WO2018001229A1

WO2018001229A1 - Method, application server and system for realizing call park

Info

Publication number: WO2018001229A1
Application number: PCT/CN2017/090244
Authority: WO
Inventors: 钱晨; 屈天喜
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-06-30
Filing date: 2017-06-27
Publication date: 2018-01-04
Also published as: CN107567001A

Abstract

Provided are a method, application server and system for realizing call park. The method comprises: after a call park initiation terminal reports a park trigger message, playing a call hold prompt tone for a call hold terminal, and then, when a call park message of the call park initiation terminal carries a pre-set hold service code, recording park access information, releasing the call park initiation terminal, and performing a subsequent connection process; and receiving a call request message from a call pick-up terminal, and when the call request message matches the park access information, stopping playing the tone to the call hold terminal, and getting through the call pick-up terminal and the call hold terminal. With respect to the fact that a terminal must support a two-way call or support the transmission of a refer message in the related art, an existing ordinary terminal can be used in the disclosure. Therefore, the disclosure is favourable for reducing the requirements of call park for a terminal, improving the utilization rate of an existing terminal, reducing the cost for realizing a call park service, improving the user experience, and is more practical.

Description

Method, application server and system for realizing call resident

Technical field

The present disclosure relates to the field of communications technologies, and in particular, to a method, an application server, and a system for implementing call camping.

Background technique

At present, in the call service, a call camp service is provided, and the call camp service includes two parts: a camp and a connection. The meaning is that after any user A makes a call with the service user B, the user B initiates a park operation, and the user A is Keep, in the state of not hanging up, user B exits the current call, this process realizes the resident of A. During the maintenance of A, user C dials the specified service code plus the number of user B. The AS (Application Server) associates user C with user A, and user A talks with user C. This process implements A's. Continued.

In the related art, the following solutions are generally implemented to implement call camping;

First, the terminal corresponding to the user B is a relatively advanced SIP terminal and has the capability of transmitting a REFER message. The REFER message carries the specified service code ac1 to the AS, the AS keeps the user A and releases B, and the C dials the specified service code ac2 plus the user. The number of B arrives at the AS, and the AS associates user C with user A to implement residency and connection.

Second, the terminal corresponding to user B has the capability of two-way calling, and can make another new call on the basis of already talking. The requested called number is the designated service code ac1 to the AS, and the AS keeps user A and releases B. C dials the specified service code ac2 plus the number of user B to reach the AS, and AS associates user C with user A to implement the resident and connection.

Obviously, in the related art, there is a special requirement for a terminal that implements a call camping service, and a SIP terminal that transmits a REFER message function or a terminal that has a two-way calling function is required, but a terminal that is used or sold in the market, such as a smart phone, etc. Generally, these functions are not available. Therefore, how to reduce the requirements of the call resident service to the terminal and the use of the ordinary terminal to implement call camping are urgent problems to be solved by related technologies.

Summary of the invention

The main technical problem to be solved by the embodiments of the present disclosure is to provide a method, an application server, and a system for implementing call camping, and to solve the limitation of the terminal and the call by using a higher-level terminal to implement call camping in the related art. The cost of resident services is high, the utility is poor, and the adaptability is poor.

To solve the above technical problem, an embodiment of the present disclosure provides a method for implementing call camping, including:

Receiving a call in the call to camp on the resident triggering message reported by the initiating terminal;

When the camping trigger message carries the preset button service feature code, the call holding terminal in the call performs media negotiation of the call hold and play service, and controls the media server to play the call hold tone to the call holding terminal;

Receiving a call in the call to camp on the call park message reported by the originating terminal;

When the call camp message carries the preset camping service code, record the resident access information of the current call, and release the call camping initiation terminal;

Receiving a call request message initiated by the call picking up terminal, the call request message carrying the dialing button by the call picking up terminal a message generated after the key signal conversion process;

When the call request message matches the resident access information, the control media server stops playing the call hold tone to the service hold terminal, and connects the call pickup terminal to the call hold terminal.

To solve the above technical problem, an embodiment of the present disclosure further provides an application server that implements call residing, including:

a receiving module, configured to receive a camping trigger message reported by the call camping initiating terminal in the call, receive a call camp message reported by the call camping initiating terminal, and receive a call request message initiated by the call picking terminal; The request message carries a message generated by the dial button signal conversion processing of the call picking terminal;

The control module is configured to: when the resident trigger message carries the preset button service feature code, perform media negotiation with the call holding terminal in the call to maintain the call service, and control the media server to play the call hold tone to the call holding terminal; When the call camp message carries the preset camping service code, the resident call information of the current call is recorded, and the call camp originating terminal is released; when the call request message matches the camping access information, the control media server stops The service keeps the terminal playing the call hold tone, and connects the call pickup terminal to the call hold terminal.

To solve the above technical problem, an embodiment of the present disclosure further provides a system for implementing call camping, including: a media server and an application server as above;

The application server and the media server perform media negotiation of the resident service, and the media server is configured to send the media stream to the terminal corresponding to the resident service according to the media negotiation performed by the application server and the terminal corresponding to the resident service.

Embodiments of the present disclosure also provide a storage medium for storing program code for performing a method of implementing call camping as described above.

The embodiment of the present disclosure discloses a method, an application server, and a system for implementing call camping. After receiving the camping trigger message reported by the call initiating terminal, the media server can control the media server to play a call hold tone to the call holding terminal. The user does not want to hang up. After that, when the call park message that the call re-initiation terminal re-reports in the call carries the preset resident service code, the resident access information may be recorded, and then the call-resident originating terminal is released. Subsequent connection process: receiving a call request message initiated by the call picking terminal, and when the call request message matches the resident access information, controlling the media server to stop playing the call hold tone to the call holding terminal, and connecting the call pick up terminal with The call is held by the terminal. The terminal in the related art must be a terminal supporting a two-way call or a SIP terminal supporting a refer message transmission. Through the above mechanism, the terminal in the embodiment of the present disclosure can implement call camping by using an existing ordinary terminal. Therefore, the method of the embodiment of the present disclosure is advantageous for reducing the demand for the call resident to the terminal, improving the utilization of the existing terminal, reducing the cost of implementing the call resident service, improving the user experience, and being more practical.

DRAWINGS

FIG. 1 is a flowchart of a method for implementing call camping according to Embodiment 1 of the present disclosure;

FIG. 2 is a flowchart of another method for implementing call camping according to Embodiment 2 of the present disclosure;

3 is a flowchart of a method for converting a button signal into an INFO message according to Embodiment 2 of the present disclosure;

4 is a flowchart of another method for converting a button signal into an INFO message according to Embodiment 2 of the present disclosure;

FIG. 5 is a flowchart of a method for implementing call camping according to Embodiment 2 of the present disclosure;

FIG. 6 is a schematic diagram of a module for implementing an application server for call residing according to Embodiment 3 of the present disclosure;

FIG. 7 is a schematic block diagram of a system for implementing call camping according to Embodiment 3 of the present disclosure.

detailed description

The present disclosure will be further described in detail below with reference to the accompanying drawings.

Embodiment 1:

The embodiment of the present invention provides a method for implementing call relocation. Compared with the existing method for implementing the call residing service, the terminal in the method of the embodiment only needs to have a basic call function, and does not need to have a special support function. The buttons (keys other than *, #, 0-9) have the function of sending a refer message; there is also no need to support the function of a two-way call. Therefore, the method in this embodiment is applicable to all existing terminals, has good practicability, expands the extensive application, saves deployment costs, and improves user experience.

Referring to FIG. 1, the method for implementing call camping provided by this embodiment includes:

S101. The call in the call is in the presence of a call trigger message reported by the initiating terminal.

The resident trigger message is a message generated after the trigger button signal conversion process of the call resident originating terminal;

S102. When the camping trigger message carries the preset button service feature code, perform media negotiation with the call holding terminal in the call to maintain the voice play service, and control the media server to play the call hold tone to the call hold terminal;

S103. The call in the call is camped on the call resident message reported by the initiating terminal.

The call camp message is a message generated after the call button signal conversion process of the call camp originating terminal;

S104. When the call camp message carries a preset resident service code, record the resident access information of the current call, and release the call camping initiation terminal.

S105. Receive a call request message initiated by the call picking terminal, where the call request message carries a message generated by the dial button signal conversion process of the call picking terminal;

S106. When the button signal carried in the call request message matches the resident access information, the control media server stops playing the call hold tone to the call holding terminal, and connects the call pickup terminal to the call hold terminal.

In this embodiment, the call camping initiating terminal, the call holding terminal, and the call picking terminal belong to a user equipment (User Equipment, UE), which is a device for the user to initiate a call, answer the call, and perform other call operations, and may be a C network or The terminal device having a call function, such as a G network mobile phone, a PSTN terminal, and an IMS terminal, is not limited in this embodiment. The call resident originating terminal may be a calling terminal or a called terminal.

The number of call holding terminals in this embodiment is not limited to one. When the call camping initiating terminal and the call holding terminal are multi-party calls in S101, other terminals may be in addition to the call camping initiating terminal where the call camping is initiated. It is considered to be a call holding terminal. In step S102, it can be understood that the media negotiation of the call hold and play service is performed with at least one call holding terminal in the call, and the control media server plays the call hold prompt tone to the at least one call holding terminal.

The function of the media server in this embodiment is to provide various required voice resources for the terminal in the process of the call residing. The media server belongs to a media resource server (MRS) and can provide Voice media capabilities, such as playing a call hold tone to the held party user during call hold. The information transmission between the MRS and the UE is the transmission of the media stream, and the information such as the decoding format, the transceiver port, and the broadband transmission speed of the media packet between the UE and the MRS needs to be determined according to media negotiation between the UE and the MRS.

It is assumed that the user who operates the call park originating terminal is the user B, and the user who operates the call holding terminal is the user A. It is conceivable that, in step S101, the user B triggers the call camping initiation terminal during the call with the user A. The key-initiating terminal generates a trigger button signal according to the button triggered by the user. The trigger button signal includes the button number triggered by the user B. In this embodiment, the button numbers include but are not limited to *, #, 0 Any combination of numbers such as -9, when these button numbers are the same as the preset case service feature code, the resident service is triggered, and the call of the call holding terminal is maintained.

Generally, in order to prevent the call holding terminal from hearing the operation of the call camping originating terminal, and also to remind the user A not to hang up, the call holding terminal is kept in the calling state. The call hold tone needs to be played to the call holding terminal in the call, prompting the user A to be in the call hold state, and no need to hang up. The playback of the call hold tone requires the MRS to provide voice media. In S102, after the camping service is triggered, media negotiation with the call holding terminal to perform a call hold and play service is required, and the media server is controlled to play a call hold tone to the call holding terminal.

The above-mentioned media negotiation with the call holding terminal in the call to maintain the voice-holding service includes the process of obtaining the media information of the call holding terminal to inform the MRS, and obtaining the media information of the MRS to notify the call holding terminal, where the MRS and the call holding terminal mutually In the case where the media information of the other party is known, the media server MRS can play a call hold prompt tone to the call holding terminal UE according to the media information. The media information of this embodiment may be SDP media information, including an IP address, a port number, a media capability such as audio, video, an encoding format, and the like.

Generally, after the user performs a button operation on a terminal, the terminal automatically generates a button signal according to the button number, and the types of the button signals include but are not limited to DTMF (Double Tone Multi Frequency). signal. During the actual call, the foregoing steps in this embodiment are performed under the control of an application server (AS). Therefore, the resident trigger signal received by the AS must be a signal that can be recognized by itself, so it can be understood that In this embodiment, the trigger button signal and the resident button signal of the call resident originating terminal and the dial button signal of the call pickup terminal need to be converted from the DTMF signal to the AS identifiable signal. The AS generally provides the underlying service capabilities, such as call control, status reporting, and bill generation.

Generally, the AS negotiates with the MRS or the UE for the media of the call, and the AS and the UE use the SIP protocol to communicate with each other through the core network; the SIP protocol or the MGCP protocol is usually used between the AS and the MRS, for example, the type of the protocol supported by the MRS; A media protocol such as H.248 can be used between AS and MRS. It can be understood that other available protocols can be used for communication between the AS, the MRS and the UE, and are not limited to the protocols listed above.

In this embodiment, the AS, the MRS and the UE are generally communicated through the core network, and the core network includes but is not limited to the IMS network or the NGN network. In actual implementation, the AS, the MRS, and the UE are accessed or anchored to the IMS network or the NGN. In the network.

When the AS and the UE communicate with each other through the core network using the SIP protocol, the key signals of the call resident originating terminal and the call pickup terminal need to be converted by the core network to generate an AS-identifiable SIP-compliant message, because the call resides. The key signal obtained after the terminal and the call pickup terminal receive the user's button number is generally a DTMF signal, so the core network generally converts the DTMF signal into a SIP protocol message. The types of SIP protocol messages include, but are not limited to, INFO messages (Session Initiation Protocol Information Messages). In practice, the general core network converts the button signals of the call camp originating terminal and the call pick up terminal into INFO messages.

However, it can be understood that, in addition to the key signal generated by the core network to convert the key signals of the terminals, the conversion processing of the key signals can be implemented by other devices, which is not limited in this embodiment.

In the process of the call holding terminal being held, in order to perform subsequent services, the call resident initiating terminal needs to perform subsequent key signal reporting, so that the AS performs subsequent control processing according to the button signal reported by the call camping initiating terminal. Therefore, in the process in which the call holding terminal is maintained, the call camping initiating terminal is in a state of playing and receiving the number. The playing here refers to the AS controlling the MRS to play the pre-recorded sound to the call camping initiating terminal, and the receiving number refers to It is to receive the button signal. It can be understood that the playback can be muted or can be a prompt tone input.

Generally, user B can input the resident button signal through the call camp originating terminal to inform the AS that it officially quits the current call, so that the AS releases the call camp originating terminal and accesses the new terminal to pick up the current call. In order to identify the service corresponding to the key signal carried in the message reported by the initiating terminal, the corresponding relationship between each service code and each service may be pre-stored in the AS. When the key signal carried by the message matches the preset resident service code, the AS determines that the call camping originating terminal has decided to exit the current call and needs to be released.

After the call park origination terminal is released, a call pickup terminal initiates a call to pick up the current call with the call holding terminal. In general, the call pickup terminal accesses the call by initiating a call request message to the AS, and the call request message actually carries the message generated according to the dial button signal conversion process of the call pickup terminal. It can be understood that, at a certain moment, the AS-controlled camping call is more than one way, that is, when the call holding terminal in this embodiment is in the hold state, there are other terminals in the call hold state, when the AS receives a certain When picking up a call request message for a parked call, it is necessary to determine which way the call is accessed based on the information in the call request message. The determining information is determined according to some characteristic information of the parked call. In this embodiment, it is defined as the resident access information, and the current call is recorded before the call resident originating terminal is released. Enter information.

The resident access information may be used to identify a current call and distinguish the call from other calls. Considering that in a certain call, the number of both parties of the call is unique, in this embodiment, the call holding terminal number and/or the call park originating terminal number can be used as the unique identifier of the call holding terminal and the call camp originating terminal. Resident access information for the call. In addition, since the AS is the main control unit for controlling the current call, and the current control of each call is globally controlled, the AS can assign the call holding terminal a identification information that uniquely identifies the call. In addition to the call holding terminal number and/or the call camping initiating terminal number mentioned above and the identification information assigned by the AS, the embodiment may also use other information that can identify the call of the call holding terminal as the resident access information.

After the call park origination terminal is released, the call pickup terminal can press a button to initiate a call request message requesting access to the current call. In S106, when the dialing button signal carried by the call request message matches the resident access information, the control media server stops playing the call holding tone to the call holding terminal, and connects the call holding terminal and the call pickup. The call of the terminal. The process in which the call between the call holding terminal and the call pickup terminal is connected can refer to the existing connection process.

It can be understood that, in this embodiment, after the call re-initiation terminal is released, the call with the call holding terminal can be re-enabled by initiating the call request message. Therefore, in this embodiment, the call pickup terminal may be The call holding terminal may be other terminals, which is not limited in this embodiment.

Before the call holding terminal is in the call hold state, and the call camping initiating terminal is not released, when the call camping initiating terminal wants to resume the current call, if the above manner is adopted, the call camping initiating terminal is first released, and then the receiving is performed. The call residing initiates a call request message initiated by the terminal. There are many steps required to re-access the call, and there are many steps for interaction with the AS, which increases the burden on the AS, increases the time required for re-access, and reduces The user experience. Therefore, the embodiment provides a method for re-accessing the current call by the call camping terminal before the call holding terminal is in the call hold state, and the call camping terminal is not released, to cancel the call hold of the call holding terminal. The call cancellation service code corresponding to the status setting is stored, and the correspondence between the release call hold service code and the call cancellation service is stored in the AS.

In another embodiment, if the call park origination terminal reports the release of the call hold service code in S103, S104 becomes the control media server to stop playing the call hold tone to the call holding terminal, and the call camp origination terminal is connected. The call is held by the terminal. There is no need to perform S105 and S106 again.

In this embodiment, in order to facilitate the call picking up terminal to access the current call, the resident access information may be notified to the call picking terminal in some manner, for example, in S105, before releasing the call camping initiating terminal, The camp-resident originating terminal is informed of the resident access information. The method of notification may be to directly play the resident access information for the call camp originating terminal. In addition, in this embodiment, after the call camping initiating terminal is released, the call camping initiating terminal may be notified of the camping access information. For example, the camping terminal number may be notified by using a short message, an email, or the like according to the call camping originating terminal number. Access information. Thereafter, the user B calling the initiating terminal can notify the user C of the call picking terminal by means of verbal notification, telephone, mail or short message.

In this embodiment, another notification mode is also provided. In this notification mode, the call-resident originating terminal is in the state of being played and received before being released. At this time, the call-resident originating terminal can report the call. Picking up the number of the terminal, the AS notifies the call pickup terminal of the resident access information based on the number of the call pickup terminal. That is, in S105, before releasing the call camping initiating terminal, if the number of the call picking terminal reported by the call camping initiating terminal is also received, the call picking terminal is notified of the camping access information according to the number of the call picking terminal. . The exemplary notification manner of notifying the call picking terminal of the parked access information according to the number of the call picking terminal includes: sending a short message, or sending a mail or calling the call picking terminal, after the call picking up terminal picks up the phone, The parking pickup terminal is voiced to inform the resident access information.

In the present embodiment, the camping access information of the present embodiment includes at least one of a call camping originating terminal number and a line number assigned to the camping service in order to accurately pick up the call by the call pickup terminal.

In this embodiment, the line number can be allocated by the AS for the camping service. It can be understood that the line numbers corresponding to different parked calls are different.

When the camping access information includes only the call camping originating terminal number, before releasing the call camping originating terminal, the calling party The step of calling the camping initiating terminal to inform the camping access information may be omitted, and the call camping initiating terminal directly informs the call picking terminal of its number.

When the resident access information is different, the call request reported by the corresponding call pickup terminal is also different. When the camping access information includes the resident originating terminal number, the button signal carried by the call request message includes a call picking service code plus a call camping originating terminal number;

When the camping access information includes a line number allocated for the resident service, the button signal carried by the call request message includes a call picking service code plus a line number;

When the camping access information includes a call camping originating terminal number and a line number allocated for the camping service, the button signal carried by the call request message includes a call picking service code plus a call camping originating terminal number, or a call picking service Code plus line number.

In this embodiment, when the user C picks up the call-resident originating terminal number by dialing the pick-up service code and picks up the call with the call-holding terminal, the line number may not be known, that is, the call-initiating terminal is not required. Or the AS informs the call pickup terminal of the line number. At this time, for security reasons, certain protection measures are needed to make a security judgment on the connection of the call pickup terminal, so as to prevent others from posing as a connection or a malicious connection. In view of this, in S106, when the dialing button signal carried by the call request message includes the call picking service code plus the call camping originating terminal number, before the call of the call picking terminal and the call holding terminal is connected, The verification mode is set to verify the call picking authority of the call picking terminal. If the call picking terminal has the call picking right, the call between the call picking terminal and the call holding terminal is turned on.

There are a plurality of preset verification methods, for example, pre-acquiring the user white list of the call resident originating terminal, and determining whether the call pickup terminal has the call pickup authority according to whether the number of the call pickup terminal is in the user white list; for example, in advance Set the privilege password, after the call picking up terminal initiates the call request message, play the prompt tone of the input privilege password, prompt the user of the call pickup terminal to report the privilege password, and judge the call pickup according to whether the reported password matches the preset password or not. Whether the terminal has the right to pick up the call, the user can report the permission password by means of a button or voice.

The above-mentioned call pick-up service code is used to identify that the call pick-up terminal initiates a call request message for picking up a call in a hold state, that is, picking up a call with the call-holding terminal, and carrying a call pick-up service in the call request message When the code plus call camps the originating terminal number, or when the call picks up the service code plus the line number, the AS determines which way the call pickup terminal picks up the call, and then connects. In this embodiment, the call pickup service code and the line number may be any combination of *, #, 1-9.

In this embodiment, the call request message is also a message type identifiable by the AS. Since the AS and the UE generally communicate with each other through the core network using the SIP protocol, the camping trigger message, the call park message, and the call request message are session initial protocol information messages. The IFNO message in this embodiment may be a message obtained by the core network according to the dial button signal of the call pickup terminal, the trigger button signal of the call resident originating terminal, and the resident button signal. It is conceivable that there may be more than one button number input by the user corresponding to the call request message and the resident call message and the call park message, so there are also corresponding dial button signals, trigger button signals and resident button signals. One.

In one embodiment, the INFO message can be a call request message or a resident trigger message or a call The message generated by all the key signal conversions corresponding to the resident message is called. At this time, the core network converts all the key signals into the same INFO message and forwards them to the AS. At the time of conversion, the core network may directly write the service code into the INFO message when generating the corresponding INFO message according to the correspondence between different key signals and different service codes; in addition, the core network may also only be in the INFO message. The key signal is written in, and the AS determines the corresponding service code according to the analyzed plurality of key signals. The correspondence between different key signals and different service codes includes: a correspondence between a trigger button signal and a button service feature code, a correspondence between a resident button signal and a mainstream service code, a dial button signal and a resident access information. Correspondence relationship.

In another embodiment, the INFO message may also be a message generated after a key signal conversion. At this time, each time the user presses a button, the button signal is converted into an INFO message and sent to the AS, so the INFO is received. On the device side, that is, the AS side, it is necessary to obtain the button number input by the user according to the INFO message converted by each button signal. The method for obtaining includes, but is not limited to, identifying a button signal carried in an INFO message converted by each button signal, and combining the button numbers recognized in the INFO message that is reported multiple times; or, converting each button signal The INFO messages are merged, and the merged INFO message is parsed, and the button numbers corresponding to the multiple keys are obtained to determine the corresponding service.

The method for implementing the call residing in this embodiment can be implemented on the basis of the existing terminal and the existing network element device, and the call is camped on the button during the call, wherein the station is reported according to the call camping initiation terminal. The trigger message can be used to control the media server to play a call hold tone to the call holding terminal, prompting the user not to hang up, and thereafter, the call park resident in the receiving call and the call resident according to the resident button signal conversion processing reported by the call originating terminal After the message, the resident access information may be recorded, and then the call resident originating terminal is released, and the subsequent connection process is performed: receiving the call request message initiated by the call picking terminal, the dialing button signal and the resident access carried in the call request message When the information is matched, the control media server stops playing the call hold tone to the call holding terminal, and connects the call pickup terminal to the call hold terminal. Through the above mechanism, the terminal in this embodiment can adopt the existing common terminal, and does not need to support the sending of the two-way call or the refer message. Therefore, the method in this embodiment is advantageous for reducing the demand for the call resident to the terminal, improving the utilization rate of the existing terminal, reducing the cost of implementing the call resident service, improving the user experience, and being more practical.

Embodiment 2:

Referring to FIG. 2, it is assumed that the user of the call holding terminal is user A, the user who calls the initiating terminal is user B, and the user who calls the picking terminal is user C. User B is in a call with User A, and User B can be either a calling party or a called party. The terminals used by users A, B, and C in this embodiment may be referred to as user equipments (UEs), which are devices for initiating calls, answering calls, and performing other call operations, including but not limited to C-network or G-network mobile phones. , PSTN terminal, IMS terminal, etc.

In this embodiment, the application server AS provides the underlying service capabilities, such as call control, status reporting, and bill generation. The media server MRS provides voice media capabilities, such as playing a call hold tone to the held party user during call hold.

In this embodiment, the protocol used in the network element is as follows:

The AS negotiates with the MRS or the UE for the media of the call. The AS and the UE use the SIP protocol to communicate with each other through the core network. The SIP protocol or the MGCP protocol is usually used between the AS and the MRS. For example, the protocol type supported by the MRS can be determined.

The media stream is transmitted between the UE and the MRS, the codec format of the UE and the MRS media packet, the transceiver port, the bandwidth transmission rate, and the like, and the media negotiation between the terminal UE and the MRS is performed according to the call.

This embodiment provides another method for implementing call camping, the method comprising:

S201, user B and user A are in a call, user B presses a button during the call, inputs a trigger button signal, and the call resident initiating terminal reports a resident trigger message including a trigger button signal.

S202. The core network converts the resident trigger message reported by the call camping initiation terminal into an INFO message and sends the message to the AS.

It can be understood that the message on the terminal side is generally the DTMF signal corresponding to the key signal, so the core network is also required to convert the user's key signal into an INFO message and report it to the AS. The key signal corresponding to the AS matching INFO message is the designated key service feature code such as *77.

Wherein, when the core network converts the key signal on the call resident originating terminal report from the DTMF signal to the INFO message and sends it to the AS. The core network may collect a specified button service feature code reported by the terminal, such as *77, and send an INFO message containing the specified button service feature code to the AS in the INFO message body; in addition, the core network may also report on the terminal. A button number is converted into an INFO message and sent to the AS. The AS receives a plurality of button numbers corresponding to the button service feature code to complete the matching of the specified button service feature code.

S203. The AS puts a call hold tone on the call holding terminal of the user A, and initiates the call release of the call to the call of the user B.

The sound of the sound collection and reception number may actually be an empty voice, that is, a silent sound or a null sound; or, the AS puts a call to the A to keep the prompt sound, and the received number here refers to the button number that continues to receive the user B. In this process, the signal of the user B received by the AS is actually the INFO message including the button number, that is, the call camp message in the first embodiment, and the button number corresponding to the INFO message, which can be understood as the station in the first embodiment. Leave the service code.

S204. Analyze the INFO message reported by the call camping initiating terminal. If the button signal is the designated service code corresponding to the hold state of the call holding terminal, go to S205; otherwise, go to S206.

S205. The AS stops the call holding of the call holding terminal of the user A, and associates the users A and B, so that the users A and B continue to enter the call state; at this time, the process ends.

S206. If the parsed key signal is empty or does not satisfy the requirement, proceed to S203; otherwise, proceed to S207.

S207. If the parsed key signal is the designated resident service code ac1 (such as *82), the AS camps on the call of the user B to initiate the terminal to receive the sound, and if the call is in the process of playing the number, the call resides. When the originating terminal reports the number of the call pickup terminal, the process proceeds to S209, otherwise, the process proceeds to S208.

S208. The AS informs the call camp originating terminal of the line number assigned to the camped service, releases the call camp originating terminal, and records the current camping access information.

At this time, it is necessary for the call camp originating terminal to inform the call pickup terminal of the line number.

S209. The AS releases the call camp originating terminal, and records the current camping access information, and informs the call picking terminal of the line number according to the number of the call picking terminal.

The resident access information is information related to the current call, and can be used to identify the current call holding terminal's call and distinguish it from other calls. The camped access information includes the line number in S207, and may also include a call park originating terminal number.

S210, user C dials the call picking service code ac2 (such as *83) plus the line number.

S211. The AS receives the call request message reported by the call pickup terminal, determines whether the key signal carried in the call request message is a call pickup service number plus a line number, and if yes, proceeds to S212; otherwise, proceeds to S209.

S212. The AS control media server stops playing the call hold tone to the call holding terminal, and the AS connects the call holding terminal to the call camp initiation terminal.

Wherein, in S210, the user C dials the call picking service code ac2 (such as *83) plus the call camping originating terminal number. Then the following steps are:

S211a, the AS receives the call request message reported by the call picking terminal, determines whether the key signal carried in the call request message is the correct call picking service number plus the call park originating terminal number, and if yes, proceeds to S212a, otherwise, enters S210 .

S212a: Perform call picking authority verification on the call picking terminal according to a preset verification manner, and the verification passes, and proceeds to S213, otherwise it does not enter S209.

S213a. The AS control media server stops playing the call hold tone to the call holding terminal, and the AS connects the call holding terminal to the call camp originating terminal.

Referring to FIG. 3, based on the above method for implementing call camping, the embodiment further provides a method for converting a button signal into an INFO signal. The CN is a Core Network (CN), such as an IMS network or an NGN network. In practice, the AS, the MRS, and the UE are connected or anchored to the ISM network or the NGN network. The method for converting the button signal of the embodiment into the INFO signal includes:

S301: User A and User B are in a call; the AS sends an INFO message to the CN to inform the CN that the matching button feature code *77 is required.

User B is a service user on the AS, and may be a calling party or a called party.

The INFO message is as follows. It can be understood that the message is only an example and does not limit the content of the embodiment.

S302. The CN sends a response 200 OK to the AS to send an INFO message.

S303. The user B presses a button during a call, such as pressing *; wherein the button number can be any combination of numbers and symbols in *, #, 0-9.

S304. User B continues to press a button during a call, such as pressing 7.

S305. User B continues to press a button during a call, such as pressing 7.

S306. The CN receives the content of the button of the user B as *77, and matches the content of the button to the button feature code *77. The CN sends an INFO message to the AS, and the INFO message body contains the corresponding content such as *77.

In the S306, if the button number input by the user B is another key content such as 123#, *78, etc., the CN does not send an INFO message to the AS, that is, in this embodiment, The CN completes the matching and screening of the button number and the button feature code. Of course, in another embodiment, the CN may perform the matching and filtering, directly convert the user B's key code into an INFO message, and send it to the AS, and the AS performs matching and screening. At this time, step S301 is no longer needed.

The content of the INFO message sent by the CN is as follows in the step S306. It is to be understood that the message is only an example, and is not limited in this embodiment.

S307: The AS sends a response 200 OK to the CN to the INFO message. If the button number in the INFO message received by the AS matches the key signature of the button, the subsequent process is performed.

Referring to FIG. 4, the embodiment further provides another method for converting a button signal into an INFO signal, where the UE B is understood to be the call camp originating terminal of the user B, and the method includes:

S401. When user A and user B are in a call, user B presses a button during a call, such as pressing *.

The user B is a service user on the AS, and may be a calling party or a called party. The button number of the user B may be any combination of numbers and symbols in *, #, 0-9.

S402. The CN sends the button signal to the INFO message and sends the message to the AS. The message body of the INFO message contains the content of the button of the user B, *.

The CN is a Core Network (CN), such as an IMS network or an NGN network. In practice, the AS, the MRS, and the UE are connected or anchored to the ISM network or the NGN network.

The INFO message in the step S402 is as follows. It can be understood that the message is only an example, and the present embodiment is not limited.

S403. The AS returns an OK response message of the INFO message to the CN.

S404. User B continues to press a button during a call, such as pressing 7.

S405. The CN sends the button signal to the INFO message and sends the message to the AS. The message body of the INFO message contains the content of the button of the user B, 7.

For the content of the INFO message in step S405, refer to the message content example of step S402, and replace the * content therein with 7.

S406. The AS returns an OK response of the INFO message to the CN.

S407. User B continues to press a button during a call, such as pressing 7.

S408. The CN sends the button signal to an INFO message and sends the message to the AS, where the message body of the INFO message is included. User B's button content, 7.

For the content of the INFO message in step S408, refer to the message content example of step S402, and replace the * content therein with 7.

S409: The AS returns a response 200 OK of the INFO message to the CN. If the AS matches the button number of the user B according to the INFO message and the button feature code *77, the process proceeds to the subsequent process.

Wherein, in S409, the AS recognizes that the button signal input by the user B is other content such as 123#, *78, etc., and does not match the specified button feature code such as *77, then ignores the corresponding INFO message reported, except for the INFO The message is replied to the OK response and no further processing is done.

Referring to FIG. 5, the embodiment further provides a method for implementing call camping, including:

S501. When user A and user B are in a call, user B presses a button during a call, and the core network reports the button signal to the AS through an INFO message.

The user B can be the calling party or the called party, and the button signal can be understood as the DTFM signal corresponding to the button number of the user.

S502. The AS returns a response 200 OK of the INFO message to the call re-initiation terminal of the user B.

S503. The AS matches the button number in the INFO message to the specified service feature code. For example, *77, the AS wants to play the call hold tone to the user A, so the AS sends a REINVITE request to the A, and carries the SDP media information of the MRS.

The SDP media information includes an IP address, a port number, and a media capability such as audio, video, and encoding format, and the like.

S504. The call holding terminal of user A returns a response 200 OK of the REINVITE request to the AS, and carries the SDP media information of the call holding terminal.

S505. The AS sends an ACK acknowledgement message to the call holding terminal of the user A, and controls the media player to put a call hold tone to the call holding terminal.

S506. The AS wants to initiate a call release of the call to the user B, and the tone may be a null tone. Then, the AS sends a REINVITE request to the call camp originating terminal, and carries the SDP media information of the MRS.

S507. The call camping initiation terminal of the user B returns a response 200 OK of the REINVITE request to the AS, and carries the SDP media information of the call resident originating terminal itself.

S508. The AS sends an ACK acknowledgement message to the call camp originating terminal of the user B, and plays a tone to the call camp originating terminal, and the sound content may be a voice.

S509. The user B enters the designated resident service code ac1. After the AS informs the B of the assigned line number, the AS releases B and records the call related information at this time, and sends a BYE request to B.

The call related information of this embodiment includes the assigned line number and the call park originating terminal number.

S510. The call camping initiation terminal returns a response of the BYE request 200 OK, and B ends the call.

At this time, the state is released, and A is kept listening to the call hold tone, realizing the function of the resident part.

S511. The user C sends an INVITE call request message to the AS through the call access terminal, and the call request message carries The button signal of the belt includes the designated call pick-up service code ac2 plus the number of the user B, or ac2 plus the line number LineId obtained by the user B before being released, and the call request message also carries the SDP media information of the call pick-up terminal itself.

S512. The button number in the AS query call request message matches the recorded call related information, controls the media server to stop holding the call alert tone for the A, and wants to associate the call holding terminal with the call pickup terminal, so the AS keeps the call. The terminal sends a REINVITE request carrying the SDP media information of the call pickup terminal, that is, the SDP media information in step 511.

S513. The call holding terminal returns a response 200 OK of the REINVITE to the AS, and carries the SDP media information of the call holding terminal itself.

S514. The AS sends an ACK acknowledgement message to the call holding terminal.

S515. The AS returns a response 200 OK of the INVITE to the call picking terminal, and carries the SDP media information of the call holding terminal, that is, the SDP media information in S513.

S516. The call holding terminal sends an ACK acknowledgement message to the AS. The call holding terminal and the call pickup terminal complete the media negotiation, enter the call state, and realize the function of the connection part.

With the method of implementing the call residing in this embodiment, the call residing can be implemented on the basis of the existing terminal and the network element device, and the terminal can report the key number input by the user to the AS, and the AS according to the input key number and The corresponding relationship of each service controls the terminal involved in the service, and realizes call camping during the call. In the present embodiment, the terminal having the function of sending the refer signal must be used or the terminal having the two-way calling function must be used in the related art. In this embodiment, the existing ordinary terminal can be used to implement call camping, which is advantageous for expanding the market or for sale. The function of the terminal used at the same time makes the method of the embodiment more adaptable and practical, and is beneficial to improving the user experience.

Embodiment 3:

Referring to FIG. 6, the embodiment provides an application server 6 for implementing call residing, comprising: a receiving module 61 and a control module 62;

The receiving module 61 is configured to receive a camping trigger message reported by the call camping initiating terminal in the call, receive a call camp message reported by the call camping initiating terminal, and receive a call request message initiated by the call picking terminal; The camping trigger message is a message generated after the trigger button signal conversion processing of the call camp originating terminal; the call camp message is a message generated according to the resident button signal conversion processing of the call camp originating terminal; the call request message carries Calling the message generated after the dial button signal conversion process of the pick up terminal;

The control module 62 is configured to: when the resident trigger message carries the preset button service feature code, perform media negotiation of the call hold and play service with the call holding terminal in the call, and control the media server to play the call hold tone to the call hold terminal. When the call camp message carries the preset camping service code, the resident call information of the current call is recorded, and the call camp originating terminal is released; when the call request message matches the resident access information, the control media server stops. The call holding terminal plays a call hold tone, and connects the call pickup terminal to the call hold terminal.

In this embodiment, the call camping initiating terminal, the call holding terminal, and the call picking terminal belong to a user equipment (User Equipment, UE), which is a device for the user to initiate a call, answer the call, and perform other call operations, for example, The UE may be a terminal device such as a C network or a G network mobile phone, a PSTN terminal, or an IMS terminal. The call resident originating terminal may be a calling terminal or a called terminal, which is not limited in this embodiment.

The function of the media server in this embodiment is to provide various required voice resources for the terminal in the process of the call park. The media server belongs to a media resource server (MRS) and can provide voice media capabilities, such as The call hold tone and the like are played to the held party user during the call hold process. The information transmission between the MRS and the UE is the transmission of the media stream, and the information such as the decoding format, the transceiver port, and the broadband transmission speed of the media packet between the UE and the MRS needs to be determined according to media negotiation between the UE and the MRS.

The application server AS in this embodiment generally provides the underlying service capabilities, such as call control, status reporting, and bill generation.

When the AS and the UE communicate with each other through the core network using the SIP protocol, the key signals of the call-resident originating terminal and the call-pickup terminal are generally DTMF signals, and need to be converted by the core network to generate an AS-identifiable SIP-compliant message, generally INFO message. Of course, in addition to the INFO message, the button signal of the call-resident originating terminal and the call-carrying terminal can also be converted into a message identifiable by other ASs, and can even be reported to the AS in other manners without passing through the core network. This is not limited.

In summary, the resident trigger message, the call camp message, and the call request message received by the receiving module 61 are all INFO messages, and are generated by the core network based on the terminal trigger button signal, the resident button signal, and the dial button signal respectively. INFO message.

It can be understood that the trigger button signal, the resident button signal, and the dial button signal are all converted into DTMF signals according to the button number input by the user. The response is the corresponding key code entered by the user.

In this embodiment, after the call camping initiation terminal reports the camping trigger message, the control module 62 controls the media server to play the call holding prompt tone to the call holding terminal according to the camping trigger message, prompting the user to be in the call state, and avoiding The user hangs up. At this time, the user can input a button signal on the call camping initiation terminal to determine whether the call camp originating terminal restores the current call or completely quits the current call. In this embodiment, the button numbers corresponding to the button signals include, but are not limited to, combinations of numbers such as *, #, 0-9.

Generally, different service codes (corresponding to the key numbers input by the user keys) can be specified for different services, and the length and composition of the service codes can be arbitrarily set, for example, setting *77 as a button corresponding to the triggered resident service. The service signature; the *81 is set as the resident service code, and is used to trigger the AS to release the call-resident originating terminal, and the *83 is set as the call pick-up service code, which is used to trigger the call pick-up service, that is, in the second embodiment. Continue the business.

When user B triggers a button during the conversation with user A, and enters button number *77, the resident service is triggered. The control module 62 controls the media server to play a call hold tone for the call holding terminal, and plays a call to the call camping terminal. At this time, the play may be a mute or a preset tone.

In this embodiment, the resident access information recorded by the control module 62 can be used to identify the current call, and distinguish the call from other calls. Considering that in a certain call, the number of the two parties is unique, in this embodiment, the control module 62 can use the call holding terminal number and/or the call park originating terminal number as the identity call holding terminal and the call camping initiation. Resident access information for the call of the terminal. In addition, since the AS is the main control unit for controlling the current call and globally controls each current call, the AS can assign the call holding terminal a identification information that uniquely identifies the call, and the control module 62 records the identification information as the resident. Leave access information. In addition to the call holding terminal number and/or the call camping initiating terminal number mentioned above and the identification information assigned by the AS, the embodiment may also use other information that can identify the call of the call holding terminal as the resident access information.

Further, the application server of this embodiment may further include a notification module 63, configured to notify the call camping initiating terminal of the camping access information, and then call the camping initiating terminal, before the control module releases the call camping initiating terminal. The user can notify the user of the call picking terminal by means of verbal notification, telephone, mail or short message.

Alternatively, the notification module 63 is configured to: when the receiving module 61 receives the number of the call picking terminal reported by the call camping initiating terminal before the control module 62 releases the call camping initiating terminal, according to the number of the call picking terminal The call pickup terminal informs the resident access information.

In the present embodiment, the camping access information of the present embodiment includes at least one of a call camping originating terminal number and a line number assigned to the camping service in order to accurately pick up the call by the call pickup terminal. It can be understood that the line numbers corresponding to different parking calls are different.

When the camping access information includes only the call camping originating terminal number, the control module 62 may notify the call camping initiating terminal that the camping access information may be omitted before releasing the call camping initiating terminal, directly by the call camping. The initiating terminal informs the call picking terminal of its number.

When the resident access information is different, the call request reported by the corresponding call pickup terminal is also different. When the camping access information includes the resident originating terminal number, the button signal carried by the call request message includes a call picking service code plus a call camping originating terminal number; when the camping access information includes a line number allocated for the camping service The button signal carried by the call request message includes a call picking service code plus a line number; when the camping access information includes a call camping originating terminal number and a line number allocated for the camping service, the button signal carried by the call request message Including the call pick-up service code plus the call-resident originating terminal number, or the call pick-up service code plus line number.

In this embodiment, when the user picking up the pick-up terminal uses the method of dialing the pick-up service code plus the call-resident originating terminal number to pick up the call with the call-holding terminal, the line number does not need to be known, that is, no control is needed. Module 62 informs the call park originating terminal or the call pick up terminal of the line number. At this time, for security reasons, certain protection measures are needed to make a security judgment on the connection of the call pickup terminal, so as to prevent others from posing as a connection or a malicious connection.

In view of this, the application server of this embodiment further includes a security verification module 64 for carrying the call request message. When the button signal includes the call pick-up service code plus the call-resident originating terminal number, before the call of the call pick-up terminal and the call-holding terminal is connected, the call pick-up terminal is authenticated by the call pick-up authority according to a preset verification manner. . If the call picking terminal has the call picking right, the call between the call picking terminal and the call holding terminal is turned on.

There are many preset verification methods used by the security verification module 64, for example, pre-acquiring the user white list of the call resident originating terminal, and determining whether the call pickup terminal has a call pickup according to whether the number of the call pickup terminal is in the user white list. For example, the privilege password is set in advance, and after the call picking terminal initiates the call request message, the prompt tone of the input privilege password is played, prompting the user of the call picking terminal to report the privilege password, according to the reported password and the preset password. Matching or not determines whether the call picking terminal has the call picking right, and the user can report the authority password by means of a button or voice.

After the verification of the security verification module 64 is passed, the call of the call pickup terminal and the call holding terminal can be connected. For the process of connecting the call pickup terminal and the call holding terminal, refer to the related description of the second embodiment.

Referring to FIG. 7, the embodiment further provides a system for implementing call park, including a media server 71 and the application server 6 described above in this embodiment;

The application server 6 and the media server 71 perform media negotiation of the resident service, and the media server is configured to send the media stream to the terminal corresponding to the resident service according to the media negotiation performed by the application server and the terminal corresponding to the resident service.

After the receiving module receives the resident trigger message, the control module can control the media server to play the hold tone for the call holding terminal to prevent the user from hanging up, and the receiving module receives the resident trigger. After the message, the control module releases the call resident originating terminal, and records the resident access information. When the button number in the call request message received by the receiving module matches the resident access information, the control module connects the call holding terminal and the reported call. The call requesting the message picks up the call between the terminals and is implemented during the call. The application server of the embodiment implements the call residing between the existing terminals by using the foregoing mechanism. In the related art, the terminal of the call must be a SIP advanced terminal or a two-way call function, and the application of this embodiment is adopted. The server can implement call park without modifying the terminal. It has better adaptability, which is conducive to expanding the application's extensiveness. At the same time, it also saves the cost of deployment and is more practical, which is beneficial to enhance the user experience.

Obviously, those skilled in the art should understand that the above modules or steps of the present disclosure can be implemented by a general computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in a storage medium (ROM/RAM, diskette, optical disk) by a computing device, and in some cases The steps shown or described may be performed in an order different than that herein, or they may be separately fabricated into individual integrated circuit modules, or a plurality of the modules or steps may be implemented as a single integrated circuit module. Therefore, the present disclosure is not limited to any specific combination of hardware and software.

The above content is a further detailed description of the present disclosure in conjunction with the specific embodiments, and the specific implementation of the present disclosure is not limited to the description. It is to be understood by those skilled in the art that the present invention may be construed as being limited to the scope of the present disclosure.

Industrial applicability

The method for implementing call camping provided by the embodiment of the present disclosure can control the media server to play a call hold tone to the call holding terminal after receiving the camping trigger message reported by the call camping initiating terminal, prompting the user not to hang up, and thereafter, when When the call residing message reported by the initiating terminal in the call carries the preset resident service code, the resident access information may be recorded, and then the call camping initiating terminal is released, and the subsequent connection process is performed: receiving the call The call request message initiated by the terminal is picked up, and when the call request message matches the resident access information, the control media server stops playing the call hold tone to the call holding terminal, and connects the call pickup terminal to the call hold terminal. Through the above mechanism, the terminal in the embodiment of the present disclosure can implement call camping by using the existing common terminal, thereby reducing the demand for the call resident to the terminal, improving the utilization of the existing terminal, and reducing the call camping. The cost of the business enhances the user's experience and is more practical.

Claims

A method of implementing call park, comprising:

Receiving a call in the call to camp on the resident triggering message reported by the initiating terminal;

When the camping trigger message carries the preset button service feature code, the call holding terminal in the call performs media negotiation of the call hold and play service, and controls the media server to play the call hold prompt tone to the call holding terminal;

Receiving a call in the call to camp on the call park message reported by the originating terminal;

When the call camp message carries a preset resident service code, record the resident access information of the current call, and release the call resident originating terminal;

Receiving a call request message initiated by the call picking up terminal, where the call request message carries a message generated by the dial button signal conversion process of the call picking terminal;

When the call request message matches the resident access information, the control media server stops playing the call hold tone to the service hold terminal, and connects the call pickup terminal to the call hold terminal.
The method for implementing call camping according to claim 1, wherein the camp-resident initiating terminal is informed of the resident access information before releasing the call-resident originating terminal;

Or, if the number of the call picking terminal reported by the call camping initiating terminal is received before the call camping initiating terminal is released, picking up the call according to the number of the call picking terminal The terminal informs the resident access information.
The method for implementing call camping according to claim 1 or 2, wherein said resident access information comprises at least one of a call park originating terminal number and a line number assigned for camped service;

When the resident access information includes the resident originating terminal number, the dialing button signal carried by the call request message includes a call picking service code and the call camping originating terminal number;

When the resident access information includes a line number allocated for the resident service, the dialing button signal carried by the call request message includes a call picking service code plus the line number;

When the resident access information includes a call camping originating terminal number and a line number allocated for the camping service, the dialing button signal carried by the call request message includes a call picking service code and the call camping originating terminal. The number, or call pick up service code plus the line number.
The method for implementing call park according to claim 3, wherein said call is turned on when said dialing button signal carried by said call request message includes said call picking service code plus call park originating terminal number Before picking up the call between the terminal and the call holding terminal, the method further includes performing call picking authority verification on the call picking terminal according to a preset verification manner.
The method for implementing call camping according to claim 1 or 2, wherein said camping trigger message, call park message and call request message are session initial protocol information messages, and said session initial protocol information message is a core The network will trigger the message generated by the button signal, the resident button signal and the dial button signal.
A method of implementing call parking according to claim 5, wherein said session initial protocol information is eliminated The message is a message generated after the conversion of the key signal, and further includes: combining the session initial protocol information messages converted by the key signals, and parsing the merged session initial protocol information message.
An application server that implements call parking, including:

a receiving module, configured to receive a camping trigger message reported by the call camping initiating terminal in the call, receive a call camp message reported by the call initiating terminal in the call, and receive a call request message initiated by the call picking terminal; The call request message carries a message generated by the dial button signal conversion process of the call picking terminal;

The control module is configured to: when the camping trigger message carries the preset button service feature code, perform media negotiation with the call holding terminal in the call to maintain the playback service, and control the media server to prompt the call holding terminal to play the call. When the call camp message carries a preset camping service code, recording the camping access information of the current call, releasing the call camping originating terminal; when the call request message is connected to the camping When the incoming information matches, the control media server stops playing the call hold tone for the service hold terminal, and connects the call pickup terminal to the call hold terminal.
The application server for implementing call park according to claim 7, further comprising a notification module, configured to notify the call resident originating terminal of the call before the control module releases the call camp originating terminal Residing access information;

Alternatively, if the receiving module receives the number of the call picking terminal reported by the call camping initiating terminal before receiving the call camping initiating terminal, the receiving module is configured to pick up the terminal according to the call. The number informs the call pickup terminal of the resident access information.
The call server-resident application server according to claim 7 or 8, wherein the resident access information acquired by the control module includes a call camp originating terminal number and a line number allocated for the resident service. At least one;

When the resident access information includes the resident originating terminal number, the dialing button signal carried by the call request message includes a call picking service code and the call camping originating terminal number;

When the resident access information includes a line number allocated for the resident service, the dialing button signal carried by the call request message includes a call picking service code plus the line number;

When the resident access information includes a call camping originating terminal number and a line number allocated for the camping service, the dialing button signal carried by the call request message includes a call picking service code and the call camping originating terminal. The number, or call pick up service code plus the line number.
The application server for implementing call park according to claim 9, further comprising a security verification module, configured to: when the call request message is carried, the dialing button signal comprises the call picking service code plus a call camping originating terminal In the case of the number, before the control module turns on the call between the call picking terminal and the call holding terminal, the call picking terminal performs call picking authority verification according to a preset verification manner.
A system for implementing call park, comprising: a media server and an application server according to claims 7-10; the application server and the media server perform media negotiation of a resident service, the media server setting Corresponding to the resident service according to the media negotiation performed by the application server and the terminal corresponding to the resident service The terminal sends a media stream.
A storage medium for storing program code for performing the method of implementing call parking according to any one of claims 1 to 6.