CN105282730B - Terminal communications status acquisition methods and system and application server in IMS network - Google Patents
Terminal communications status acquisition methods and system and application server in IMS network Download PDFInfo
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Abstract
The invention discloses terminal communications status acquisition methods in a kind of IMS network and system and application server, are related to IMS applied technical field.Terminal communications status obtains platform and sends the request of target terminal state subscription to mediaphone application server；Mediaphone application server obtains the Current Communications Status information that platform sends target terminal as terminal communications status information source, to terminal communications status；Target terminal state changes, mediaphone application server obtains platform to terminal communications status and sends target terminal communications status more new information, so that realizing terminal communications status platform obtains the continuous communications status change information of target terminal from mediaphone application server in real time.
Description
Technical field
It is logical that the present invention relates to terminals in IMS (IP multimedia subsystem) applied technical field more particularly to a kind of IMS network
Believe state acquiring method and system and application server.
Background technique
By opening service capability, network capabilities is packaged into various businesses control function by operator, with standard API
The form of (Application Programming Interface, application programming interfaces) is provided to service developer, to improve
The efficiency of business development.With the deployment and maturation of IMS network, the opening service capability of IMS network becomes operator and SP
(Service Provider, service provider)/CP (Content Provider, content supplier) focus of attention.
Terminal communications status, i.e. terminal busy-idle condition, are the basic capacity of IMS network and one kind has and is widely used
The network capabilities of application scenarios.Under usual state, people only just can know that oneself wishes connection when actually making a phone call
Object is in call or can to answer, if user needs multiple people of subsequenct call whithin a period of time, and these people
It is all busy now, then being time-consuming and invalid really for user.If user can be known in advance desired by oneself
The communications status of the object of connection, then can more efficiently be linked up.For example, obtaining the SOT state of termination with user's
Mobile phone or enterprise address book are combined, and address list will acquire the communications status information of All Contacts' terminal, to will use
The busy-idle condition of all mobile phone contacts or enterprise's office telephone is presented in address list in family mobile phone or enterprise address book, will be made
Mobile phone or enterprise address book are more intelligent.It can be convenient the suitable communication object of user's selection, save the time of user, mention
The communication efficiency of high user, while also saving network channel resource.It can be seen that the open of terminal communications status acquisition capability will
It is the important technical foundation of one kind of business innovation.
The inventors discovered that having in the state acquisition scheme in IMS, there are the following problems:
Presence (presentation) business in IMS is a kind of similar MSN (Microsoft's means of communication), QQ (chat work by Tencent
Tool) instant messaging service, there is also state acquisitions, i.e. its available good friend of Presence software client in the business
(being similarly Presence software client) issues the status information on presence server, but such status information is to use
Family is voluntarily manually set, such as " busy ", " leaving ", it is shown that user's oneself state and nonterminal communications status.These shapes
State information is issued and is stored on presence server, and presence server believes state as status information data source
Breath notice terminal.It is only to contain the soft client of Presence function, status information data that this method, which is applicable in terminal type,
It is not communications status that status information type included in source, which is only the state of user's self-setting, therefore the shape in Presence
The system and method for state acquisition of information can not be suitable for the acquisition of IMS terminal communications status.
Summary of the invention
The inventors found that above-mentioned exist in the prior art problem, and therefore at least one in described problem
A problem proposes a kind of new technical solution.
It is an object of the present invention to provide a kind of technical solutions obtained for terminal communications status in IMS network.
According to the first aspect of the invention, terminal communications status acquisition methods in a kind of IMS network are provided, comprising:
Mediaphone application server mediaphone application server receives the target terminal state from subscriber
Request is subscribed to, the request of target terminal state subscription includes subscriber address and the public subscriber identification for subscribing to terminal user；
Mediaphone application server sends target terminal state notification message, target terminal state notifying to subscriber
It include the Current Communications Status for subscribing to terminal user in message；
If subscribing to the state changes of terminal user, mediaphone application server sends target to subscriber
Terminal communications status more new information.
Optionally, mediaphone application server saves terminal communications status, as terminal communications status information source.
Optionally, mediaphone application server receives the request of target terminal state subscription, records subscriber address
With the public subscriber identification for subscribing to terminal user.
Optionally, (SUBSCRIBE) message is subscribed to by SIP and sends target terminal shape to mediaphone application server
State subscribes to request, wherein the parameter value of the event header field of SIP SUBSCRIBE message is set as communications status.
Optionally, the communications status for subscribing to terminal user is sent to subscriber by SIP notice (NOTIFY) message,
In, the parameter value of the event header field of SIP NOTIFY message is set as call-status communications status；
Optionally, the communications status for subscribing to terminal user is sent to subscriber by SIP NOTIFY message, wherein SIP
The parameter value of the Content-Type message body content type header field of NOTIFY message is set as application/call-status
Communications status.
Optionally, this method further include: S-CSCF receives SUBSCIRBE message, judges the Event of SUBSCIRBE message
Whether event header field is " call-status "；If it is, SUBSCIRBE message is directly forwarded to multimedia electricity by S-CSCF
Talk about application server.
According to another aspect of the present invention, a kind of application server is provided, comprising:
Request receiving module is subscribed to, for receiving the target terminal state subscription request from subscriber, target terminal shape
It includes subscriber address and the public subscriber identification for subscribing to terminal user that state, which subscribes to request,；
Notification message sending module, for sending target terminal state notification message to subscriber, target terminal state is logical
Know to include the Current Communications Status for subscribing to terminal user in message；
State updates sending module, if the state changes for subscribing to terminal user, sends mesh to subscriber
Mark terminal communications status more new information.
Optionally, which further includes information storage module；Information storage module is made for saving terminal communications status
For terminal communications status information source；And/or information storage module is subscribed to for receiving the request of target terminal state subscription, record
Person address and the public subscriber identification for subscribing to terminal user.
Optionally, the request of target terminal state subscription is SIP SUBSCRIBE message, wherein SIP SUBSCRIBE message
The parameter value of event header field be set as communications status.
Optionally, target terminal state notification message is SIP NOTIFY message, wherein the event of SIP NOTIFY message
The parameter value of header field is set as call-status communications status；
Alternatively, target terminal state notification message is SIP NOTIFY message, wherein SIP NOTIFY message
The parameter value of Content-Type message body content type header field is set as application/call-status communications status.
According to another aspect of the invention, terminal communications status in a kind of IMS network is provided and obtains system, including above-mentioned
Application server.
An advantage of the present invention is that by way of based on state subscription, target terminal state changes, more matchmakers
Body telco application server sends target terminal communications status more new information, so that it is real-time to realize terminal communications status platform
The continuous communications status change information of target terminal is obtained from mediaphone application server.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
The attached drawing for constituting part of specification describes the embodiment of the present invention, and together with the description for solving
Release the principle of the present invention.
The present invention can be more clearly understood according to following detailed description referring to attached drawing, in which:
Fig. 1 is the flow chart of one embodiment of terminal communications status acquisition methods in IMS network according to the present invention；
Fig. 2 is the structure chart of one embodiment that terminal communications status obtains system in IMS network according to the present invention；
Fig. 3 is the flow chart of another embodiment of terminal communications status acquisition methods in IMS network according to the present invention；
Fig. 4 is the structure chart of one embodiment of application according to the present invention server；
Fig. 5 is the structure chart of another embodiment of application according to the present invention server.
Specific embodiment
Carry out the various exemplary embodiments of detailed description of the present invention now with reference to attached drawing.It should also be noted that unless in addition having
Body explanation, the unlimited system of component and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally
The range of invention.
Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to the present invention
And its application or any restrictions used.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
Fig. 1 is the flow chart of one embodiment of terminal communications status acquisition methods in IMS network according to the present invention.
As shown in Figure 1, step 102, and MMTEL AS (Multimedia Telephony Application Server, it is more
Media phone application server) the target terminal state subscription request from subscriber is received, which asks
Seek including subscriber address and subscribe to the public subscriber identification (Public User Identity, PUID) of terminal user.One
In a embodiment, terminal communications status obtains platform as subscriber and sends the request of target terminal state subscription to MMTEL AS.
Step 104, MMTEL AS sends target terminal state notification message, target terminal state notification message to subscriber
In include subscribe to terminal user Current Communications Status.
Step 106, if subscribing to the state changes of terminal user, MMTEL AS sends target terminal to subscriber
Communications status more new information.
In IMS network, all types of terminals are initiated or received per call can all pass through MMTEL AS, MMTEL AS
The upper talking state for saving terminal, until end of calling.It is logical by terminal of the MMTEL AS in IMS network in above-described embodiment
Believe status information data source, realizes the acquisition and opening of terminal communications status in IMS network, and available target terminal
Continuous communications status change information.
In one embodiment, terminal communications status obtains platform based on SIP (the Session Initial after extension
Protocol, Session initiation Protocol) SUBSCRIBE (subscription) and NOTIFY (notice) method, in the situation that terminal is unaffected
Under, the continuous communications status change information of its target terminal is obtained from MMTEL AS.One for communications status information to SIP
The extension that SUBSCRIBE method and NOTIFY method are carried out includes:
To Event (event) header field in SUBSCRIBE and NOTIFY message, it is corresponding to extend terminal communications status event
Parameter value " call-status (communications status) ", when the parameter value of Event header field is set as call-status, indicates that this is ordered
The information read is terminal communications status；
To Content-Type (message body content type) header field in NOTIFY message, terminal communications status letter is extended
Corresponding parameter value " application/call-status " is ceased, indicates that the information of this notice is terminal communications status information；
To the body (message body) of NOTIFY message, the corresponding message body parameter of terminal communications status information is extended
Call-status and its corresponding parameter value " idle " (spare time) and " busy " (busy).Call- in NOTIFY message body
When status value is idle, indicate that user's communications status is to set the spare time；When the call-status value in NOTIFY message body is busy
When, indicate that user's communications status is busy to set.
Fig. 2 is the structure chart of one embodiment that terminal communications status obtains system in IMS network according to the present invention.Such as
Shown in Fig. 2, for the realization of cooperation business routing anchoring function, the major function of each network element node is as follows:
(1) terminal communications status obtains platform 21
Execute IMS terminal communications status information acquisition function, and by acquired status information be used for business development or
Third party CP/SP is given in opening.
(2)I-CSCF22
I-CSCF (Interrogating Call Session Control Function, agent call session control function
Can) provide terminal registration service and relevant routing function.
The sip message routing function of I-CSCF includes:
It current is provided according to what is obtained from HSS (Home Subscriber Server, home subscriber server) for user
The S-CSCF information of service will be forwarded to the S-CSCF to Client-initiated SIP request.
(3)HSS23
HSS need to save as the S-CSCF information of registration user service.When user receives SIP request, I-CSCF is by looking into
The S-CSCF information that HSS can be known as user service is ask, to forward the request to S-CSCF.
(4)S-CSCF24
S-CSCF (Serving Call Session Control Function, service call conversation control function) is mentioned
For functions such as the registration service of terminal, session control, relevant routing and business triggerings, and maintain session state information.
The sip message routing function of S-CSCF includes:
S-CSCF, directly should when receiving SUBSCIRBE message and Event header field therein is " call-status "
Message is forwarded to MMTEL AS.
(5)MMTEL AS25
All types of terminals are initiated in IMS or received per call can all pass through MMTEL AS, are protected on MMTEL AS
The talking state of terminal is deposited until end of calling.Therefore, MMTEL AS is obtained as terminal communications status information data source for state
Platform of making even provides user terminal communication status information.
When opening service capability gateway (or certain business platform, terminals for wishing to obtain terminal communications status) needs to obtain
Some/communications status of certain IMS terminals when, issue SUBSCRIBE message to the MMTEL AS where the user terminal, it is desirable that
Subscribe to the communications status event of terminal.In the SUBSCRIBE message:
The domain From and the domain To are the public subscriber identification (Public User Identity) for needing to subscribe to terminal user；
The value of Event header field is " call-status " of extension, indicates the communications status of terminal of pulling subscription；
Expires header field subscribes to the expired time with Subscribe, will need to retransmit before subscription is expired
Subscribe message keeps subscribing to, and indicates that cancelling communications status subscribes to when Expires header field is 0.
When the SUBSCRIBE state subscription that I-CSCF receives opening service capability gateway (or certain business platforms) sending is asked
When asking, according to the domain From/To in message, S-CSCF information where HSS knows the user is inquired, then SUBSCRIBE disappears
Breath is sent to the S-CSCF.
S-CSCF receives SUBSCRIBE message, indicates " call- according to the communications status event in Event header field
Status " forwards the messages to communications state data source MMTEL AS.
MMTEl AS subscribes to SUBSCRIBE message to communications status and returns to 202Accept response, and according to Event header field
In communications status event indicate " call-status ", return NOTIFY message, notify subscriber's (opening service capability gateway
Or business platform) user's communications status ordered by it.In the message:
The value of Subscription-State header field is active, indicates that the subscription has been in the state of going through；
The value of Content-Type header field is " application/call-status " of extension, indicates the information of notice
For terminal communications status information；
If user is busy now.Parameter " call-status " the assignment value extended in message body is " busy " (busy)；
If user does not set the spare time in call, the parameter " call-status " extended in message body is assigned a value of " idle " (spare time).
Fig. 3 is the flow chart of another embodiment of terminal communications status acquisition methods in IMS network according to the present invention.
As shown in figure 3, step 301, when terminal communications status obtains platform (e.g., opening service capability gateway or certain uncommon
Hope the business platform for obtaining terminal communications status) need to obtain some/communications status of certain IMS terminals when, issue
SUBSCRIBE message, to require to subscribe to the communications status event of terminal.In the message:
The domain From and the domain To are the public subscriber identification for needing to subscribe to terminal user；
The value of Event header field is " call-status " of extension, indicates the communications status of terminal of pulling subscription；
Expires header field subscribes to the expired time with Subscribe, will need to retransmit before subscription is expired
Subscribe message keeps subscribing to, and indicates that cancelling communications status subscribes to when Expires header field is 0.
The SUBSCRIBE message examples are as follows:
SUBSCRIBE sip:usera@domain.com SIP/2.0
Via:SIP/2.0/TCP192.0.2.41；Branch=z9hG4bK6d6a
Max-Forwards:70
From:<sip:usera@domain.com>；Tag=123456
To:<sip:usera@domain.com>
Call-ID:3573853342923422@192.0.2.44
CSeq:2131SUBSCRIBE
Event:call-status
Contact:sip:1234@192.0.2.44
Content-Length:0
Step 302, when I-CSCF receives the SUBSCRIBE shape of opening service capability gateway (or certain business platforms) sending
When state subscribes to request, according to the domain From/To in message, inquires HSS and know S-CSCF information where the user, then will
SUBSCRIBE message is sent to the S-CSCF；
Step 303, S-CSCF receives SUBSCRIBE message, is indicated according to the communications status event in Event header field
" call-status " forwards the messages to communications state data source MMTEL AS；
Step 304~306, MMTEl AS subscribes to SUBSCRIBE message to communications status and returns to 202Accept response；
Step 307~309, MMTEL AS indicates " call-status " according to the communications status event in Event header field,
NOTIFY message is returned, notifies that user's subscriber's (opening service capability gateway or business platform) ordered by it is conversing.
In the message:
The value of Subscription-State header field is active, indicates that the subscription has been in the state of going through；
The value of Content-Type header field is " application/call-status " of extension, indicates the information of notice
For terminal communications status information；
It is the parameter " call-status " of extension in message body, corresponding parameter value is " busy " (busy), indicates user
It is busy now.
The NOTIFY message example is as follows:
NOTIFY sip:1234@192.0.2.44SIP/2.0
Via:SIP/2.0/TCP192.0.2.41；Branch=z9hG4bK6d6a
From:<sip:usera@domain.com>；Tag=123456
To:<sip:usera@domain.com>
Call-ID:3573853342923422@192.0.2.44
CSeq:322NOTIFY
Event:call-status
Content-Type:application/callstatus
Call-status:busy
Step 310~312, terminal communications status obtain platform and return to 200OK message, indicate to have been received by ordered terminal
Communications status information；
Step 313~315, user's on-hook after call, MMTEl AS obtain platform to terminal communications status and return to NOTIFY
Message notifies that user's communications status ordered by it changes subscriber.In the message:
It is the parameter " call-status " of extension in message body, corresponding parameter value is " idle " (spare time), indicates user
End of conversation sets the spare time.
The NOTIFY message example is as follows:
NOTIFY sip:1234@192.0.2.44SIP/2.0
Via:SIP/2.0/TCP192.0.2.41；Branch=z9hG4bK6d6a
From:<sip:usera@domain.com>；Tag=123456
To:<sip:usera@domain.com>
Call-ID:3573853342923422@192.0.2.44
CSeq:323NOTIFY
Event:call-status
Content-Type:application/callstatus
Call-status:idle
Step 316~318, terminal communications status obtain platform and return to 200OK message, indicate to have been received by ordered terminal
The update of communications status information.
In one embodiment, S-CSCF is when receiving SUBSCIRBE message, if it is determined that Event header field is " call-
The message is then directly forwarded to the routing function of MMTEL AS by status ".Under normal circumstances, S-CSCF to MMTEL AS into
When row message forwards, need to carry out corresponding iFC (initial Filter Criteria, filter criteria when initial) to user
Signing.It is random for being acquired the user of communications status, if still using above method, it is necessary to carry out for all IMS users
Corresponding iFC (initial Filter Criteria, filter criteria when initial) signing, this workload is huge.Pass through
Above-mentioned scheme can be that all IMS users contract to avoid S-CSCF.
Fig. 4 is the structure chart of one embodiment of application according to the present invention server.As shown in figure 4, the application service
Device includes:
Request receiving module 41 is subscribed to, for receiving the target terminal state subscription request from subscriber, target terminal
State subscription request includes subscriber address and the public subscriber identification for subscribing to terminal user；
Notification message sending module 42, for sending target terminal state notification message, target terminal state to subscriber
It include the Current Communications Status for subscribing to terminal user in notification message；
State updates sending module 43, if the state changes for subscribing to terminal user, sends to subscriber
Target terminal communications status more new information.
Fig. 5 is the structure chart of another embodiment of application according to the present invention server.As shown in figure 5, the embodiment
In further include information storage module 54.
Information storage module 54 is for saving terminal communications status, as terminal communications status information source；And/or for connecing
The request of target terminal state subscription is received, the subscriber address and the public subscriber identification for subscribing to terminal user are recorded.
In one embodiment, the request of target terminal state subscription is SIP SUBSCRIBE message, wherein SIP
The parameter value of the event header field of SUBSCRIBE message is set as communications status.Target terminal state notification message is SIP NOTIFY
Message, wherein the parameter value of the event header field of SIP NOTIFY message is set as call-status communications status；Alternatively, target is whole
End state notification message is SIP NOTIFY message, wherein the Content-Type message body content kind of SIP NOTIFY message
The parameter value of class header field is set as application/call-status communications status.
In the prior art, it needs operator to build proprietary signaling monitoring system and saves terminal communications status, other business systems
If system will need to know user's communications status, it is necessary to active inquiry is carried out to the system with MAP protocol, if to obtain end
The continuity variation for holding communications status just must constantly initiate new MAP inquiry.
The technical solution of the disclosure has the advantages that following one or more: (1) not needing specially to build new system, and
It is that network element directly into network is subscribed to；(2) state acquisition is carried out by the way of subscribing notification, this mode can be with
" primary to subscribe to, repeatedly to return " will return to the change of NOTIFY message notice state as long as communications status changes immediately
Change.
The scheme of the disclosure can be extrapolated in IMS network the scene that obtains of terminal communications status in need, realize IMS
The demand of terminal communications status information opening.
So far, terminal communications status in IMS network according to the present invention is described in detail and obtains system, method kimonos
Business device.In order to avoid covering design of the invention, some details known in the field are not described.Those skilled in the art's root
According to above description, completely it can be appreciated how implementing technical solution disclosed herein.
Method and system of the invention may be achieved in many ways.For example, can by software, hardware, firmware or
Software, hardware, firmware any combination realize method and system of the invention.The said sequence of the step of for the method
Merely to be illustrated, the step of method of the invention, is not limited to sequence described in detail above, special unless otherwise
It does not mentionlet alone bright.In addition, in some embodiments, also the present invention can be embodied as to record program in the recording medium, these programs
Including for realizing machine readable instructions according to the method for the present invention.Thus, the present invention also covers storage for executing basis
The recording medium of the program of method of the invention.
Although some specific embodiments of the invention are described in detail by example, the skill of this field
Art personnel it should be understood that above example merely to being illustrated, the range being not intended to be limiting of the invention.The skill of this field
Art personnel are it should be understood that can without departing from the scope and spirit of the present invention modify to above embodiments.This hair
Bright range is defined by the following claims.
Claims (8)
1. terminal communications status acquisition methods in a kind of IP multimedia subsystem IMS network characterized by comprising
Mediaphone application server receives the target terminal state subscription request from subscriber, the target terminal state
Subscribing to request includes subscriber address and the public subscriber identification for subscribing to terminal user, wherein the target terminal state subscription
Request sends to subscribe to message by Session initiation Protocol SIP to the mediaphone application server, and the SIP subscription disappears
The parameter value of the event header field of breath is set as call-status, and service call conversation control function S-CSCF receives SIP subscription and disappears
Breath, whether the Event event header field for judging that the SIP subscribes to message is call-status；If it is, S-CSCF directly will
The SIP subscribes to message and is forwarded to the mediaphone application server；
The mediaphone application server sends target terminal state notification message, the target terminal to the subscriber
State notification message includes the Current Communications Status for subscribing to terminal user；
If the state changes for subscribing to terminal user, the mediaphone application server is to the subscriber
Send target terminal communications status more new information.
2. the method according to claim 1, wherein the mediaphone application server saves terminal communication
State, as terminal communications status information source；
And/or
After the mediaphone application server receives the target terminal state subscription request, with recording the subscriber
Location and the public subscriber identification for subscribing to terminal user.
3. the method according to claim 1, wherein by SIP notification message to described in subscriber transmission
Subscribe to the communications status of terminal user, wherein the parameter value of the event header field of the SIP notification message is set as call-status；
Alternatively,
The communications status for subscribing to terminal user is sent to the subscriber by SIP notification message, wherein the SIP is logical
Know that the parameter value of the Content-Type message body content type header field of message is set as application/call-status.
4. a kind of mediaphone application server characterized by comprising
Request receiving module is subscribed to, for receiving the target terminal state subscription request from subscriber, the target terminal shape
It includes subscriber address and the public subscriber identification for subscribing to terminal user, the target terminal state subscription request that state, which subscribes to request,
It is sent to subscribe to message by Session initiation Protocol SIP to the mediaphone application server, the SIP subscribes to message
The parameter value of event header field is set as call-status, and service call conversation control function S-CSCF receives SIP and subscribes to message, sentences
The SIP that breaks subscribes to whether the Event event header field of message is call-status；If it is, S-CSCF directly will be described
SIP subscribes to message and is forwarded to the mediaphone application server；
Notification message sending module, for sending target terminal state notification message, the target terminal shape to the subscriber
It include the Current Communications Status for subscribing to terminal user in state notification message；
State updates sending module, if sent out for the state changes for subscribing to terminal user to the subscriber
Send target terminal communications status more new information.
5. server according to claim 4, which is characterized in that further include information storage module；
The information storage module is for saving terminal communications status, as terminal communications status information source；
And/or
The information storage module records the subscriber address and institute for receiving the target terminal state subscription request
State the public subscriber identification for subscribing to terminal user.
6. server according to claim 4, which is characterized in that the target terminal state notification message is SIP notice
Message, wherein the parameter value of the event header field of the SIP notification message is set as call-status；
Alternatively,
The target terminal state notification message is SIP notification message, wherein the Content-Type of the SIP notification message
The parameter value of message body content type header field is set as application/call-status.
7. terminal communications status obtains system in a kind of IP multimedia subsystem IMS network, which is characterized in that wanted including such as right
Seek mediaphone application server described in any one of 4-6.
8. system according to claim 7, which is characterized in that further include service call conversation control function S-CSCF；Institute
S-CSCF is stated for judging that the received SIP subscribes to whether the Event event header field of message is call-status；If so,
SIP subscription message is directly then forwarded to the mediaphone application server.
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| CN106412855B (en) * | 2016-06-30 | 2020-11-27 | 北京小米移动软件有限公司 | Information reminding and transmitting method and device |
| KR101821054B1 (en) * | 2016-08-25 | 2018-01-23 | 문병진 | Method for supporting the matching between a teacher and a student of telephone lessons |
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