer-readable storage medium, in which computer instructions are stored, and when the processor executes the computer instructions, each step in the method in the foregoing embodiments is implemented.

An embodiment of the present application further provides a computer program product, including computer instructions, and when the computer instructions are executed by a processor, each step in the method in the foregoing embodiments is implemented.

Other embodiments of the present application will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the application, these modifications, uses or adaptations follow the general principles of the application and include common knowledge or conventional technical means in the technical field not disclosed in the application . The specification and examples are to be considered exemplary only, with a true scope and spirit of the application indicated by the following claims.

It should be understood that the present application is not limited to the precise constructions which have been described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. A calling method of a weak signal coverage area is characterized in that the method is applied to a number authentication server, and the method comprises the following steps:

the number authentication server receives a first call request sent by a background server, performs number verification on a calling number in the first call request, and sends a verification result to the background server; the first call request is sent to the background server by a calling user terminal, the first call request is forwarded to an exchange server by the background server when the verification result is that the verification is successful, the first call request is converted into a second call request by the exchange server protocol, the second call request is sent to SBC equipment, the second call request is sent to a core network by the SBC equipment, and the core network establishes a session between the calling user terminal and a called user terminal according to the second call request.

2. The calling method according to claim 1, wherein the first call request is an IP call request based on a SIP protocol; the second call request is an IP call request based on signaling number seven.

3. The method according to claim 1 or 2, wherein the second call request is sent by the SBC device to the core network through an access network.

4. A calling method of a weak signal coverage area is characterized in that the method is applied to a called user terminal, and the method comprises the following steps:

when a first call instruction sent by a core network is received, a third call request is sent to a call forwarding server; the first call instruction is generated by the core network according to a fifth call request initiated by a calling subscriber terminal, the third call request is sent to an SBC device by the call forwarding server, the SBC device is used for sending the third call request to an exchange server, the third call request is converted into a fourth call request by a protocol of the exchange server and is sent to a background server, and the background server generates a second call instruction according to the fourth call request;

and receiving a second call instruction sent by the background server, and establishing a session between the calling user terminal and the called user terminal.

5. The calling method according to claim 4, wherein the sending the third call request to a call forwarding server when receiving the first call instruction sent by the core network specifically comprises:

receiving a first call instruction sent by the core network;

responding to the first call instruction, and receiving a call forwarding operation;

responding to the call forwarding operation, and generating the third call request according to a calling number and a called number;

and sending the third call request to the call forwarding server.

6. The calling method according to claim 4 or 5, wherein the third call request is sent by the call forwarding server to the SBC device through the access network.

7. A paging device for a weak signal coverage area, comprising:

the acquisition module is used for receiving a first call request sent by a background server;

the processing module is used for carrying out number verification on the calling number in the first call request;

the processing module is also used for sending a verification result to the background server;

the first call request is sent to the background server by a calling user terminal, the first call request is forwarded to an exchange server by the background server when the verification result is that the verification is successful, the first call request is converted into a second call request by the exchange server protocol, the second call request is sent to SBC equipment, the second call request is sent to a core network by the SBC equipment, and the core network establishes a session between the calling user terminal and a called user terminal according to the second call request.

8. A calling device, comprising: a memory and a processor;

the memory stores computer execution instructions;

the processor executes computer-executable instructions stored by the memory to implement the method of any of claims 1 to 6.

9. A computer-readable storage medium having computer-executable instructions stored thereon, which when executed by a processor, are configured to implement the method of any one of claims 1 to 6.

10. A computer program product, comprising a computer program which, when executed by a processor, implements the method of any one of claims 1 to 6.

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