CN101123647B - A communication method, system and service control function entity - Google Patents

Abstract

The present invention discloses a method for communication, which comprises the steps as follows: a calling terminal sends a call request to business control functional entity, and the call request contains a calling terminal identification and a called terminal identification; according to the calling terminal identification and the called terminal identification, the business control functional entity determines a terminal with ability of playing media stream and obtain the address of media stream subscribed by the terminal; the terminal with ability of playing media stream according to the address of the media stream obtains and plays the media stream subscribed by the terminal. The application efficiency of the terminal is improved through the present invention, and the user experiences well. The present invention also discloses a communication system and a business control functional entity.

Description

A communication method, system and service control functional entity

technical field

The present invention relates to the communication field, in particular to a communication method, system and service control functional entity.

Background technique

Session Initiation Protocol (Session Initiation Protocol, SIP) is an important protocol in the next generation network (NextGeneration Net, NGN), and it is getting more and more attention from the communication industry. The purpose of developing SIP is to solve the signaling control in the Internet Protocol (Internet Protocol, IP) network, communicate with the soft switch, and provide advanced telephone services across the Internet (Internet).

There are a large number of Public Switched Telephone Network (PSTN) users in the telecommunications network. With the development of telecommunications, more and more users use SIP video phones. Between PSTN terminals and SIP video phone terminals, or Before the call connection between the SIP videophone terminal and the SIP videophone terminal, the screen of the SIP videophone terminal is in an idle state; The screen is still in an idle state, and the functions of the videophone terminal are not fully utilized during these idle times, which makes the user experience poor.

Contents of the invention

Embodiments of the present invention provide a communication method, system, and service control functional entity to solve the problem in the prior art that when a terminal capable of playing media streams is not used for a video call, the screen is in an idle state, resulting in poor user experience The problem.

A method of communication, the method comprising:

The calling terminal initiates a call request to the service control functional entity, and the call request includes the identification of the calling terminal and the identification of the called terminal;

The service control function entity connects the call request to the called terminal, and establishes a call connection between the calling terminal and the called terminal;

The service control function entity determines a terminal capable of playing media streams according to the calling terminal identifier and called terminal identifier, and obtains the address of the media stream subscribed by the terminal capable of playing media streams;

The terminal capable of playing media streams acquires and plays the media streams subscribed by the terminal according to the addresses of the media streams.

A communication system, the system includes a calling terminal, a called terminal and a service control function entity, wherein,

The calling terminal is configured to initiate a call request to the service control functional entity, the call request includes the identification of the calling terminal and the identification of the called terminal, and if the calling terminal has the ability to play media streams, then according to the The address of the media stream obtained by the service control functional entity plays the media stream subscribed by the calling terminal;

The service control function entity is used to connect the call request to the called terminal, establish a call connection between the calling terminal and the called terminal, and Determine a terminal capable of playing media streams, and obtain the address of the media stream subscribed to by the terminal capable of playing media streams;

The called terminal is configured to play the media stream subscribed by the called terminal according to the address of the media stream obtained by the service control function entity if the called terminal has the capability of playing media streams.

A service control functional entity, the service control functional entity includes:

The receiving module is used to receive the call request sent by the calling terminal, and the call request includes the identification of the calling terminal and the identification of the called terminal;

A module for connecting the call request to the called terminal and establishing a call connection between the calling terminal and the called terminal;

A terminal capability determination module, configured to determine whether the terminal corresponding to the calling terminal identifier and the called terminal identifier has the ability to play media streams;

An acquisition module, configured to acquire the address of the media stream subscribed by the terminal when the terminals corresponding to the calling terminal ID and the called terminal ID have the capability of playing media streams.

In the embodiment of the present invention, when a terminal capable of playing media streams is off-hook and in a state of not having a video call, the terminal plays pre-subscribed media stream data, which improves the application efficiency of the terminal and makes user experience better.

Description of drawings

FIG. 1(a) and FIG. 1(b) are schematic structural diagrams of a communication system in Embodiment 1 of the present invention;

FIG. 2 is a schematic flowchart of the steps of the communication process in Embodiment 2 of the present invention;

FIG. 3 is a schematic diagram of a signaling flow of a communication process in Embodiment 3 of the present invention;

FIG. 4 is a schematic diagram of a signaling flow of a communication process in Embodiment 4 of the present invention;

FIG. 5 is a schematic diagram of a signaling flow of a communication process in Embodiment 5 of the present invention;

FIG. 6 is a schematic diagram of a signaling flow of a communication process in Embodiment 6 of the present invention;

FIG. 7 is a schematic diagram of a signaling flow for implementing a multimedia color TV service after a call is established between a calling terminal and a called terminal in Embodiment 7 of the present invention;

FIG. 8 is a schematic diagram of a signaling flow of a communication process in Embodiment 8 of the present invention;

FIG. 9 is a schematic diagram of a signaling flow of a communication process in Embodiment 9 of the present invention;

FIG. 10 is a schematic diagram of a signaling flow of a communication process in Embodiment 10 of the present invention;

FIG. 11 is a schematic diagram of a signaling flow of a communication process in Embodiment 11 of the present invention;

FIG. 12(a) and FIG. 12(b) are schematic diagrams of the signaling flow of the communication process when both the calling terminal and the called terminal are converged terminals in Embodiment 12 of the present invention;

FIG. 13 is a schematic diagram of a structure of a service control function entity in Embodiment 13 of the present invention.

Detailed ways

In order to achieve the purpose of the present invention, in the embodiment of the present invention, when the video call is not in progress, a terminal capable of playing media streams is used to play preset media stream data.

The so-called terminals capable of playing media streams include, but are not limited to: SIP videophone terminals, H.323 videophone terminals and fusion terminals. The concept of a converged terminal is: a terminal that integrates an ordinary PSTN phone and a video phone (SIP video phone). Its physical entity is one, and its internal logic is divided into a PSTN phone and a video phone. Symmetrical Digital Subscriber Line (Asymmetric Digital Subscriber Line, ADSL) interface and network port.

The present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1(a) and Figure 1(b), it is a communication system in Embodiment 1 of the present invention, the system includes a calling terminal 11, a called terminal 12 and a service control function entity 13, wherein the calling terminal 11 It is used to initiate a call request to the service control functional entity 13, the call request includes the identification of the calling terminal and/or the identification of the called terminal, and if the calling terminal 11 itself has the ability to play media streams, then play the service control function entity 13. The media stream corresponding to the address of the media stream subscribed by the calling terminal 11 acquired by the functional entity 13; the service control functional entity 13 is used to determine the media stream that has the media stream to play according to the calling terminal identifier and/or called terminal identifier in the call request. capable terminal, and acquire the address of the media stream subscribed by the terminal; the called terminal 12 is used to play the address corresponding to the address of the media stream subscribed by the service control function entity 13 if it has the ability to play the media stream. media stream.

In the communication system described in the embodiment of the present invention, in addition to the call connection, the multimedia color TV service can also be realized when the video call is not in progress (before the call connection is established or a non-video connection is performed).

In addition, the system also includes an application server 14, which is used to query the address of the media stream subscribed by the terminal capable of playing media stream determined by the service control function entity 13, and return the address to the service control function entity 13.

In order to facilitate users to use this system, in this embodiment, it is also necessary to count the time of playing media streams of the calling and called terminals with the ability to play media streams, including but not limited to the following two situations:

1. As shown in Figure 1(a), the system also includes a timer 15, which is used to start the timer when the terminal with the ability to play the media stream starts to play the media stream, and stops timing when the media stream is stopped. device, and finally count the playing time.

2. As shown in Figure 1(b), the terminal having the ability to play media streams is used to send the playback status to the service control functional entity 13 when starting or stopping playing the media stream; the service control functional entity 13 is used to The playing state is forwarded to the application server 14; the application server 14 is used to count the playing duration according to the start playing event and the stop playing event.

In addition, the timer 15 and the application server 14 can also be combined to perform the operation of counting the playing time.

Both the system in the embodiment of the present invention and the method described later can be applied to the SIP protocol or the H.323 protocol.

The method of the present invention will be described in detail below in conjunction with specific examples.

One or both of the calling terminal or the called terminal has the capability of playing media stream data. As shown in FIG. 2, it is a schematic flow chart of the steps of the communication method in Embodiment 2 of the present invention. It can be seen from the figure that this embodiment mainly includes the following steps:

Step 201: The calling terminal initiates a call request through the service control function entity, and the call request includes the calling terminal identifier and/or the called terminal identifier.

When the call starts, the calling terminal first initiates a call request, and the call request may include other information required for a normal call in addition to the calling terminal ID and/or the called terminal ID.

Service control functional entities include but are not limited to: SIP server (SIP Server), H.323 server (H.323 Server).

Step 202: The service control function entity judges whether the calling terminal and the called terminal have the ability to play media streams according to the identifiers of the calling terminal and the called terminal. If yes, perform step 203. If not, proceed to normal call connection.

In this embodiment, an ordinary PSTN telephone terminal only performs normal calls and does not have the ability to play media stream data. Therefore, the service control function entity can send a message from the Home Subscriber Server (HSS) according to the received terminal identifier. ) to determine which one or both of the calling terminal and the called terminal have the ability to play media stream data.

Step 203: The service control functional entity acquires the media stream address subscribed by the calling terminal and/or the called terminal that has the capability of playing media stream data from the Application Server (AS).

The media stream address includes but not limited to: a uniform resource locator (Universal Resource Locator, URL) of media stream data.

AS includes but not limited to: policy server.

Step 204: The service control function entity returns the acquired media stream address to the calling terminal and/or the called terminal.

If the calling terminal has the ability to play media streams, the desired media streams can be pre-ordered, or the telecommunications operator can order media stream data for the terminal, then establish the corresponding relationship between the calling terminal ID and the media stream address. When the service control function entity determines that the calling terminal has the ability to play media streams according to the attributes of the calling terminal, it queries the corresponding media stream address from the AS and returns it to the calling terminal. The process of judging the capability of the called terminal and returning the media stream address is similar.

Step 205: The calling terminal and/or the called terminal capable of playing the media stream plays the media stream corresponding to the media stream address.

After receiving the media stream, the calling terminal and/or the called terminal capable of playing the media stream connects to the media stream server according to the address, and plays the media stream obtained from the media stream server.

In the communication method described in the embodiment of the present invention, in addition to the call connection, the multimedia color TV service can also be realized when the video call is not in progress (before the call connection is established or a non-video connection is performed).

Embodiment 2 of the present invention also includes the step of the service control functional entity connecting the call request to the called terminal, and this step can be applied between step 201 and step 202, or between step 203 and step 205.

Before the call is connected, when the SIP videophone terminal is used to play audio and video data, there are many situations depending on the types of the calling and called terminals, and the different situations will be described below.

As shown in Figure 3, it is a schematic diagram of the signaling process for realizing the multimedia color TV service in the communication process in the third embodiment of the present invention. In the third embodiment, the service control function entity is set as SIP Server, and the calling terminal is SIP The videophone terminal, the media stream address is URL, and the third embodiment mainly includes the following steps:

Step 301: The calling terminal goes off-hook, and reports the off-hook event to the SIP Server.

Set the calling terminal and the SIP Server to subscribe to the terminal status reporting event. When the calling terminal goes off-hook, the calling terminal user status will be reported to the SIP Server, and the off-hook event will be reported to the SIP Server. In this embodiment, the reported terminal user status can be regarded as a call request, and the reported information includes the calling terminal identifier and the calling terminal status information.

Step 302: The SIP Server obtains the URL address of the media stream corresponding to the calling terminal from the policy server.

In this embodiment, since the calling terminal is a SIP videophone terminal, when the calling terminal goes off-hook, the SIP Server will query the URL address of the media stream to be played for the calling terminal, so that the calling terminal will Play media stream during video call.

The policy server obtains the URL address of the media stream that the calling terminal needs to play according to a preset method, including but not limited to:

The calling terminal pre-subscribes the media stream (video clip or video advertisement information, etc.), and establishes the corresponding relationship between the calling terminal ID and the media stream URL, and the SIP Server sends the calling terminal ID to the policy server, and the policy server The corresponding relationship between the calling terminal identifier and the media stream URL is found to find out the URL and return it to the SIP Server.

Step 303: The SIP Server sends the received URL to the calling terminal, and the calling terminal plays the media stream corresponding to the URL.

The calling terminal obtains the media stream corresponding to the URL from the streaming media server according to the URL, and plays the media stream to the user.

In the third embodiment, as long as the terminal status reporting event is subscribed between the terminal and the SIP Server, the set audio and video data can be played to the user through the terminal as long as the terminal is off-hook and no video call is in progress.

As shown in Figure 4, it is a schematic diagram of the signaling flow in the communication process in Embodiment 4 of the present invention. In Embodiment 4, the calling terminal is set to be a PSTN terminal, and the called terminal is a SIP videophone terminal. When the calling terminal is listening to the ring back tone and the called terminal is ringing, the called terminal plays the media stream data. This process includes:

Step 401: The calling terminal initiates a call request through the SIP Server.

The calling terminal sends a call request to the SIP Server, and the call request includes the identification of the calling terminal and the identification of the called terminal.

In this embodiment, a SIP message is taken as an example to illustrate the realization of the color TV service, therefore, the call request may be an invitation message (SIP INVITE).

Step 402: The SIP Server determines that the called terminal has the ability to play media streams.

The SIP Server determines that the calling terminal is a PSTN terminal and the called terminal is a SIP videophone terminal according to the calling terminal ID and called terminal ID in the received call request.

Step 403: The SIP Server acquires the media stream address corresponding to the called terminal from the policy server.

The policy server finds out the address of the subscribed media stream according to the identifier of the called terminal, and returns it to the SIPServer.

Step 404: The SIP Server sends the call request to the called terminal, and connects the call.

After receiving the returned media stream address, the SIP Server connects the call between the calling terminal and the called terminal: sends a call request to the called terminal, and receives the SIP 180 response returned by the called terminal.

At this time, the calling terminal hears the ring back tone, and the called terminal starts ringing.

Step 405: The SIP Server sends the media stream address to the called terminal, and the called terminal plays the corresponding media stream according to the media stream address.

Similar to Embodiment 4, when the calling terminal is a SIP videophone terminal and the called terminal is a PSTN terminal, the calling terminal can also be used to play a preset media stream, as shown in FIG. 5 , which is an embodiment of the present invention. The signaling flow diagram of the communication process in Example 5 is different from that in Embodiment 4 in that: the SIP Server determines that the calling terminal has the ability to play media streams, and sends the media stream address obtained from the policy server to the calling terminal, The calling terminal acquires and plays the media stream from the stream media server according to the address of the media stream.

When both the calling terminal and the called terminal have the ability to play media streams (for example, both are SIP videophone terminals), the communication process can be implemented according to the signaling flow diagram shown in Figure 6 corresponding to Embodiment 6 of the present invention . The SIP Server determines that both the calling terminal and the called terminal are SIP videophone terminals, and then queries the addresses of the media streams corresponding to the two terminals from the policy server. After the calling terminal hears the ringback tone, After the terminal rings, it obtains and plays the media stream from the streaming media server according to the address of the media stream respectively.

Embodiments three, four, five, and six are the process of realizing the color TV service when there is no call between the calling terminal and the called terminal; The process of realizing the color TV service after the call between the terminals is established.

As shown in Fig. 7, it is the process of implementing the color TV service after establishing a call between the calling terminal and the called terminal in Embodiment 7 of the present invention. In this embodiment, the calling terminal is set as a PSTN terminal, and the called terminal is set The calling terminal is a SIP videophone terminal, including:

Step 701: The calling terminal sends a call request to the SIP Server, and the SIP Server connects the call request to the called terminal, and establishes a call connection between the calling terminal and the called terminal.

The call request includes the calling terminal identifier and the called terminal identifier. After receiving the call request, the SIP Server connects the call to the called terminal according to the called terminal identifier: the SIP Server sends the SIP INVITE to the called terminal, and receives The SIP 180 response message returned by the called terminal, at this time, the calling terminal hears the ringback tone, and the called terminal rings. When the called terminal goes off-hook, it sends a SIP 200 response message to the SIP Server, and the SIP Server returns the response message (SIP ACK) to the called terminal, and the calling and called terminals start talking.

Step 702: The SIP Server acquires the address of the media stream corresponding to the called terminal from the policy server.

The SIP Server determines that the called terminal is a SIP videophone terminal according to the called terminal identifier, and then the policy server queries the address of the media stream customized for the called terminal.

Step 703: After receiving the media stream address, the called terminal plays the media stream corresponding to the media stream address.

Embodiment 8 is an example where the calling terminal is a SIP videophone and the called terminal is a PSTN terminal. The basic process is similar to that of Embodiment 7. The difference is that after the connection between the calling terminal and the called terminal is established, the SIP Server Query the address of the media stream subscribed to the calling terminal from the policy server, and the calling terminal obtains and plays the corresponding media stream from the streaming server according to the address of the media stream, as shown in FIG. 8 .

In Embodiment 9, both the calling terminal and the called terminal are set to be SIP videophone terminals. This embodiment can be regarded as a combination of Embodiment 7 and Embodiment 8. As shown in FIG. After the call connection is established, the SIP Server obtains the addresses of the media streams customized for the calling terminal and the called terminal respectively from the policy server, and the calling terminal and the called terminal respectively obtain and play them from the streaming media server according to the addresses of the media streams. media stream.

In the embodiment of the present invention, the duration of playing the media stream by the calling and called terminals can be counted, and the duration information can be returned to the user. The method of counting the duration is not limited to: start the timer when the terminal starts playing the media stream, stop the timer when it stops playing the media stream, and obtain the playback duration according to the timer; subscribe the terminal between the terminal capable of playing the media stream and the SIP Server Status report event, when the terminal starts or stops playing the media stream, it can send the playback status to the SIP Server through SIP and other messages, and the SIP Server passes the playback status to the AS, and the AS counts the playback time according to the start playback event and stop playback event.

In Embodiment 3 to Embodiment 9, both the calling terminal and the called terminal belong to the same SIP Server, and in the embodiments of the present invention, the calling terminal and the called terminal may also belong to different SIP Servers respectively. As shown in FIG. 10 , which is a schematic diagram of the signaling flow in Embodiment 10 of the present invention, the calling terminal and the called terminal belong to different SIP Servers respectively. In the dotted line frame of 1001 mark among the figure, represent the process that the called terminal plays the media stream when ringing; In the figure 1002 mark, represent the process of the calling terminal playing the media stream when listening to the ringback tone; 1003 in the figure The marked dotted box indicates the process of playing media streams when the calling terminal and the called terminal make a non-video call. In Figure 10 of this embodiment, the application server returns the address of the media stream subscribed by the called terminal to the SIP Server that provides services for the called terminal, or the address may be forwarded by the SIP Server that provides services for the calling terminal.

The realization of the color TV service in Embodiment 3 to Embodiment 6 is when no call connection is established between the calling and called terminals, and the realization of the color TV service in Embodiment 7 to Embodiment 10 is to establish an After the video call is connected, in the embodiment of the present invention, it includes but is not limited to: combining the process before and after the call connection establishment to realize the color TV service. As shown in FIG. 11 , it is a schematic diagram of the signaling flow of Embodiment 11 of the present invention. In this embodiment, both the calling terminal and the called terminal are SIP videophone terminals, and the service control functional entity is a home domain server node (S- CSCF), before the call is connected, play the subscribed media stream respectively, after the non-video call, the calling terminal and the called terminal still play the subscribed media stream. This step includes:

Step 1101: The calling terminal initiates a call request through the S-CSCF, and the call request may include identifications of the calling terminal and the called terminal.

After the calling terminal goes off-hook, the call request can be initiated. The call request can be an INVITE message, which is sent to the S-CSCF through the proxy node (P-CSCF), and the S-CSCF determines that the calling and called terminals have the ability to play media streams. capability, the call request is forwarded to the application server.

Step 1102: The S-CSCF obtains the media stream addresses respectively corresponding to the calling terminal and the called terminal from the application server.

The application server queries the address of the subscribed media stream according to the identification of the calling terminal and the called terminal, and returns the address to the S-CSCF through the INVITE.

Step 1103: the S-CSCF sends the call request to the called terminal, and connects the call.

The S-CSCF that provides services for the calling terminal forwards the call request to the called terminal through the S-CSCF that provides services for the called terminal. After the called side returns a 180 response message, the calling terminal is in the state of listening to the ringback tone, and The caller is in the ringing state.

Step 1104: The S-CSCF sends the media stream address to the calling terminal and the called terminal side, and the calling terminal and the called terminal obtain and play the media stream corresponding to the address.

The S-CSCF that provides services for the calling terminal sends the media stream address obtained from the application server to the calling terminal and the called terminal respectively through the P-CSCF and the S-CSCF that provides services for the called terminal. The terminal acquires the corresponding media stream from the stream media server according to the address, and plays it to the user.

In this embodiment, the application server may also send the address to the calling terminal and the called terminal.

Step 1105: The called terminal picks up the phone, and the call connection is established.

In this step, the application server can query the address of the media stream subscribed by the calling terminal and the called terminal again according to the identifiers of the calling terminal and the called terminal (the calling terminal and the called terminal can subscribe to different media streams at different times).

Step 1106: the application server sends the address to the calling terminal and the called terminal, and the calling terminal and the called terminal obtain and play the corresponding media stream according to the address.

If in step 1105, the application server does not query the media stream address again, then in this step, the media stream is played according to the address obtained in step 1104.

In Embodiment 2 to Embodiment 11, all use the SIP protocol as the protocol for data transmission, and the terminal with the ability to play media streams is a SIP videophone terminal. In Embodiment 12 of the present invention, it is set to have the ability to play The terminal fusion terminal with media streaming capabilities, the calling terminal and the called terminal are both fusion terminals, the communication process is shown in Figure 12(a) and Figure 12(b), and Figure 12(a) shows the calling terminal and called terminal Realize the color TV business process when no call connection is established between them, including:

Step 1201: The PSTN terminal in the calling terminal initiates a call request to the PSTN terminal in the called terminal through the SIP Server, and the call request includes the identification of the calling terminal and the identification of the called terminal.

The PSTN in the calling terminal initiates a request to the PSTN in the called terminal in a normal manner.

The PSTN terminal in the calling terminal sends the call request to SIP Server A that provides services for the calling terminal through an initial address message (IAM), and SIP Server A forwards the call request to the SIP server that provides services for the called terminal through an INVITE message. ServerB, SIP ServerB sends the call request to the PSTN terminal of the called terminal through the IAM again. The PSTN terminal among the called terminals returns the reply response message to the PSTN terminal through the original path.

Step 1202: The SIP Server determines that the calling and called terminals have the ability to play media streams and inquires from the policy server the addresses of the media streams customized by the calling and called terminals.

The SIP Server obtains the address of the media stream from the policy server and can carry the required information (such as the called terminal identifier, the calling terminal identifier, and call information, etc.) through the information (INFO) message.

Step 1203: The policy server returns the queried media stream addresses to the SIP Servers that provide services for the main terminal and the terminal respectively.

In this embodiment, the 200 response message may carry the returned media stream address.

Step 1204: The SIP Server returns the media stream address to the SIP terminal in the calling terminal and the called terminal respectively.

Set the media stream address corresponding to the calling terminal as URL A1, and the media stream address corresponding to the called terminal as URL B1, then the SIP Server uses the INFO message to return URL A1 to the SIP terminal in the calling terminal, and returns URL B1 to the SIP terminal in the calling terminal. SIP terminal in the called terminal.

Step 1205: The calling terminal and the called terminal respectively receive the acquisition of the media stream address and play the media stream.

The master terminal and the slave terminal return a 200 response message to the SIP Server that provides services for itself.

Through steps 1201 to 1205, the color TV service before the call is established between the calling terminal and the called terminal is realized. As shown in Figure 12(b), the color TV service after the call is established between the calling terminal and the called terminal includes:

Step 1206: A normal call connection is established between the calling terminal and the called terminal.

The called terminal picks up the hook, and sends the information to the SIP Server that provides the server for the called terminal through an answer message (ANM), and the SIP Server forwards the information to the SIP Server that provides the server for the calling terminal through a 200 message. Send this information to the PSTN terminal of the calling terminal through the ANM message, and return the ACK message to the SIP Server that provides services for the called terminal.

Steps 1207 to 1210 are similar to the aforementioned steps 1202 to 1205 .

Step 1211: The SIP terminal of the calling terminal forwards the INFO message carrying the playback duration to the policy server through the SIP Server that provides services for itself.

The process of the called terminal returning the playback duration is similar, and the SIP terminal of the called terminal also forwards the INFO message carrying the playback duration to the policy server through the SIP Server that provides services for itself.

The policy server returns a 200 response message via the same path.

According to the solutions of Embodiment 2 to Embodiment 12, it can be seen that one or both of the calling terminal and the called terminal must have the ability to play media streams, and there is no limitation on the type of the terminal itself, which can be a SIP terminal, H. 323 terminals or integrated terminals or separated terminals, therefore, the communication process may be communication between different types of terminals, and is not limited to the situation described in the foregoing embodiments.

When the SIP server requests the policy server to query the address of the media stream, the information can be sent by messages such as INFO and MESSAGE; the policy server returns the address of the obtained media stream to the SIP server by messages such as 200, INFO and MESSAGE.

According to the description of the above system and method, Embodiment 13 of the present invention also provides a service control functional entity. As shown in FIG. 13 , the service control functional entity includes a receiving module 21, a terminal capability determining module 22 and an acquiring module 23, Wherein, the receiving module 21 is used to receive the call request sent by the terminal, and the call request includes the terminal identification; the terminal capability determining module 22 is used to determine whether the terminal corresponding to the terminal identification has the ability to play media streams; the obtaining module 23 is used to When the terminal identified by the terminal is capable of playing media streams, the address of the media stream subscribed by the terminal is acquired.

The service control function entity also includes a sending module 24, configured to return the address of the media stream to the terminal capable of playing the media stream. In this embodiment, the sending module 24 may carry the media stream address in the INFO message and send it to the terminal.

In the system, method, and service control functional entity described in the embodiments of the present invention, signaling transmission needs to be realized between the calling terminal and the called terminal and the SIP Server. If it is in the SIP protocol, the SIP message is used as the carrier to transmit the required If the information is in the H.323 protocol, the required information is transmitted with the H.323 message as the carrier. Taking the SIP protocol as an example, SIP messages generally support TEL URI/SIP URI, and because in this embodiment, the SIP message needs to carry the RTSP URI or HTTP URL of the media stream in the media stream server, it is therefore necessary to expand the uniform resource identifier in the SIP message (URI) address, so that SIP messages also support RTSPURI or HTTP URL. The interface information is shown in Table 1:

Table 1

Among them, the INFO message is the message format to be transmitted, and the cmd command word indicates the action to be executed, such as: cmd is 4001, which means that when the calling terminal and the called terminal are not making a video call, the terminal with the ability to play the media stream plays the subscribed media stream .

<linkuri> indicates the address of the media stream. The address type can be HTTP URL or RTSPURL. When the address type is HTTP URL, the terminal links to the corresponding website; when the address type is RTSP URL, the terminal links to the corresponding streaming media server.

<cont> indicates additional description of the linkuri link.

<event> indicates the status event of the terminal starting, stopping, and pausing the media stream.

<autolink> indicates the terminal connection method, which can be manual or automatic. For example: when autolink is 2, it means that the terminal automatically connects to the streaming media server after receiving the message, and the terminal does not need any operation.

Similarly, signaling transmission needs to be realized between the SIP Server and the application server. If it is in the SIP protocol, the required information is transmitted using the SIP message as the carrier. If it is in the H.323 protocol, the H.323 message is used as the carrier to transmit the required information. Information. Taking the SIP protocol as an example, the SIP message generally supports TEL URI/SIP URI, and because in this embodiment, the SIP message needs to carry the RTSP URI or the HTTP URL of the media stream in the media stream server, it is therefore necessary to expand the URI address in the SIP message, Enable SIP messages to also support RTSP URI or HTTP URL. The interface information is shown in Table 2:

Table 2

Table 1 and Table 2 are the interface information of the INFO message, as shown in Table 3, it is the interface information of the 200 message.

table 3

Among them, cmd, linkuri, cont, event, and autolink Tag parameters have the same meaning as softswitch and terminal interface.

<callee> indicates the ID of the called terminal, <caller> indicates the ID of the calling terminal; <callinfo> indicates information during a normal call.

Through the method, system and service control functional entity of the present invention, when the calling terminal and the called terminal are not in a video call, the pre-subscribed media stream data is played, so that the user can obtain more information at the same time, and the experience is better.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (11)

1. A communication method, characterized in that the method comprises: The calling terminal initiates a call request to the service control functional entity, and the call request includes the identification of the calling terminal and the identification of the called terminal; The service control function entity connects the call request to the called terminal, and establishes a call connection between the calling terminal and the called terminal; The service control function entity determines a terminal capable of playing media streams according to the calling terminal identifier and called terminal identifier, and obtains the address of the media stream subscribed by the terminal capable of playing media streams; The terminal capable of playing media streams acquires and plays the media streams subscribed by the terminal according to the addresses of the media streams. 2. The method according to claim 1, wherein the service control function entity obtains the address of the media stream subscribed by the terminal capable of playing the media stream from the application server. 3. The method of claim 1, further comprising: Start the timer when the terminal capable of playing the media stream starts to play the media stream, stop the timer when the media stream stops playing, and obtain the playing duration according to the timer; or When the terminal capable of playing the media stream starts or stops playing the media stream, the playback status is sent to the application server through the service control function entity, and the application server counts the playback duration according to the start playback event and the stop playback event. 4. A communication system, characterized in that the system includes a calling terminal, a called terminal and a service control functional entity, wherein, The calling terminal is configured to initiate a call request to the service control functional entity, the call request includes the identification of the calling terminal and the identification of the called terminal, and if the calling terminal has the ability to play media streams, then according to the The address of the media stream obtained by the service control functional entity plays the media stream subscribed by the calling terminal; The service control function entity is used to connect the call request to the called terminal, establish a call connection between the calling terminal and the called terminal, and Determine a terminal capable of playing media streams, and obtain the address of the media stream subscribed to by the terminal capable of playing media streams; The called terminal is configured to play the media stream subscribed by the called terminal according to the address of the media stream obtained by the service control function entity if the called terminal has the capability of playing media streams. 5. The system of claim 4, further comprising: The application server is configured to query the address of the media stream subscribed by the terminal capable of playing media stream determined by the service control functional entity, and return the address to the service control functional entity. 6. The system according to claim 4, wherein the system applies a session initiation protocol or an H.323 protocol. 7. The system of claim 5, wherein: The terminal having the capability of playing the media stream is used to send the playback status to the application server through the service control functional entity when starting or stopping the playback of the media stream, and the application server counts the playback duration according to the start playback event and the stop playback event; Or, the system further includes a timer, which is used to start the timer when the terminal capable of playing the media stream starts to play the media stream, stop the timer when the media stream stops playing, and count the playing time. 8 . The system according to claim 4 , wherein the terminals capable of playing media streams include: Session Initiation Protocol videophone terminals, H.323 videophone terminals or fusion terminals. 9. A service control functional entity, characterized in that the service control functional entity includes: The receiving module is used to receive the call request sent by the calling terminal, and the call request includes the identification of the calling terminal and the identification of the called terminal; A module for connecting the call request to the called terminal and establishing a call connection between the calling terminal and the called terminal; A terminal capability determination module, configured to determine whether the terminal corresponding to the calling terminal identifier and the called terminal identifier has the ability to play media streams; An acquisition module, configured to acquire the address of the media stream subscribed by the terminal when the terminals corresponding to the calling terminal ID and the called terminal ID have the capability of playing media streams. 10. The service control functional entity according to claim 9, wherein the service control functional entity further comprises: A sending module, configured to return the address of the media stream to the terminal capable of playing the media stream. 11. The service control function entity according to claim 10, wherein the sending module is configured to send the information INFO message carrying the media stream address to the terminal.

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