CN104601539B - The method and device of calling - Google Patents

Abstract

The invention discloses a call method and device, relates to the field of information technology, and can execute the follow-up service of the conversation. The method includes: being applied to a call system, the call system includes a calling terminal, a called terminal and a network server, the calling terminal initiates a session to the called terminal, the called terminal and the network server belong to the second network, and the session includes cross-network For services, cross-network services need to be anchored from the first network to the second network for execution; the network server first receives the session anchored by the second network, and determines whether there is a session tag in the tag list according to the session identifier. The label list is used to store the labels of each session currently in progress. The label of the session includes the identification of the session and the current process of the session. If there is a label of the session in the label list, the current process of the session is obtained, and finally the process of the current process of the session is executed. follow-up business. The present invention is suitable for performing services in sessions.

Description

Method and device for calling

technical field

The invention relates to the field of information technology, in particular to a calling method and device.

Background technique

With the development of information technology, there are more and more types of services included in the sessions initiated by the calling end to the called end. Wherein, the called end may belong to the mobile network, and the session initiated by the calling end to the called end may include cross-network services, and cross-network services refer to services that need to be anchored by the mobile network to the fixed network for execution.

At present, there is a calling method. When a session is established between the calling terminal and the called terminal, and the called terminal belongs to the mobile network, the network server in the mobile network sequentially executes each service included in the current session. Network services, such as the need to perform one-number-many-machine services, the network server will anchor the session from the mobile network to the fixed network, so that the cross-network service can be performed in the fixed network, and the session after the execution of the cross-network service The net is anchored back to the mobile net.

However, when the session after performing the cross-network service is anchored back to the mobile network by the fixed network, because the network server in the mobile network cannot recognize the current session as a session after performing the cross-network service, the network server regards the received session as For the first call, the various services included in the current session are executed sequentially again, causing the session to be repeatedly anchored to the fixed network to execute the same cross-network service, resulting in the inability to execute subsequent services of the session.

For example, if the current session contains 5 services, and service 3 is a cross-network service, the network server first executes service 1 and service 2 sequentially, and then anchors the session to the fixed network to execute service 3. However, when the network server receives When the session is anchored back to the mobile network, it cannot be recognized that the session has executed business 1, business 2, and business 3, so the network server executes business 1 and business 2 in sequence again, and anchors to the fixed network again to execute business 3, resulting in failure to execute Subsequent business 4 and business 5.

Contents of the invention

The invention provides a call method and device, which can execute the follow-up service of the conversation.

The technical scheme adopted in the present invention is:

In a first aspect, the present invention provides a method for calling, which is applied to a calling system, the calling system includes a calling terminal, a called terminal and a network server, the calling terminal initiates a session to the called terminal, the The called end and the network server belong to the first network, the session includes cross-network services, and the cross-network services need to be anchored from the first network to the second network for execution; the method includes:

the network server receives the session anchored back by the second network;

The network server determines whether there is a label of the session in the label list according to the identification of the session, and the label list is used to store the labels of each session currently in progress, and the label of the session includes the identification of the session and the current progress of said session;

If the label of the session exists in the label list, the network server obtains the current process of the session, and the current process is the identifier of the service executed by the session;

The web server performs subsequent services for the current progress of the session.

In a second aspect, the present invention provides a calling device, which is used in a network server. The network server is located in a calling system, and the calling system also includes a calling terminal and a called terminal. The calling end initiates a session, the called end and the network server belong to the first network, the session includes cross-network services, and the cross-network services need to be anchored to the network server by the second network Carried out in; Said device comprises:

a receiving unit, configured to receive a session anchored back by the second network;

A determining unit, configured to determine whether a tag of the session exists in a tag list according to the identifier of the session received by the receiving unit, the tag list is used to store the tags of each session currently in progress, and the tag of the session The label includes the identification of the session and the current process of the session;

An acquiring unit, configured to acquire the current progress of the session when the determining unit determines that the tag of the session exists in the tag list, where the current progress is an identifier of a service executed by the session;

An executing unit, configured to execute the follow-up service of the current process of the session acquired by the acquiring unit.

The calling method and device provided by the present invention are applied to a calling system. The calling system includes a calling terminal, a called terminal and a network server. The calling terminal initiates a session to the called terminal, and the called terminal and the network server belong to the first network. , the session includes cross-network services, and the cross-network services need to be anchored from the first network to the second network for execution; the network server first receives the session anchored by the second network, and returns the session anchored by the second network according to the received The identification of the session, determine whether there is a session tag in the tag list, the tag list is used to store the tags of each session currently in progress, the session tag includes the session ID and the current process of the session, if there is a session tag in the tag list , then get the current process of the session, and finally execute the follow-up business of the current process of the session. Compared with the current session that is repeatedly anchored to the fixed network to execute the same cross-network service, the present invention determines whether there is a session label in the label list through the network server, and can determine whether there is an executed service in the session, thereby realizing execution The follow-up service of the current process of the session can avoid the session being repeatedly anchored to the fixed network to perform the same cross-network service, and then the follow-up service of the session can be performed.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the present invention or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. For some embodiments of the present invention, those skilled in the art can also obtain other drawings according to these drawings without paying creative efforts.

Fig. 1 is the schematic diagram of calling system in the embodiment of the present invention;

Fig. 2 is the method flowchart of calling in the embodiment of the present invention;

FIG. 3 is a flow chart of another calling method in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a calling device in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another calling device in an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention can be used in a calling system, as shown in FIG. 1 . Among them, the call system includes a calling terminal, a called terminal and a network server. The calling terminal initiates a session to the called terminal. The called terminal and the network server belong to the first network. The session includes cross-network services, which need to be provided by the first network. One network is anchored to the second network for execution, for example, the cross-network service may be a one-number-many-machine service. Wherein, the first network is a mobile network, and the second network is a fixed network; or, the first network is a fixed network, and the second network is a mobile network.

An embodiment of the present invention provides a method for calling, which can perform subsequent services of a session, as shown in FIG. 1 , the method includes:

201. The network server receives a session anchored by the second network.

Wherein, the network server may be an S-CSCF (Sever-Call Session Control Function, call session control function network server) network element, or may be an AS (Application Server, application network server).

For the embodiment of the present invention, before step 201, it may also include: the network server sequentially executes the various services included in the session, and if it is necessary to perform cross-network services, the network server anchors the session from the first network to the second network, so that the The cross-network service can be performed in the second network, and the session after performing the cross-network service is anchored back to the first network by the second network.

202. The network server determines whether the session tag exists in the tag list according to the session ID.

Wherein, the label list is used to store the labels of each session currently in progress, and the label of the session includes the identification of the session and the current process of the session.

For this embodiment of the present invention, the tag list may specifically be stored in a network server.

For the embodiment of the present invention, the session tag may specifically include a session identifier, calling device information, called device information, and the current process of the session. For example, the form of the session tag stored in the network server may specifically be: Session ID 1, Calling party number, Called party number, Service Tag.

203. If the label of the session exists in the label list, the web server obtains the current process of the session.

Wherein, the current process is the identifier of the service executed by the session. In the embodiment of the present invention, the current process is used to indicate the services currently executed by the session, so that the network server continues to execute subsequent unexecuted services.

For the embodiment of the present invention, if the current process of the session is the last service of the session, that is, all services included in the session have been executed, the network server sends the session to the next network element for subsequent operations.

204. The network server executes follow-up services of the current process of the session.

For the embodiment of the present invention, step 204 may specifically be: the network server executes the follow-up service of the current process of the session according to the iFC (Initial Filter Criteria, initial filter rule) rule. For example, if the current process is service 2, the network server executes subsequent service 3 in sequence according to the iFC rules.

For example, if the current session contains 5 services, and service 3 is a cross-network service, the network server first executes service 1 and service 2 sequentially, and then anchors the session to the fixed network to execute service 3. With the current existing method, when the network server receives a session anchored by the second network back to the first network, it cannot recognize that the session has executed service 1, service 2, and service 3, so the network server executes service 1 and service 3 in sequence again. Business 2, and anchored to the fixed network again to execute business 3, resulting in the inability to execute subsequent business 4 and business 5; and through the method provided by the embodiment of the present invention, when the network server receives the second network anchored back to the first network In a session, by querying the label corresponding to the session, the network server determines that the session has executed service 1, service 2, and service 3, and thus can execute subsequent service 4 and service 5.

The calling method provided by the embodiment of the present invention is applied to a calling system. The calling system includes a calling terminal, a called terminal and a network server. The calling terminal initiates a session to the called terminal, and the called terminal and the network server belong to the first network. , the session includes cross-network services, and the cross-network services need to be anchored from the first network to the second network for execution; the network server first receives the session anchored by the second network, and returns the session anchored by the second network according to the received The identification of the session, determine whether there is a session tag in the tag list, the tag list is used to store the tags of each session currently in progress, the session tag includes the session ID and the current process of the session, if there is a session tag in the tag list , then get the current process of the session, and finally execute the follow-up business of the current process of the session. Compared with the current session that is repeatedly anchored to the fixed network to execute the same cross-network service, the embodiment of the present invention determines whether there is a session label in the label list through the network server, and can determine whether there is an executed service in the session, so that Implementing the follow-up services of the current process of the session can prevent the session from being repeatedly anchored to the fixed network to perform the same cross-network service, and then the follow-up services of the session can be performed.

As a specific description of the method shown in Figure 2, the embodiment of the present invention provides another calling method, as shown in Figure 3, the method includes:

301. The network server receives a session anchored by the second network.

Wherein, the network server may be an S-CSCF network element, or an AS.

For the embodiment of the present invention, before step 301, it may also include: the network server sequentially executes the various services included in the session, and if it is necessary to perform cross-network services, the network server anchors the session from the first network to the second network, so that the The cross-network service can be performed in the second network, and the session after performing the cross-network service is anchored back to the first network by the second network.

302. The network server determines whether the session tag exists in the tag list according to the session identifier.

Wherein, the label list is used to store the labels of each session currently in progress, and the label of the session includes the identification of the session and the current process of the session. In this embodiment of the present invention, the tag list may specifically be stored in a network server.

For the embodiment of the present invention, the session tag may specifically include a session identifier, calling device information, called device information, and the current process of the session. For example, the form of the session tag stored in the network server may specifically be: Session ID 1, Calling party number, Called party number, Service Tag.

For this embodiment of the present invention, the session anchored by the second network may carry a preset prefix. Wherein, the preset prefix is used to indicate that there is an executed cross-network service in the session. As an alternative to step 302: when the session received by the network server carries a preset prefix, the network server determines whether there is a label of the session in the label list according to the identifier of the session.

For the embodiment of the present invention, specifically, the session carrying the preset prefix may be used as the first call, and the session not carrying the preset prefix may be used as the second call. Wherein, the second call refers to a session in which cross-network services have already been executed. In the embodiment of the present invention, the network server determines whether the session carries a preset prefix, and further determines whether to search for the label of the session in the label list, which can avoid searching for the session label in the label list when the network server receives the first session. Tags, resulting in a large delay in executing the services in the session, so that the execution efficiency of the services in the session can be improved.

For the embodiment of the present invention, when the network server anchors the session from the first network to the second network, the corresponding network element in the second network first receives the session, and executes the corresponding cross-network service, and then in the header field of the session Add a preset prefix used to identify that the session has been executed, so that the first network can quickly identify the session, and finally anchor the session that has executed the cross-network service and added the preset prefix back to the first network. For example, the preset prefix can be "601" or "602".

Optionally, after step 302, the method may further include: if there is no session tag in the tag list, the network server executes the first service of the session according to the business order of the session, and adds the session tag to the tag list. Wherein, the current process included in the label is the identifier of the first service.

For the embodiment of the present invention, by adding the label of the session in the label list when executing the first service of the session, the service currently performed by the session can be recorded in the label of the session, so that the session can be anchored by the second network anchor When redirecting back to the first network, the network server can identify that there is an executed cross-network service in the session.

303. If the label of the session exists in the label list, the web server obtains the current progress of the session.

Wherein, the current process is the identifier of the service executed by the session. In the embodiment of the present invention, the current process is used to indicate the services currently executed by the session, so that the network server continues to execute subsequent unexecuted services.

For the embodiment of the present invention, if the current process of the session is the last service of the session, that is, all services included in the session have been executed, the network server sends the session to the next network element for subsequent operations.

304. The web server executes follow-up services of the current process of the session.

For the embodiment of the present invention, step 304 may specifically be: the network server executes the follow-up service of the current process of the session according to the iFC rule. For example, if the current process is service 2, the network server executes subsequent service 3 in sequence according to the iFC rules.

For example, if the current session contains 5 services, and service 3 is a cross-network service, the network server first executes service 1 and service 2 sequentially, and then anchors the session to the fixed network to execute service 3. With the current existing method, when the network server receives a session anchored by the second network back to the first network, it cannot recognize that the session has executed service 1, service 2, and service 3, so the network server executes service 1 and service 3 in sequence again. Business 2, and anchored to the fixed network again to execute business 3, resulting in the inability to execute subsequent business 4 and business 5; and through the method provided by the embodiment of the present invention, when the network server receives the second network anchored back to the first network In a session, by querying the label corresponding to the session, the network server determines that the session has executed service 1, service 2, and service 3, and thus can execute subsequent service 4 and service 5.

305. The network server modifies the current process of the session in the tag list to the identifier of the service executed by the network server.

For the embodiment of the present invention, by modifying the current process of the session to the cross-network service being executed by the network server, so that when the subsequent cross-network service needs to be performed, the network server executes the subsequent process of the current process according to the modified current process. Cross-network business.

For example, after the web server executes the subsequent business 3 in sequence according to the iFC rules, it modifies the current process of the session to business 3. When the session is anchored to the web server again, the web server can execute the subsequent business 3 by querying the current process. Other cross-network business.

306. When the session ends, the network server deletes the session tag in the tag list.

For the embodiment of the present invention, by deleting the label of the session that has ended in the label list, the storage space occupied by the label list can be reduced, thereby avoiding the situation that the network server is overloaded; If there are too many, the time delay for the web server to query a certain session tag is too large, so that the time delay for the web server to query the session tag in the tag list can be reduced.

The calling method provided by the embodiment of the present invention is applied to a calling system. The calling system includes a calling terminal, a called terminal and a network server. The calling terminal initiates a session to the called terminal, and the called terminal and the network server belong to the first network. , the session includes cross-network services, and the cross-network services need to be anchored from the first network to the second network for execution; the network server first receives the session anchored by the second network, and returns the session anchored by the second network according to the received The identification of the session, determine whether there is a session tag in the tag list, the tag list is used to store the tags of each session currently in progress, the session tag includes the session ID and the current process of the session, if there is a session tag in the tag list , then get the current process of the session, and finally execute the follow-up business of the current process of the session. Compared with the current session that is repeatedly anchored to the fixed network to execute the same cross-network service, the embodiment of the present invention determines whether there is a session label in the label list through the network server, and can determine whether there is an executed service in the session, so that Implementing the follow-up services of the current process of the session can prevent the session from being repeatedly anchored to the fixed network to perform the same cross-network service, and then the follow-up services of the session can be performed.

Furthermore, in the call method provided by the embodiment of the present invention, the network server determines whether the session carries a preset prefix, and further determines whether to search for the label of the session in the label list, which can avoid when the network server receives the first session. Look up the label of the session in the label list, resulting in a large delay in executing the business in the session, which can improve the execution efficiency of the business in the session; determine whether the session carries a preset prefix through the network server, and further determine whether it is in the label Searching for session tags in the list can avoid the situation that when the network server receives the first session, it will search for the session tags in the tag list, resulting in a large delay in executing the business in the session, thereby improving the execution efficiency of the business in the session ;By modifying the current process of the session to the cross-network service being executed by the network server, so that when the subsequent cross-network service needs to be performed, the network server executes the subsequent cross-network service of the current process according to the modified current process; by deleting The tag of the session that has ended in the tag list can reduce the storage space occupied by the tag list, thereby avoiding the situation that the network server is overloaded, and can avoid the network server querying a certain session due to the excessive number of session tags in the tag list. When the time delay of the session tag is too large, the time delay for the network server to query the session tag in the tag list can be reduced.

Further, as an implementation of the methods shown in FIG. 2 and FIG. 3 , the embodiment of the present invention also provides a calling device, which is used in a network server. The network server is located in the calling system, and the calling system also includes a calling terminal and a called terminal. The calling end, the calling end initiates a session to the called end, the called end and the network server belong to the first network, the session includes cross-network services, and the cross-network services need to be anchored to the network server by the second network for execution. To execute the follow-up service of the session, as shown in FIG. 4 , the device includes: a receiving unit 41 , a determining unit 42 , an acquiring unit 43 , and an executing unit 44 .

The receiving unit 41 is configured to receive the session anchored by the second network.

The determining unit 42 is configured to determine whether there is a session tag in the tag list according to the session identifier received by the receiving unit 41 .

Wherein, the label list is used to store the labels of each session currently in progress, and the label of the session includes the identification of the session and the current process of the session.

The acquiring unit 43 is configured to acquire the current process of the session when the determining unit 42 determines that there is a tag of the session in the tag list.

Wherein, the current process is the identifier of the service executed by the session.

The executing unit 44 is configured to execute the follow-up service of the current process of the session acquired by the acquiring unit 43 .

The execution unit 44 is further configured to execute the first service of the session according to the order of services of the session when there is no label of the session in the label list.

Further, as shown in FIG. 5 , the device further includes: an adding unit 51 .

The adding unit 51 is configured to add a session tag in the tag list after the executing unit 44 executes the first cross-network service of the session.

Wherein, the current process included in the label is the identifier of the first service.

Optionally, the device further includes: a modifying unit 52 .

The modifying unit 52 is configured to modify the current process of the session in the tag list to the identifier of the service executed by the executing unit 44 .

The session anchored by the second network received by the receiving unit 41 carries a preset prefix.

Wherein, the preset prefix is used to indicate that there is an executed cross-network service in the session.

Optionally, the device further includes: a deletion unit 53 .

The deleting unit 53 is configured to delete the label of the session in the label list when the session ends.

The calling device provided by the embodiment of the present invention is applied to a calling system. The calling system includes a calling terminal, a called terminal and a network server. The calling terminal initiates a session to the called terminal, and the called terminal and the network server belong to the first network. , the session includes cross-network services, and the cross-network services need to be anchored from the first network to the second network for execution; the network server first receives the session anchored by the second network, and returns the session anchored by the second network according to the received The identification of the session, determine whether there is a session tag in the tag list, the tag list is used to store the tags of each session currently in progress, the session tag includes the session ID and the current process of the session, if there is a session tag in the tag list , then get the current process of the session, and finally execute the follow-up business of the current process of the session. Compared with the current session that is repeatedly anchored to the fixed network to execute the same cross-network service, the embodiment of the present invention determines whether there is a session label in the label list through the network server, and can determine whether there is an executed service in the session, so that Implementing the follow-up services of the current process of the session can prevent the session from being repeatedly anchored to the fixed network to perform the same cross-network service, and then the follow-up services of the session can be performed.

Furthermore, in the call device provided by the embodiment of the present invention, the network server determines whether the session carries a preset prefix, and further determines whether to search for the label of the session in the label list, which can avoid when the network server receives the first session. Look up the label of the session in the label list, resulting in a large delay in executing the business in the session, which can improve the execution efficiency of the business in the session; determine whether the session carries a preset prefix through the network server, and further determine whether it is in the label Searching for session tags in the list can avoid the situation that when the network server receives the first session, it will search for the session tags in the tag list, resulting in a large delay in executing the business in the session, thereby improving the execution efficiency of the business in the session ;By modifying the current process of the session to the cross-network service being executed by the network server, so that when the subsequent cross-network service needs to be performed, the network server executes the subsequent cross-network service of the current process according to the modified current process; by deleting The tag of the session that has ended in the tag list can reduce the storage space occupied by the tag list, thereby avoiding the situation that the network server is overloaded, and can avoid the network server querying a certain session due to the excessive number of session tags in the tag list. When the time delay of the session tag is too large, the time delay for the network server to query the session tag in the tag list can be reduced.

It should be noted that for other corresponding descriptions corresponding to each unit in the calling device provided in the embodiment of the present invention, reference may be made to the corresponding descriptions in FIG. 2 and FIG. 3 , and details are not repeated here.

The calling device provided by the embodiment of the present invention can implement the method embodiment provided above. For specific function realization, please refer to the description in the method embodiment, and details will not be repeated here. The calling method and device provided by the embodiments of the present invention may be applicable to performing services in a session, but are not limited thereto.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. a kind of method of calling, applied to calling system, it is characterised in that the calling system includes calling terminal, called end And the webserver, the calling terminal initiate session to the called end, the called end and the webserver belong to First network, the session include across a network business, and the across a network business needs to be anchored into the second net by the first network Performed in network；Methods described includes：

The webserver receives the session returned by second network anchor；

The webserver determines to whether there is the label of the session, institute in list of labels according to the mark of the session The label that list of labels is used to store current ongoing each session is stated, the label of the session includes the mark of the session Knowledge and the current process of the session；

If the label of the session in the list of labels be present, working as the webserver acquisition session is advanced Journey, the current process are the mark of the session carried traffic；

The webserver performs the follow-up business of the current process of the session.

2. the method for calling according to claim 1, it is characterised in that methods described also includes：

If the label of the session is not present in the list of labels, the webserver is suitable according to the business of the session Sequence, perform first business of the session；

The webserver adds the label of the session in the list of labels, and the current process that the label includes is The mark of first business.

3. the method for calling according to claim 1, it is characterised in that the webserver performs working as the session After the step of follow-up business of preceding process, in addition to：

The current process of session described in the list of labels is revised as the webserver and performed by the webserver Business mark.

4. the method for calling according to claim 1, it is characterised in that the session that second network anchor returns carries Preset prefix, the preset prefix are used to indicate the across a network business that executed in the session be present.

5. the method for calling according to claim 1, it is characterised in that methods described also includes：

When the conversation end, the webserver deletes the label of session described in the list of labels.

A kind of 6. device of calling, in the webserver, the webserver to be located at calling system, it is characterised in that The calling system also includes calling terminal and called end, and the calling terminal initiates session to the called end, the called end and The webserver belongs to first network, and the session includes across a network business, and the across a network business is needed by described First network is anchored into the second network and performed；Described device includes：

Receiving unit, for receiving the session returned by second network anchor；

Determining unit, for the mark of the session received according to the receiving unit, determine to whether there is in list of labels The label of the session, the list of labels are used for the label for storing current ongoing each session, the mark of the session Label include the mark of the session and the current process of the session；

Acquiring unit, for when the determining unit determines to exist in the list of labels label of the session, obtaining institute The current process of session is stated, the current process is the mark of the session carried traffic；

Execution unit, the follow-up business of the current process of the session obtained for performing the acquiring unit.

7. the device of calling according to claim 6, it is characterised in that

The execution unit, it is additionally operable to when the label of the session is not present in the list of labels, according to the session Work flow, perform first business of the session；

Described device also includes：Adding device；

The adding device, for perform the session in the execution unit first across a network business after, in the mark The label of the session is added in label list, the current process that the label includes is the mark of first business.

8. the device of calling according to claim 6, it is characterised in that described device also includes：Change unit；

The modification unit, performed for the current process of session described in the list of labels to be revised as into the execution unit Business mark.

9. the device of calling according to claim 6, it is characterised in that

The session that second network anchor that the receiving unit receives returns carries preset prefix, and the preset prefix is used for Indicate the across a network business that executed in the session be present.

10. the device of calling according to claim 6, it is characterised in that described device also includes：Delete unit；

The deletion unit, for when the conversation end, deleting the label of session described in the list of labels.