CN100563219C - System and method for implementing click-to-dial - Google Patents

Abstract

The invention discloses a kind of system and method for click to dial, described system comprises: the calling and called equipment that connects by internet and telephone network, PC terminal, presence server that links to each other successively by the internet and the application server with third party call controlled function.Described method comprises: instant message client the user transfer immediate news to presence server, comprises the calling and called number information in this instant message; Send the calling and called number information to application server by presence server; Set up session between the caller and called users by application server controls.Utilize the present invention, the simple session protocol client computer that can use any one that instant message is presented professional expansion realizes the function of click to dial, the carrying out of convenient for users to use and this business.

Description

System and method for implementing click-to-dial

technical field

The invention relates to the technical fields of computer, network communication and telephone, in particular to a system and method for realizing click-to-dial.

Background technique

3PCC (Third-Party Call Control) means that a third-party controller establishes a session between the other two, and the controller is responsible for the media negotiation between the two parties in the session. 3PCC is a very flexible control method. In the PSTN (Public Switched Telephone Network) network, third-party call control is usually used for conferences and connection services (the operator creates a call that connects the other two parties). Similarly, using the SIP (Simple Session Protocol) protocol can also use 3PCC to complete many services, such as click-to-dial, playback during a call, etc., and it is very convenient to implement. An offer/answer mode is defined in RFC3264, so that two entities can use the offer/answer (offer/answer) mode of SDP (Session Description Protocol) for session negotiation. 3PCC has a wide range of applications, for example, it can facilitate the control of signaling, and it is easy to implement CTD (click to dial), early media playback, and voice notification services during calls, and so on.

The click-to-dial service is the most typical application instance of 3PCC, and a third party establishes a call between two other parties through the Internet. When the user browses the website, he can directly click on the link address on the webpage, and use HTTP (hypertext transfer protocol) to start the third-party call control between the customer service representative and the SIP user by the controller. The controller can then use the method described above to establish a media session between the two.

In the prior art, click-to-dial is usually based on a thin/thick (thin/fat) client computer, which is implemented by connecting the calling phone and the called phone with the help of a Web server. As shown in Figure 1:

The terminal user logs in to the website by dialing, and realizes the call between user A and user B by means of a link provided by the Web (web page).

It can be seen that, in order to realize the click-to-dial service, the user must log in to a dedicated server (the server is equivalent to a dedicated client terminal) that provides the service before establishing a connection with the 3PCC. This implementation method is inconvenient for business development, and at the same time brings inconvenience to users, and requires relatively high system costs.

Contents of the invention

Another object of the present invention is to provide a system for realizing click-to-dial, so as to overcome the disadvantages in the prior art that click-to-dial must be realized through the 3PCC interface of a dedicated server, improve the versatility of the system, and reduce the system cost.

The purpose of the present invention is to provide a method for realizing click-to-dial, to overcome the shortcoming that click-to-dial must be realized through the 3PCC special interface in the prior art, and to realize click-to-dial on all presentation servers or access servers conveniently through the client Function.

For this reason, the present invention provides following technical scheme:

A system for realizing click-to-dial, comprising: a calling device and a called device connected through the Internet and a telephone network, the calling device and the called device are computers or ordinary telephones or mobile phones connected to the telephone number network through a gateway device, the The system also includes: a PC terminal sequentially connected through the Internet, a presentation server and an application server with a third-party call control function, wherein,

The PC terminal is used for the calling user to send an instant message to the presence server, and the instant message includes calling and called number information;

The presence server is used to transmit the calling and called number information in the instant message to the application server;

The application server is used to establish a session between the calling device and the called device according to the calling and called number information.

The PC terminal is embedded with an instant message client, so that the calling user or a third-party user can interact with the presence server through the instant message client.

Message interaction is performed between the presence server and the application server through a SIP protocol interface.

A method for implementing click-to-dial, said method comprising the steps of:

A. The user of the instant message client sends an instant message to the presence server, and the instant message contains the calling and called number information;

B. The presence server transmits the calling and called number information to an application server with a third-party call control function;

C. The application server controls the establishment of a session between the calling user and the called user.

The presence server transmits the calling and called number information to the application server through a REFER message of the SIP protocol.

Preferably, the method further comprises:

The click-to-dial service user registration is performed on the presence server in advance.

Preferably, the method further comprises:

After receiving the instant message, the presence server authenticates the instant message client user according to the user registration information.

Preferably, the method further comprises:

When the presence server authenticates the instant message client user, it performs password authentication on the user.

Preferably, the instant message client user is a calling user or a third-party user.

As can be seen from the technical solution provided by the present invention above, the present invention sends a SIP (Initiation Session Protocol) message in a specific format through the terminal user, sends the calling and called numbers to the presence server, and then the presence server passes the extended SIP The message transmits the calling number and the called number to the 3PCC function body in the application server, so that the 3PCC controls the establishment of a session between the calling party and the called party. The present invention transfers the function of transmitting calling and called numbers from the client to the presence server, so any SIMPLE (SIP extension of instant message presentation service) client can be used to realize the click-to-dial function, which facilitates the user's use and conduct of the business. The invention has the advantages of simple realization, strong system versatility and low cost.

Description of drawings

FIG. 1 is a schematic diagram of a network structure for realizing click-to-dial in the prior art;

Fig. 2 is a functional block diagram of the system of the present invention;

Fig. 3 is the flow that SIP agreement realizes 3PCC;

Fig. 4 is the message flow that the system of the present invention realizes click-to-dial;

Fig. 5 is an implementation flow chart of the method of the present invention.

Detailed ways

The core of the present invention is to enable the user to establish a connection with an application server with a third-party call control function by means of a presence server, and transmit the calling and called numbers to the application server, and then the 3PCC (third-party call control) functional entity thereon Control the session negotiation between the calling user and the called user. Therefore, the system of the present invention can be implemented based on a traditional presence server and a PC terminal embedded with an instant message client. The PC terminal user interacts with the presence server through instant messages, and the presence server interacts with the 3PCC through the SIP protocol.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

With reference to Fig. 2, Fig. 2 is the functional block diagram of system of the present invention:

The calling device S1 and the called device S2 are connected through the Internet and the telephone network, wherein the calling device and the called device can be computers, or ordinary telephones or mobile phones connected to the telephone number network through a gateway device.

The PC terminal S3, the presence server S4 and the application server S5 with the third-party call control function are sequentially connected through the Internet. The PC terminal S3 interacts with the presence server S4 through a short message, and the message interaction between the presence server S4 and the application server S5 is performed through a SIP protocol interface.

Those skilled in the art know that instant messaging is a technology close to real-time communication, which can greatly improve people's work efficiency. Moreover, the instant messaging service is easy to use.

In order to realize the message interaction between the PC terminal and the presence server, an instant message client S31 can be installed on the PC terminal, for example, Microsoft's MSN Messenger Service client, or Tencent QQ. After installing an instant messaging client, users can log in to the presence server through the client and communicate with other instant messaging clients.

When the PC terminal user needs to control the establishment of a connection between two other users, he sends an instant message to the presence server S4, adds the calling and called user number information to the instant message, and sends it to the presence server S4. After the presence server receives the instant message, it extracts the calling and called user number information therein, and then sends the calling and called user numbers to the application server S5 through the REFER (redirect to other address) message of the SIP (Initial Session Protocol) protocol . The application server S5 controls the establishment of the session connection between the calling user and the called user through its third-party call controller.

For example, a PC terminal user sends an instant message "Connect 9845012345to 5217152". After receiving the message, the presence server parses out the calling number as "9845012345" and the called number as "5217152". Then, the presence server sends the parsed calling and called numbers to the 3PCC of the application server through a SIP message.

Those skilled in the art know that SIP is an application layer control protocol for multimedia communication on an IP network, and can be used to initiate, establish and release sessions. The flexible and simple features of the SIP protocol and its flexible and powerful call control functions have attracted more and more manufacturers and operators. The SIP protocol can also be used in conjunction with the SDP (Session Description Protocol) protocol to negotiate the media attributes of the session, so it is easier to implement third-party call control. SIP users are identified by a URL (Uniform Resource Locator) similar to an e-mail address, for example: sip:myname@mycompany.com. In this way, a unified name can be used to identify different terminals and communication methods for network services and Provides full flexibility for users to use.

SIP messages are used to establish and modify session connections. They are divided into two types: request and response. There are six basic types of request messages, including: INVITE (initiate a call), ACK (response to the response), BYE (delete the connection), CANCLE (cancel in the middle), OPTIONS (query the ability of the other party), REGISTER (registration), the makers of the SIP protocol are still defining new types according to needs. Response messages have various encodings that indicate the specific response made by the recipient of the session.

A SIP message consists of three parts:

The start line, located at the very beginning of the message, contains basic content such as the type of the message and the protocol version.

The message header, which describes the attributes of the message, is similar to the syntax and semantics of the HTTP (Hypertext Transfer Protocol) message header. The format is: In a message, the header can have multiple lines.

Message body, the message body is mainly a description of the session to be established by the message. A typical message body is in SDP (Session Description Protocol) format, which is used to describe the session to be established, for example, the message body for establishing a multimedia session includes descriptions of information such as audio, video coding, and sampling frequency. The type of the message body is identified by the code defined by MIME (Multipurpose Internet Mail Extensions), for example, the type of the SDP is identified as application/SDP. In addition to SDP, the message body can also be other types of text or binary data.

In order to increase the SIP message function, the SIP message type can be expanded, for example, the REFER message is used to implement the function of call transfer. A SIP message contains a series of message headers to describe the message, and there are currently 35 standard headers. Similarly, new headers can be added as needed to support new features, new headers can be defined in conjunction with new types, and content in original types can also be supplemented. For example, the above-mentioned REFFER type message newly added to support call transfer.

In the present invention, the calling and called number information can be sent to 3PCC through the extended REFER message.

For example, you can set the REFER message format as follows:

REFER sip:a@example.com SIP/2.0

Via:SIP/2.0/UDP example.com; branch＝z9hG4bK2494930422

To:<sip:a@example.com>

From:<sip:a@presense.example.com>; tag＝193432243

Call-ID: 1234@example.com

CSeq: 1 REFER

Max-Forwards: 70

Refer-To:<sip:b@example.com>

Contact: <sip:a@presense.example.com>

According to the mechanism of the SIP protocol, 3PCC can be realized through the process shown in Figure 3:

The offer and answer in this flow chart are both SDP (Session Description Protocol) messages.

The controller first sends an INVITE (invitation) without SDP to user A, A's phone rings, and after A answers, the generated 200OK response will contain an offerl, carrying the media type, media format, and The transport protocol and the port and IP address for receiving the media stream. The controller includes the offer1 from A in the INVITE sent to B, and B generates answer1 to the offer1 after ringing the answer. Finally, the ACK sent by the controller to user A contains answer1 as a response.

The advantage of this process is that it is very simple, does not require the controller to generate an SDP, and does not need to consider the controller's own requirements for media types. For example, B is a media server, a conference server, and so on.

Fig. 4 has shown the message flow that the system of the present invention realizes click-to-dial:

1. The presence service user sends an instant message to the presence service server, and the instant message contains the number information of user A and user B to be connected;

2. The presence server sends a 200OK response message to the presence service user;

3. The presence server sends a REFER message to 3PCC, which contains the number information of user A and user B to be connected;

4.3 The PCC sends a 200OK response message to the presence server;

5.3 The PCC sends a NOTIFY message to the presence server;

6. After receiving NOFITY, the presence server sends a 200OK response message to 3PCC;

7.3 PCC routes this call through SIP standard CTD (click-to-dial) method, the specific method can refer to the flow shown in Figure 3 to Figure 6 above;

8.3 The PCC sends a NOTIFY message to the presence server to notify the call result;

9. After receiving NOFITY, the presence server sends a 200OK response message to 3PCC;

10. The presence server notifies the presence service user of the call result through a short message;

11. The presence service user sends a 200 OK response message to the presence server.

So far, a complete dial-up process is over.

With reference to Fig. 5, Fig. 5 is the realization process of the method of the present invention, comprises the following steps:

Step 501: The user of the instant message client sends an instant message to the presence server, and the instant message contains calling and called number information. The format of the instant message can be preset so that both parties can recognize it.

In order to ensure the interests of the operator, users who use this service can register the click-to-dial service on the presence server in advance. In this way, only registered users can use this function, and it is also possible to effectively realize the dial-up service according to the user's registration information. The authentication of the user to ensure the security of the network. If the user needs to be authenticated, after the presence server receives the instant message, it will authenticate the instant message client user according to the user's registration information, and can also require the user to input his own password information, so that the system can authenticate the user. Password validation.

Step 502: The presence server transmits the calling and called number information to the application server with the third-party call control function.

The presence server transmits the calling and called number information to the application server through a REFER message of the SIP protocol.

Step 503: The application server controls the establishment of a session between the calling user and the called user.

At this point, the application server can use its 3PCC to establish a session between the two users through the CTD method of the SIP standard.

In the above process of implementing click-to-dial, the instant message client user may be a calling user or a third-party user.

While the invention has been described by way of example, those skilled in the art will appreciate that there are many variations and changes to the invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and changes without departing from the spirit of the invention.

Claims (9)

1. A system for realizing click-to-dial, comprising: a calling device and a called device connected through the Internet and a telephone network, the calling device and the called device are computers or ordinary telephones or mobile phones connected to the telephone number network through a gateway device, It is characterized in that the system also includes: a PC terminal connected in sequence through the Internet, a presentation server and an application server with a third-party call control function, wherein, The PC terminal is used for the calling user to send an instant message to the presence server, and the instant message includes calling and called number information; The presence server is used to transmit the calling and called number information in the instant message to the application server; The application server is used to establish a session between the calling device and the called device according to the calling and called number information. 2. The system according to claim 1, wherein the PC terminal is embedded with an instant message client, so that the calling user or a third-party user can exchange messages with the presence server through the instant message client. 3. The system according to claim 1, wherein the presence server and the application server perform message interaction through a SIP protocol interface. 4. A method for realizing click-to-dial, characterized in that the method comprises the steps of: A. The user of the instant message client sends an instant message to the presence server, and the instant message contains the calling and called number information; B. The presence server transmits the calling and called number information to an application server with a third-party call control function; C. The application server controls the establishment of a session between the calling user and the called user. 5. The method according to claim 4, wherein the presence server transmits the calling and called number information to the application server through a REFER message of the SIP protocol. 6. The method according to claim 4, further comprising: The click-to-dial service user registration is performed on the presence server in advance. 7. The method according to claim 6, further comprising: After receiving the instant message, the presence server authenticates the instant message client user according to the user registration information. 8. The method according to claim 7, further comprising: When the presence server authenticates the instant message client user, it performs password authentication on the user. 9. The method according to claim 4, wherein the instant message client user is a calling user or a third party user.

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