WO2009033401A1 - A communication method, system and service controlling function entity - Google Patents

Abstract

A communication method includes: calling terminal originates a call request to service controlling function entity, and the call request includes the calling terminal's identifier and/or the called terminal's identifier; the service controlling function entity determines the terminal capable of playing media stream according to the calling terminal's identifier and/or the called terminal's identifier, and obtains the address of the media stream which the terminal has subscribed; the terminal capable of playing media stream obtains and plays the subscribed media stream according to the media stream address. A communication system and service controlling function entity are also provided.

Description

 Communication method, system and service control function entity

 This application claims priority to Chinese Patent Application No. 200710153905.2, entitled "Communication Method, System and Service Control Function Entity", filed on September 13, 2007, the entire contents of which are incorporated by reference. In this application.

Technical field

 The present invention relates to the field of communications, and in particular, to a communication method, system, and service control function entity. Background technique

 The Session Initiation Protocol (SIP) is an important protocol in the Next Generation Net (NGN) and is receiving more and more attention from the communications industry. The SIP protocol is used to solve signaling control in the Internet Protocol (IP) network and communicate with softswitches to provide advanced telephony services across the Internet.

 There are a large number of Public Switched Telephone Network (PSTN) users in the telecommunication network. With the development of telecommunication, 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; if the non-video call is performed after the call connection is successful, the SIP videophone terminal The screen is still idle.

Summary of the invention

 The embodiment of the present invention provides a communication method, a system, and a service control function entity, to solve the problem that the screen is in an idle state when the terminal having the capability of playing the media stream does not perform a video call exists in the prior art.

 A communication method, the method comprising:

 Receiving a call request from the calling terminal, determining, according to the calling terminal identifier and/or the called terminal identifier in the call request, a terminal having a capability of playing the media stream, and acquiring an address of the media stream subscribed by the terminal; The address of the stream is sent to the terminal having the capability to play the media stream.

 A communication system, the system comprising 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 function entity, where the call request includes a calling terminal identifier and/or a called terminal identifier, and if the capability of playing the media stream is performed, according to the calling request The address of the media stream obtained by the service control function entity plays the subscribed media stream;

 The service control function entity is configured to determine, by the calling terminal identifier and/or the called terminal identifier in the call request, a terminal that has the capability of playing the media stream, and obtain an address of the media stream subscribed by the terminal; Sending an address of the media stream to the terminal having the capability of playing the media stream;

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

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

 a receiving module, configured to receive a call request sent by the terminal, where the call request includes a terminal identifier, and a terminal capability determining module, configured to determine whether the terminal corresponding to the terminal identifier has the capability of playing a media stream;

 An acquiring module, configured to acquire an address of a media stream subscribed by the terminal when the terminal corresponding to the terminal identifier has the capability of playing the media stream;

 And a sending module, configured to return an address of the media stream to the terminal having the capability of playing a media stream.

 In the embodiment of the present invention, when the terminal having the capability of playing the media stream is in the state of not performing the video call, the terminal plays the pre-subscribed media stream data, which improves the application rate of the terminal, and the user experience is better.

DRAWINGS

 1(a) and 1(b) are schematic diagrams showing the structure of a communication system according to Embodiment 1 of the present invention; FIG. 2 is a schematic flowchart showing the steps of a communication process according to Embodiment 2 of the present invention;

 3 is a schematic diagram of a signaling process of a communication process according to Embodiment 3 of the present invention;

 4 is a schematic diagram of a signaling process of a communication process according to Embodiment 4 of the present invention;

 5 is a schematic diagram of a signaling process of a communication process according to Embodiment 5 of the present invention;

 6 is a schematic diagram of a signaling process of a communication process according to Embodiment 6 of the present invention;

 7 is a schematic diagram of a signaling flow of implementing a multimedia color vision service after a call is established between a calling terminal and a called terminal according to Embodiment 7 of the present invention;

 8 is a schematic diagram of a signaling process of a communication process according to Embodiment 8 of the present invention;

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

10 is a schematic diagram of a signaling process of a communication process in Embodiment 10 of the present invention; 11 is a schematic flowchart of signaling process of a communication process according to Embodiment 11 of the present invention;

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

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

detailed description

 In carrying out the creation process of the present invention, the inventor found that the screen of the SIP videophone terminal is before the call connection between the PSTN terminal and the SIP videophone terminal, or between the SIP videophone terminal and the SIP videophone terminal. Is in an idle state; if a non-video call is made after the call connection is successful, the screen of the SIP videophone terminal is still idle, and the functions of the videophone terminal are not fully applied during these idle periods. The user feels poor.

 In the embodiment of the present invention, when the video call is not performed, the preset media stream data is played by using the terminal having the media stream playing capability.

 Terminals having the ability to play media streams include, but are not limited to, SIP videophone terminals, H.323 videophone terminals, and converged terminals. The concept of the converged terminal is: a terminal in which a common PSTN telephone and a videophone (SIP videophone) are combined, the physical entity is one, and the internal logic is divided into a PSTN telephone and a video telephone, and the internal can be set non- Asymmetric Digital Subscriber Line (ADSL) interface and network port.

 The invention will be described in detail below with reference to the accompanying drawings.

 As shown in FIG. 1(a) and FIG. 1(b), the communication system in the first embodiment of the present invention includes a calling terminal 11, a called terminal 12, and a service control function entity 13, wherein the calling terminal 11 For initiating a call request to the service control function entity 13, the call request includes a calling terminal identifier and/or a called terminal identifier, and if the calling terminal 11 has the capability of playing a media stream, playing the service control The media stream corresponding to the address of the media stream subscribed by the calling terminal 11 is obtained by the function entity 13; the service control function entity 13 is configured to determine that the media stream is played according to the calling terminal identifier and/or the called terminal identifier in the call request. The terminal of the capability, and obtains the address of the media stream subscribed by the terminal; the called terminal 12 is configured to play the media stream address of the self-subscription obtained by the service control function entity 13 if it has the capability of playing the media stream. Media stream.

In addition to the call connection, the communication system described in the embodiment of the present invention can implement the multimedia color picture service when the video call is not performed (before the call connection is established or the non-video connection is performed). In addition, the system further includes an application server 14 configured to query, by the service control function entity 13, an address of a media stream subscribed by the terminal that plays the media stream capability, and return the address to the service control function entity. 13.

 In order to facilitate the user to use the system, in this embodiment, the time for playing the media stream by the calling and called terminals having the capability of playing the media stream is also required, including but not limited to the following two situations:

 1. As shown in FIG. 1(a), the system further includes a timer 15 for starting a timer when the terminal having the capability of playing a media stream starts playing a media stream, and stopping timing when stopping the playing of the media stream. , the final statistics play time.

 2. As shown in FIG. 1(b), the terminal having the capability of playing a media stream is configured to send a play status to the service control function entity 13 when the media stream is started or stopped; the service control function entity 13 is used. The play status is forwarded to the application server 14; the application server 14 is configured to count the play duration according to the start play event and the stop play event.

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

 In the system of the embodiment of the present invention and the method described in the following, both can be applied to the SIP protocol or

H.323 protocol, etc.

 The method of the present invention is described in detail below in conjunction with specific embodiments.

 One or both of the calling or called terminals have the ability to play media stream data. As shown in FIG. 2, it is a schematic flowchart of the steps of the communication method in the second embodiment of the present invention. As can be seen from the figure, the embodiment mainly includes the following steps:

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

 At the beginning of the call, the calling terminal first initiates a call request. In addition to the calling terminal identifier and/or the called terminal identifier, the call request may also contain other information required for normal calling.

 The service control function entities include but are not limited to: SIP server (SIP Server), H.323 server (H.323 Server).

Step 202: The service control function entity determines whether the master and the called terminal have the capability of playing the media stream according to the identity of the master and the called terminal. If yes, step 203 is performed, and if not, the normal call connection is performed. In this embodiment, the normal PSTN telephone terminal only performs normal calls and does not have the capability of playing media stream data. Therefore, the service control function entity can obtain the home subscriber server (Home Subscriber Server, HSS according to the received terminal identifier. It is determined which one or both of the primary and the called terminal have the ability to play media stream data.

 Step 203: The service control function entity acquires, from an application server (AS), a media stream address that is subscribed by the calling terminal and/or the called terminal that has the capability of playing the media stream data.

 The media stream address includes but is not limited to: a Uniform Resource Locator (URL) of the media stream data.

 AS includes but is not limited to: Policy Server.

 Step 204: The service control function entity returns the obtained media stream address to the calling terminal and

/ or called terminal.

 If the calling terminal has the capability of playing the media stream, the media stream that is desired to be played may be pre-ordered, or the telecommunication operator subscribes the media stream data to the terminal, and the corresponding relationship between the calling terminal identifier and the media stream address is established. When the service control function entity determines that the calling terminal has the capability of playing the media stream according to the attribute of the calling terminal, the corresponding media stream address is queried from the AS and returned to the calling terminal. The process of determining the capabilities of the called terminal and returning to the media stream address is similar.

 Step 205: The calling terminal and/or the called terminal having the capability of playing the media stream play the media stream corresponding to the media stream address.

 After receiving the media stream address, the calling terminal and/or the called terminal having the capability of playing media stream are connected to the media stream server according to the address, and play the media stream obtained from the media stream server.

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

 The second embodiment of the present invention further includes the step of the service control function entity connecting the call request to the called terminal. The step may be applied between step 201 and step 202, or may be applied between step 203 and step 205.

 Before the call is connected, when the audio and video data are played by the SIP videophone terminal, there are various cases depending on the type of the called terminal. The following describes each case separately.

As shown in FIG. 3, it is a schematic diagram of a signaling process for implementing a multimedia color vision service in a communication process according to Embodiment 3 of the present invention. In the third embodiment, a service control function entity is a SIP Server, and the calling party is configured. The terminal is a SIP videophone terminal, and the media stream address is a URL. The third embodiment mainly includes the following steps:

 Step 301: The calling terminal picks up the phone and reports the off-hook event to the SIP server.

 The caller terminal and the SIP server are configured to subscribe to the terminal status report event. When the calling terminal is off-hook, the status of the calling terminal is reported to the SIP server, and the off-hook event is reported to the SIP server. In this embodiment, the reported end user status can be regarded as a call request, and the reported information includes the calling terminal identifier and the status information of the calling terminal.

 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 picks up the phone,

The SIP Server queries the calling terminal for the URL address of the media stream that needs to be played, so that the calling terminal plays the media stream when no video call is made.

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

 The calling terminal subscribes in advance to the media stream (video clip or video advertisement information, etc.), and establishes a correspondence between the calling terminal identifier and the media stream URL, and the SIP server sends the calling terminal identifier to the policy server, and the policy server is established according to the The corresponding relationship between the calling terminal identifier and the media stream URL finds the URL and returns 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 acquires 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 and the SIP server subscribe to the terminal status report event, the set audio and video data can be played to the user through the terminal as long as the terminal goes off-hook and the video call is not performed.

As shown in FIG. 4, it is a schematic diagram of a signaling flow in a communication process according to Embodiment 4 of the present invention. In the fourth embodiment, a calling terminal is a PSTN terminal, and a called terminal is a SIP videophone terminal. When the calling terminal listens 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, where the call request includes the calling terminal identifier and the called terminal identifier.

 In this embodiment, the SIP message is taken as an example to describe the implementation of the color video service. Therefore, the call request may be an invite message (SIP INVITE).

 Step 402: The SIP Server determines that the called terminal has the capability of playing the media stream.

 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 identifier and the called terminal identifier in the received call request.

 Step 403: The SIP server acquires a media stream address corresponding to the called terminal from the policy server. The policy server finds the address of the subscribed media stream according to the called terminal identifier, and returns it to the SIP.

Ssrvsr.

 Step 404: The SIP Server sends the call request to the called terminal to connect 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 the fourth embodiment, when the calling terminal is a SIP videophone terminal and the called terminal is a PSTN terminal, the calling terminal can also play the preset media stream, as shown in FIG. 5, which is implemented by the present invention. The signaling flow diagram of the communication process in the fifth embodiment is different from the fourth embodiment in that: the SIP server determines that the calling terminal has the capability of playing the media stream, and sends the media stream address obtained from the policy server to the calling terminal. The media stream is obtained and played by the calling terminal from the streaming server according to the media stream address.

When the calling terminal and the called terminal both have the capability of playing the media stream (for example, all of the SIP videophone terminals), the communication process can be implemented according to the signaling flow diagram shown in FIG. 6 corresponding to the sixth embodiment of the present invention. . The SIP server determines that both the calling terminal and the called terminal are SIP videophone terminals, and then query the address of the media stream corresponding to the two terminals from the policy server, and the calling terminal hears the ring back tone, and the called party After the terminal rings, the media stream is obtained and played from the streaming server according to the address of the media stream. In the third, fourth, fifth, and sixth embodiments, the process of implementing the color vision service when the call between the calling terminal and the called terminal is not in the call, and the subsequent embodiments in the seventh, eighth, and ninth are at the calling terminal and the called party. The process of implementing the color vision service after the call between the terminals is established.

 As shown in FIG. 7, in the seventh embodiment of the present invention, a process of implementing a color vision service after a call is established between a calling terminal and a called terminal, in this embodiment, setting the calling terminal as a PSTN terminal, The 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 to establish a call connection between the calling terminal and the called terminal.

 The call request includes a calling terminal identifier and a 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 The SIP 180 response message returned by the called terminal is received. At this time, the calling terminal hears the ring back tone, and the called terminal rings. When the called terminal picks up the phone, it sends a SIP 200 response message to the SIP Server. After the SIP Server returns the response message (SIP ACK) to the called terminal, the call between the primary and the called terminal starts.

 Step 702: The SIP server acquires an 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 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.

 In the eighth embodiment, the calling terminal is a SIP videophone and the called terminal is a PSTN terminal, which is similar to the basic process of the seventh embodiment. The difference is that after the calling terminal and the called terminal establish a connection, the SIP server The address of the media stream subscribed to the calling terminal is queried from the policy server, and the calling terminal obtains and plays the corresponding media stream from the streaming media server according to the address of the media stream, as shown in FIG. 8.

In the ninth embodiment, the calling terminal and the called terminal are both 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 by the calling terminal and the called terminal respectively from the policy server, and the calling terminal and the called terminal respectively obtain and play from the streaming media server according to the address of the media stream. Media stream. In the embodiment of the present invention, the duration of playing the media stream by the calling and called terminals may be counted, and the duration information is returned to the user. The method of counting the duration includes, but is not limited to, starting a timer when the terminal starts playing the media stream, stopping the timer when the media stream is stopped, and obtaining the playing duration according to the timer; and subscribing between the terminal having the capability of playing the media stream and the SIP Server The terminal status reports the event. When the terminal starts or stops playing the media stream, the broadcast status can be sent to the SIP server through a message such as SIP. The SIP server transmits the play status to the AS. The AS counts the play duration according to the start play event and the stop play event. .

 In the third embodiment to the ninth embodiment, the master and the called terminal belong to the same SIP server. In the embodiment of the present invention, the master and the called terminal may belong to different SIP servers. As shown in FIG. 10, it is a schematic diagram of a signaling process in the tenth embodiment of the present invention, where the calling terminal and the called terminal belong to different SIP servers. The dotted line box identified by 1001 in the figure indicates the process in which the called terminal plays the media stream when ringing; the dotted line box identified by 1002 in the figure indicates the process in which the calling terminal plays the media stream while listening to the ring back tone; The dashed box of the logo indicates the process of playing the media stream when the calling terminal and the called terminal perform a non-video call. In FIG. 10 of the embodiment, the application server returns the address of the media stream subscribed by the called terminal to the SIP server serving the called terminal, and may also forward the address by the SIP server serving the calling terminal.

 The implementation of the color-vision service of the third embodiment to the sixth embodiment is implemented when the call connection is not established between the calling and the called terminals. The implementation of the color-vision service of the seventh embodiment to the tenth embodiment is to establish a non-connection between the calling and called terminals. After the video call is connected, in the embodiment of the present invention, including but not limited to: the process before the call connection is established and the process after the call connection is established to implement the color vision service. As shown in FIG. 11, FIG. 11 is a schematic diagram of a signaling flow according to Embodiment 11 of the present invention. In this embodiment, both the primary and the called terminals are SIP videophone terminals, and the service control function entity is a home domain server node (S- CSCF), before the call connection, respectively play the subscribed media stream, after the non-video call, the main and called terminals still play the subscribed media stream. This step includes:

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

The call request may be initiated after the calling terminal picks up the phone, and the call request may 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 playing media stream. Capabilities, then forward the call request to the application server. Step 1102: The S-CSCF obtains, from the application server, a media stream address corresponding to the primary and the called terminal respectively.

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

 Step 1103: The S-CSCF sends the call request to the called terminal to connect the call.

 The S-CSCF that provides the service to the calling terminal forwards the call request to the called terminal through the S-CSCF that provides the service to the called terminal. After the called side returns the 180 response message, the calling terminal is in the state of listening to the ring back tone. The user is called to be ringing.

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

 The S-CSCF serving the calling terminal sends the media stream address obtained from the application server to the calling terminal and the called terminal through the P-CSCF and the S-CSCF serving the called terminal respectively, the master and the called party. The terminal acquires the corresponding media stream from the streaming media server according to the address, and plays the content to the user.

 In this embodiment, the address may also be sent by the application server to the calling and called terminals. Step 1105: The called terminal picks up the phone, and the call connection is established.

 In this step, the application server can query the media stream addresses subscribed by the calling and called terminals again according to the identifiers of the calling and called terminals (the primary and the called terminals 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 primary and the called terminal obtain the corresponding media stream according to the address, and play the same.

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

 In the second embodiment to the eleventh embodiment, the SIP protocol is used as the data transmission protocol, and the terminal having the capability of playing the media stream is a SIP videophone terminal. In the twelfth embodiment of the present invention, the setting has a play. The terminal of the media stream capability is a converged terminal, and both the calling terminal and the called terminal are converged terminals, and the communication process is shown in FIG. 12(a) and FIG. 12(b), and FIG. 12(a) shows the calling terminal and the called party. The color vision service process is implemented when the call connection is not established between the terminals, including:

Step 1201: The PSTN terminal in the calling terminal initiates a call request to the PSTN terminal in the called terminal by using the SIP server, where the call request includes the calling terminal identifier and the called terminal identifier. The PSTN in the calling terminal initiates a request to the PSTN in the called terminal in the normal manner.

 The PSTN terminal in the calling terminal sends the call request to the SIP Server A that provides the service to the calling terminal through the initial address message (IMM), and the SIP Server A forwards the call request to the called terminal through the INVITE message. SIP Server B, SIP Server B sends the call request again through the IAM to the PSTN terminal of the called terminal. The PSTN terminal in the called terminal returns the response response message to the PSTN terminal in the calling terminal.

 Step 1202: The SIP Server determines that the calling and called terminals have the ability to play the media stream, and query the address of the media stream customized by the calling and called terminals from the policy server.

 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 the call information, etc.) through the information (INFO) message.

 Step 1203: The policy server returns the queried media stream address to the primary SIP server that is served by the terminal.

 In this embodiment, the returned media stream address may be carried by the 200 response message.

 Step 1204: The SIP server returns the media stream address to the SIP terminal in the calling and called terminals respectively. The media stream address corresponding to the calling terminal is set to URL A1, and the media stream address corresponding to the called terminal is URL B1, and the SIP server returns the URL A1 to the SIP terminal in the calling terminal by using the INFO message, and returns the URL B1. Give the SIP terminal in the called terminal.

 Step 1205: The primary and the called terminal respectively receive the media stream address to acquire and play the media stream. The primary and secondary terminals return a 200 response message to the SIP Server that provides services for itself.

 Through steps 1201 to 1205, the color picture service before the call is established between the primary and the called terminal is implemented. As shown in Figure 12 (b), the color vision service after the call is established between the primary and the called terminal, including:

 Step 1206: Establish a normal call connection between the calling terminal and the called terminal.

 The called terminal picks up the phone, and sends the information to the SIP server that provides the server for the called terminal through the response message (ANM), and the SIP server forwards the information to the SIP server of the server provided by the calling terminal through the 200 message, the SIP Server. The information is sent to the PSTN terminal of the calling terminal through the ANM message, and the ACK message is returned to the SIP Server serving the called terminal.

 Steps 1207 through 1210 are similar to steps 1202 through 1205 described above.

Step 1211: The SIP terminal of the calling terminal forwards the INFO message carrying the playing duration to the policy server through the SIP server serving the self. The process in which the called terminal returns the playing duration is similar. The SIP terminal of the called terminal also forwards the INFO message carrying the playing duration to the policy server through the SIP server that provides the service itself.

 The Policy Server returns a 200 response message over the same path.

 According to the solution of the second embodiment to the twelfth embodiment, one or two of the calling terminal and the called terminal are required to have the capability of playing the media stream, and the type of the terminal itself is not limited, and may be a SIP terminal, H. 323 terminal or converged terminal or separate terminal, therefore, the communication process may be communication between different types of terminals, and is not limited to the case described in the foregoing embodiment.

 When the SIP server requests the policy server to query the media stream address, the information can be sent through INFO, MESSAGE, etc.; the policy server returns the obtained media stream address to the SIP server through the 200, INFO, MESSAGE and other messages.

 According to the description of the foregoing system and method, the thirteenth embodiment of the present invention further provides a service control function entity. As shown in FIG. 13, the service control function entity includes a receiving module 21, a terminal capability determining module 22, and an obtaining module 23. The receiving module 21 is configured to receive a call request sent by the terminal, where the call request includes a terminal identifier, and the terminal capability determining module 22 is configured to determine whether the terminal corresponding to the terminal identifier has the capability of playing a media stream. When the terminal corresponding to the terminal identifier has the capability of playing the media stream, the address of the media stream subscribed by the terminal is obtained.

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

In the system, the method, and the service control function entity described in the embodiments of the present invention, signaling transmission between the primary and the called terminal and the SIP server is required, and in the SIP protocol, the SIP message is used as a carrier for transmission. Information, if in the H.323 protocol, transmits the required information using the H.323 message as the carrier. For example, the SIP message generally supports the TEL URI/SIP URI. In this embodiment, the SIP message needs to carry the RTSP (Real-Time Streaming Protocol) URL or HTTP (for the media stream in the media stream server). Hypertext Transfer Protocol, Hypertext Transfer Protocol) URL, so you need to extend the Uniform Resource Identifier (URI) address in SIP messages so that SIP messages also support RTSP URLs or HTTP URLs. The interface information is shown in Table 1: INFO sip: *889@10.75.35.161; user=phone SIP/2.0

 Via: SIP/2.0/UDP 10.70.106.82:5060;branch=z9hG4bK3883054875

 From: <sip:

075588881234@10.75.35.161;user=phone>;tag=1451640803

 To: <sip: 075589834250@10.75.35.161;user=phone>

 Call-ID: EC78236491@10.70.106.82

 CSeq: 29 INFO

 Max-Forwards: 5

 Subject: Client Request

 Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, REFER,

SUBSCRIBE, NOTIFY, INFO, INFO

 Content-Type: text/xml

 Content-Length: ..

<inf>

<cmd>xxxx</ cmd>

 <autolink>xxx</ autolink>

 </inf>

 Table 1

 The INFO message is the format of the transmitted message, and the cmd command word indicates the action to be performed. For example, the cmd is 4001, indicating that the terminal having the media stream capability plays the subscribed media stream when the calling terminal and the called terminal are in the process of making a video call. .

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

<cont> indicates the attached description of the linkuri link. <event> indicates a status event in which the terminal starts, stops, and pauses the playback of the media stream.

 <autolink> indicates the terminal connection method, either manually or automatically. For example, if autolink is 2, the terminal automatically connects to the streaming server after receiving the message, and the terminal does not need any operation.

 Similarly, the SIP server and the application server also need to implement signaling transmission. If the SIP protocol is used, the SIP message is used as the carrier to transmit the required information. If the H.323 protocol is used, the H.323 message is used as the carrier transmission. Information. For example, the SIP message generally supports the TEL URI/SIP URI. In this embodiment, the SIP message needs to carry the RTSP URL or the HTTP URL of the media stream in the media stream server, so the URI address in the SIP message needs to be extended. Make SIP messages also support RTSP

URL or HTTP URL. The interface information is shown in Table 2:

 INFO sip: 075589834250@10.75.35.161;user=phone SIP/2.0

 Via: SIP/2.0/UDP 10.70.106.82:5060;branch=z9hG4bK3883054875

 From: <sip:

075588881234@10.75.35.161;user=phone>;tag=1451640803

 To: <sip: 075589834250@10.75.35.161;user=phone>

 Call-ID: EC78236491@10.70.106.82

 CSeq: 29 INFO

 Max-Forwards: 5

 Subject: Client Request

 Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, REFER, SUBSCRIBE, NOTIFY, INFO, INFO

 Content-Type: text/xml

 Content-Length: ..

<inf>

 <cmd>xxxx</ cmd>

"^^linl ui^^* **************** "^^/l lril un^^"

<autolink>xxx</ autolink>

 ■^^callee^^* ****************** *"^^/callee^^

 ■^^callei*^^* ****************** *"^^/calle ^^

 </inf>

 Table 2

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

SIP/2.0 200 OK

 Via: SIP/2.0/UDP 10.70.106.82:5060;branch=z9hG4bK3883054875

From: <sip:

075588881234@10.75.35.161;user=phone>;tag=1451640803

 To: <sip: 075589834250@10.75.35.161;user=phone>;tag=1330799

Call-ID: EC78236491@10.70.106.82

 CSeq: 29 INFO

 Content-Type: text/xml

 Content-Length: ..

<inf>

 <cmd>xxxx</ cmd>

"^^linkuri^^"* **************** "^^/l lnkun^^"

 <autolink>xxx</ autolink>

 ■^^callee^^* ****************** *"^^/callee^^

 ■^^callei*^^* ******************* "^^/calle ^^"

 </inf>

 table 3

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

 <callee> indicates the called terminal identity, <caller> indicates the calling terminal identity; <callinfo> indicates normal call time information.

 The method, system and service control function entity of the present invention play pre-subscribed media stream data when the main and called terminals do not make a video call, so that the user can obtain more information at the same time, and the experience is better. The spirit and scope of the Ming. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

 A communication method, characterized in that the method comprises:

 Receiving a call request from the calling terminal, determining, according to the calling terminal identifier and/or the called terminal identifier in the call request, a terminal having a capability of playing the media stream, and acquiring an address of the media stream subscribed by the terminal; The address of the stream is sent to the terminal having the capability to play the media stream.

 The method according to claim 1, wherein the method further comprises: the terminal having the capability of playing the media stream acquiring and playing the subscribed media stream according to the address of the media stream.

 The method according to claim 1, wherein the step of acquiring an address of the media stream subscribed by the terminal comprises: obtaining, by the service control function entity, the media subscribed by the terminal having the capability of playing the media stream from the application server The address of the stream.

 4. The method according to claim 3, wherein the calling and called terminals belong to the same one of the service control function entities, or belong to different service control function entities.

 The method according to claim 4, wherein when the calling and called terminals respectively belong to different service control function entities, and the calling and called terminals have the capability of playing media streams,

 The sending the address of the media stream to the terminal having the capability of playing the media stream includes: the application server separately sending the address of the media stream subscribed by the calling and called terminals to the service control function entity to which the calling and called terminals belong Transmitting to the calling and called terminal by the service control function entity to which the calling and called terminals respectively belong;

 Or,

 The application server sends the address of the media stream subscribed by the calling terminal to the service control function entity to which the calling terminal belongs, and the address of the media stream subscribed by the calling terminal by the service control function entity to which the calling terminal belongs Sending to the calling terminal, sending the address of the media stream subscribed by the called terminal to the service control function entity to which the called terminal belongs, and the service control function entity to which the called terminal belongs to the address of the media stream subscribed by the called terminal Send to the called terminal.

 The method according to claim 1, wherein the method further comprises the step of: the service control function entity connecting the call request to the called terminal,

 The step is applied after the service control function entity acquires the address of the media stream; or the service control function entity determines before the terminal having the capability of playing the media stream.

7. The method according to claim 6, wherein if the called terminal picks up the call connection Before the establishment, the address of the media stream subscribed by the terminal is obtained, and the address of the media stream is sent to the terminal having the capability of playing the media stream.

 The address of the media stream subscribed by the terminal is obtained again, and the address of the media stream is sent to the terminal having the capability of playing the media stream.

 The method of claim 2, wherein the method further comprises:

 The timer is started when the terminal having the capability of playing the media stream starts playing the media stream, the timer is stopped when the media stream is stopped, and the playing time is obtained by the timer; or

 When the terminal having the capability of playing the media stream starts or stops playing the media stream, the playing state is sent to the application server through the service control function entity, and the application server counts the playing duration according to the start playing event and the stop playing event.

 9. The method of claim 1, wherein the method is applied to a Session Initiation Protocol SIP or H.323 protocol;

 When the session initiation protocol is applied, the SIP message supports the real-time streaming protocol RTSP URL or the hypertext transfer protocol HTTP URL by extending the uniform resource identifier URI address in the SIP message.

 A communication system, comprising: 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 function entity, where the call request includes a calling terminal identifier and/or a called terminal identifier, and if the capability of playing the media stream is performed, according to the service control The address of the media stream obtained by the functional entity plays the subscribed media stream;

 The service control function entity is configured to determine, by the calling terminal identifier and/or the called terminal identifier in the call request, a terminal that has the capability of playing the media stream, and obtain an address of the media stream subscribed by the terminal; Sending an address of the media stream to the terminal having the capability of playing the media stream;

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

 The system of claim 10, wherein the system further comprises: an application server, configured to query, by the service control function entity, an address of a media stream subscribed by the terminal having the capability of playing the media stream, And returning the address to the service control function entity.

12. The system of claim 10, wherein the system is applied to session initiation Protocol SIP or H.323 protocol.

 The system according to claim 11, wherein the system further comprises: a timer, configured to start a timer when the terminal having the capability of playing the media stream starts playing the media stream, and stop playing the media Stop timer when streaming, count the duration of playback; or

 The terminal having the capability of playing a media stream, configured to send a play status to the service control function entity when starting or stopping playing the media stream;

 The service control function entity is configured to forward the play status to the application server, and the application server is configured to count the play duration according to the start play event and the stop play event.

The system according to claim 10, wherein the terminal having the capability of playing the media stream comprises: a session initiation protocol videophone terminal, an H.323 videophone terminal or a converged terminal.

 A service control function entity, wherein the service control function entity comprises: a receiving module, configured to receive a call request sent by the terminal, where the call request includes a terminal identifier; and a terminal capability determining module, configured to determine the Whether the terminal corresponding to the terminal identifier has the capability of playing the media stream;

 And an obtaining module, configured to acquire an address of the media stream subscribed by the terminal when the terminal corresponding to the terminal identifier has the capability of playing the media stream.

 And a sending module, configured to return an address of the media stream to the terminal having the capability of playing a media stream.

 The service control function entity according to claim 15, wherein the sending module is configured to send an information INFO message carrying the media stream address to the terminal.

 The service control function entity according to claim 15, wherein the service control function entity comprises: a session initiation protocol SIP server or a home domain server node S-CSCF.