CN1859482A - Method and system for providing real time audible ringing tone - Google Patents

Abstract

Translated fromChinese

本发明公开了一种在通信网络中提供实时回铃音的方法，包括以下步骤：被叫终端收到网络侧发来的主叫终端的呼叫请求；被叫终端可向网络侧发送回铃音标识；网络侧的回铃音单元根据回铃音标识存储有大量的回铃音数据，于是可根据接收到的回铃音标识寻到对应的回铃音，并实时地播放给主叫终端。本发明还提供了一种在通信网络中提供实时回铃音的系统。利用本发明的技术，被叫用户可根据当时情况实时地发送不同的回铃音标识，从而达到向主叫播放不同回铃音的目的，这在充分满足用户的个性化需求的同时，也进一步提升通信服务质量。

The invention discloses a method for providing a real-time ring-back tone in a communication network, comprising the following steps: a called terminal receives a call request from a calling terminal sent from a network side; the called terminal can send a ring-back tone to the network side Identification; the ring-back tone unit on the network side stores a large amount of ring-back tone data according to the ring-back tone identification, so the corresponding ring-back tone can be found according to the received ring-back tone identification, and played to the calling terminal in real time. The invention also provides a system for providing real-time ring back tone in the communication network. Utilize the technology of the present invention, the called user can send different ring-back tone identifications in real time according to the situation at that time, so as to achieve the purpose of playing different ring-back tones to the calling party. Improve communication service quality.

Description

A kind of method and system that real-time ring back tone is provided

Technical field

The bell sound that the present invention relates in a kind of communication network provides technology, is specifically related to a kind of method and system thereof that ring-back tone is provided in communication network.

Background technology

In existing communication network, no matter be fixed communication network, global mobile communication (GSM) network or code division multiple access (CDMA) mobile communications network, receive a calling subscriber incoming call as the called subscriber after, the called subscriber can select to answer, and also can select not answer even refuse (user can by refuse by on-hook key incoming call).Because we run into this situation through regular meeting: it is extremely busy just to catch up with the called subscriber when incoming call arrives, and for example, is busy with answering the important phone of another one, perhaps is busy with handling an important thing, perhaps just in session.At this moment, the called subscriber generally adopts the rejection mode, plays " phone that you dial temporarily can't be connected " by the called switching center of prior art to the calling subscriber, or unalterable prompt tones such as " user that you dialed converse ".

If the calling subscriber runs into this situation first, he may really think as prompt tone prompting, and the called subscriber can't connect or converse with others.But people can know in the course of time, and the appearance of this prompt tone be exactly that the called subscriber refuses to answer to cause in fact, moreover before called subscriber's refusal was answered, caller can be heard the called ring-back tone that is in alerted.In fact, refusal is answered electricity and can be considered to unhandsome, often has influence on the emotion between the caller and called users, makes an explanation even the called subscriber calls back the calling subscriber afterwards, still can be owing to the untimely effect that causes is undesirable.

In addition, the technical scheme that also has the customization ring-back tone in the prior art, promptly generally by behind the signatory audible ringing tone service of called subscriber, when calling terminal is called out this terminal called and terminal called is in idle condition, then send ring-back tone to calling terminal by called subscriber's customization by ringback tone server RBTS.Here, the called subscriber can formulate different ring-back tones according to the personal preference or according to calling number or according to the time, thereby satisfies user's individual demand to a certain extent.But these ring-back tones all customize in advance, and can't send different ring-back tones in real time according to actual conditions at that time to satisfy terminal use's demand neatly.

In summary, described existing bell sound provides technology, can not provide different ring-back tones in real time according to actual conditions, can't satisfy user's requirement higher to communication service, and then in the development that has to a certain degree still limited communication service.

Summary of the invention

In view of this, first purpose of the present invention is to provide a kind of method that real-time ring back tone is provided in communication network, makes the called subscriber to send different ring-back tones in real time according to situation at that time.

Second purpose of the present invention is to provide a kind of system that real-time ring back tone is provided.

In order to achieve the above object, the invention provides a kind of method that real-time ring back tone is provided in communication network, it is characterized in that, may further comprise the steps:

A. terminal called is received the call request of the calling terminal of network side transmitted;

B. terminal called sends audible ringing tone mark to network side;

C. the ring-back tone of correspondence is sought according to this audible ringing tone mark in the ring-back tone unit of network side, and plays to calling terminal in real time.

Before the described steps A of this method, preserve corresponding ring-back tone according to audible ringing tone mark in the ring-back tone unit.

In the method, when described audible ringing tone mark was empty, corresponding was acquiescence ring-back tone or the traditional ringback sound that is provided with.

Before the described steps A of this method, terminal called carries out the signatory of real-time ring back tone business at network side, and CAMEL-Subscription-Information is kept among the attaching position register HLR of terminal called; Described steps A comprises: calling terminal is by caller switching center request call terminal called; Caller switching center asks and obtains this CAMEL-Subscription-Information and the routing iinformation of this terminal called to the attaching position register HLR of terminal called; Caller switching center sends to terminal called with this call request by called switching center.

In the method, described ring-back tone unit is set in called switching center or the caller switching center; Perhaps

Described ring-back tone unit is independent ringback tone server RBTS.

Among the described step B of this method, fixedly terminal called passes through the DTMF mode, and audible ringing tone mark is sent to called switching center, and this called switching center sends to the ring-back tone unit directly or indirectly with this audible ringing tone mark again.

Among the described step B of this method, mobile called terminal sends to called switching center by Start DTMF message one or many with audible ringing tone mark, and this called switching center sends to the ring-back tone unit directly or indirectly with this audible ringing tone mark again.

Among the described step B of this method, terminal called passes through User-to-User Signaling UUS or disconnection message Disconnect or response message Connect and sends audible ringing tone mark to called switching center, and this called switching center sends to the ring-back tone unit directly or indirectly with this audible ringing tone mark again.

In the method, called switching center is imported and sent to described audible ringing tone mark by the called subscriber by terminal called; Perhaps set in advance the corresponding corresponding audible ringing tone mark of predetermined state at terminal called, terminal called is determined corresponding audible ringing tone mark according to current SOT state of termination, and sends this audible ringing tone mark automatically to called switching center.

In the method, after described audible ringing tone mark sent to called switching center, called switching center disconnected or does not disconnect and being connected of terminal called.

Before the described step B of this method, when called switching center also confiscates audible ringing tone mark, play the acquiescence ring-back tone of setting or the traditional ringback sound of system by caller switching center and/or called switching center notice ring-back tone unit;

After audible ringing tone mark is received by called switching center, carry out described step C, comprising:

C11. in called switching center this audible ringing tone mark is sent to the ring-back tone unit directly or indirectly, the real-time ring back tone of correspondence is sought in the ring-back tone unit according to this audible ringing tone mark;

C12. the ring-back tone unit stops to play described acquiescence ring-back tone or traditional ringback sound, and plays this real-time ring back tone to calling terminal.

Before the described step B of this method, called switching center knows that terminal called is in the idle condition predetermined amount of time afterwards, called switching center and/or caller switching center judge whether that earlier terminal called has sent audible ringing tone mark, and temporarily do not play any ring-back tone to calling terminal; If then execution in step C of audible ringing tone mark receives in called switching center in the predetermined amount of time, otherwise the acquiescence ring-back tone of setting is play in notice ring-back tone unit or the traditional ringback sound of system is given calling terminal; Described step C comprises:

C21. in called switching center this audible ringing tone mark is sent to the ring-back tone unit directly or indirectly, the real-time ring back tone of correspondence is sought in the ring-back tone unit according to this audible ringing tone mark;

C22. this real-time ring back tone is play to calling terminal in the ring-back tone unit.

In the method, if described acquiescence ring-back tone is play in the ring-back tone unit or the traditional ringback sound reaches predetermined amount of time: and terminal called does not send audible ringing tone mark or still dont answer or calling terminal on-hook not yet of terminal called yet; Then stop playing RBT, and end call connects by caller switching center and/or called switching center notice ring-back tone unit.

Play among the described step C of this method after the real-time ring back tone,

When the calling terminal on-hook, then stop to play real-time ring back tone, and end call connects by caller switching center and/or called switching center notice ring-back tone unit; Perhaps

When terminal called is replied, then stop to play real-time ring back tone, and connect the speech channel of calling and called terminal by caller switching center and/or called switching center notice ring-back tone unit; Perhaps

After the real-time ring back tone of predetermined amount of time is play in the ring-back tone unit, then stop to play real-time ring back tone, and end call connects by caller switching center and/or called switching center notice ring-back tone unit.

The present invention also provides a kind of system that real-time ring back tone is provided in communication network, comprise caller switching center, called switching center, attaching position register, and further comprise:

The ring-back tone unit, it is used for storage and plays real-time ring back tone;

When terminal called receives the call request of calling terminal, terminal called sends audible ringing tone mark to called switching center, and called switching center sends to the ring-back tone unit with this audible ringing tone mark directly or indirectly, and the ring-back tone unit is sought the ring-back tone of correspondence and played to calling terminal in real time according to this audible ringing tone mark.

In the native system, described ring-back tone unit is set in the called switching center or in the caller switching center; Perhaps

Described ring-back tone unit is independent ringback tone server RBTS.

In the native system, corresponding ring-back tone is also preserved according to audible ringing tone mark in described ring-back tone unit; The real-time ring back tone of correspondence is sought after receiving the audible ringing tone mark that terminal called sends in the ring-back tone unit by this audible ringing tone mark.

In the native system, fixedly terminal called sends to called switching center by the DTMF mode with audible ringing tone mark; Perhaps

Mobile called terminal sends to called switching center by Start DTMF message with audible ringing tone mark.

In the native system, terminal called passes through User-to-User Signaling UUS or disconnection message Disconnect or response message Connect and sends audible ringing tone mark to called switching center.

In the native system, called switching center is imported and sent to described audible ringing tone mark by the called subscriber at terminal called; Perhaps set in advance the corresponding corresponding audible ringing tone mark of predetermined state at terminal called, terminal called is determined corresponding audible ringing tone mark according to current SOT state of termination, and sends this audible ringing tone mark automatically to called switching center.

In the native system, after the audible ringing tone mark of terminal called was received by described called switching center, called switching center disconnected or does not disconnect and being connected of terminal called.

By technical scheme of the present invention, can send audible ringing tone mark during call request that terminal called is received calling terminal, and the ring-back tone unit sends ring-back tone to terminal called in real time according to this audible ringing tone mark.Thereby the called subscriber can send different ring-back tones to calling terminal in real time according to situation at that time, has fully satisfied user's individual demand, and has further promoted telecommunication service quality.Such as the called subscriber can with the reason of rejection for some reason in time, reasonably send to the calling subscriber, to avoid misunderstanding each other by real-time ring back tone; And the called subscriber can express mood, state etc. at that time to the calling subscriber by real-time ring back tone.

Description of drawings

Figure 1A is the system configuration sketch of embodiments of the invention one.

Figure 1B is the signaling process figure of embodiments of the invention one.

Fig. 2 A is the system configuration sketch of embodiments of the invention two.

Fig. 2 B is the signaling process figure of embodiments of the invention two.

Fig. 3 A is the system configuration sketch of embodiments of the invention three.

Fig. 3 B is the signaling process figure of embodiments of the invention three.

Fig. 4 A～Fig. 4 B is the signaling process figure of embodiments of the invention four.

Fig. 5 is the signaling process figure of embodiments of the invention five.

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.

Basic fundamental thought of the present invention is: when terminal called is received the incoming call request of calling terminal, terminal called can send an audible ringing tone mark to network side, and the ring-back tone unit of network side sends corresponding ring-back tone to calling terminal in real time according to this audible ringing tone mark.

For the real-time ring back tone business, the called subscriber can pass through to the signatory mode in business hall and carry out the registration of real-time ring back tone business, also can be by dialing special number or carrying out the registration of this business by the mode of Internet.

In order to realize the real-time ring back tone business, preserve corresponding ring-back tone according to audible ringing tone mark in the ring-back tone unit, as shown in table 1:

Audible ringing tone mark	Ring-back tone
		1	Real-time ring back tone 1
2	Real-time ring back tone 2
		3	Real-time ring back tone 3
4	Real-time ring back tone 4
		5	Real-time ring back tone 5

Table 1

If terminal called does not send or sends audible ringing tone mark when invalid, be that audible ringing tone mark is empty (NULL), the acquiescence ring-back tone that corresponding is is provided with or the traditional ringback sound of system, can send acquiescence ring-back tone or traditional ringback sound to calling terminal this moment by the ring-back tone unit.

The acquiescence ring-back tone is to be provided with at all calling terminals, at this moment, and for all only corresponding same ring-back tone of any calling terminal; The acquiescence ring-back tone also can be only to be provided with at indivedual calling terminals, at this moment, can set up a caller-acquiescence ring-back tone correspondence table according to calling identification, and is as shown in table 2.In the table, calling terminal identification is calling subscriber's a communicating number (MSISDN).Like this, will determine the real-time ring back tone of acquiescence according to calling terminal identification at RBTS.

Calling identification	The acquiescence audible ringing tone mark
		13923812345	1
13923812345	2
		13923812345	3
13323622336	1
		13323622336	2
13323622336	3
		82882233	1
82882233	2
		82882233	3

Table 2

The acquiescence ring-back tone is to be provided with at all terminal calleds, at this moment, and for all only corresponding same ring-back tone of any terminal called; The acquiescence ring-back tone also can be only to be provided with at indivedual terminal calleds, at this moment, can set up a called-acquiescence ring-back tone correspondence table according to called identification, and is as shown in table 3.In the table, the terminal called sign is called subscriber's a communicating number (MSISDN).Like this, will determine the real-time ring back tone of acquiescence according to the terminal called sign at RBTS.

Called identification	The acquiescence audible ringing tone mark
		13923812345	1
13923812345	2
		13923812345	3
13323622336	1
		13323622336	2
13323622336	3
		82882233	1
82882233	2
		82882233	3

Table 3

And if terminal called has sent audible ringing tone mark, then play corresponding real-time ring back tone according to this audible ringing tone mark, as the real-time ring back tone in the table 1 1～5, can have the corresponding voice suggestion content about the rejection reason in these real-time ring back tones, for example real-time ring back tone 1 has " user that you dialed just in session " etc.Certainly, all real-time ring back tones not only have the voice suggestion content, can also be voice suggestion, music, song, video display and/or dialogue or the like, its objective is that the called subscriber is when refusing to receive telephone, can also be in time, reasonably explain the reason that can't answer to the calling subscriber, thereby avoided takeing in a wrong spirit or estrangement between calling subscriber and the called subscriber.

In fact, also can be in non-refusing to receive telephone, send audible ringing tone mark and play real-time ring back tone, as between friend, expressing situation at that time in real time,, thereby satisfy customer personalized demand more neatly as mood etc., increase customer satisfaction degree.

Real-time ring back tone of the present invention can be provided or the user uploads by provider, and be stored in the ring-back tone unit, this ring-back tone unit can be independent ringback tone server RBTS, perhaps be located among the MSC of switching center, this ring-back tone unit stores the ring-back tone data of real-time ring back tone sign representative.When the audible ringing tone mark of terminal called is received in this ring-back tone unit, find corresponding real-time ring back tone and send to calling terminal according to this audible ringing tone mark.

In the middle of the reality, the called subscriber can also be according to own different time sections of living in, and automatic or manual transmits different audible ringing tone marks to network side.For example, after 10 of nights, terminal called can feed back an audible ringing tone mark automatically; Normal working hours, terminal called can feed back the another one audible ringing tone mark automatically; On Sunday, terminal called can feed back another different audible ringing tone mark automatically.If the user is answering a phone, also can be by audible ringing tone mark of user's manual feedback, the ring-back tone that changes the audible ringing tone mark correspondence can be to represent the voice suggestion of answering the call.As seen audible ringing tone mark can be according to time, place, personage, incident, mood etc. and is different.

The present invention also provides a kind of terminal called to send the technical scheme of audible ringing tone mark to the called T_MSC of switching center.Here, need on terminal called Called, O_MSC (caller switching center) and/or T_MSC (called switching center), carry out suitable transformation: for example in T_MSC, start the function that collects the digits (existing MSC has forbidden the function that collects the digits at dialing phase) of dialing phase, in the terminal called storage be provided for obtaining and send the application program etc. of audible ringing tone mark.Below how explanation sends to two kinds of methods of network side with audible ringing tone mark, but is not limited thereto.

First kind of scheme sends audible ringing tone mark by the DTMF mode.

A), operate as follows for fixed terminal:

1, terminal called directly sends audible ringing tone mark to T_MSC by the DTMF mode, situation for manual transmission audible ringing tone mark, as audible ringing tone mark is 1 o'clock, can audible ringing tone mark can be sent by " 1 " key that hits on the Telephone set,, acknowledgement key can be required to append certainly for fear of misoperation, as " # " key, promptly need to send audible ringing tone mark, promptly earlier by " 1 " key that hits on the terminal called, again by " # " key by hitting " 1# ".

2, after T_MSC receives the character of certain-length (for example long 2 number lengths) by the parsing dtmf signal, send this audible ringing tone mark that obtains to the ring-back tone unit.

B), operate as follows for portable terminal:

1, terminal called sends a character of audible ringing tone mark to T_MSC by Start DTMF message, situation for manual transmission audible ringing tone mark, a character as audible ringing tone mark is 2 o'clock, can be by hitting the character that " 2 " key on the Telephone set can send audible ringing tone mark.Equally,, can require to append acknowledgement key,, promptly need to send audible ringing tone mark 2 by hitting " 2# " as " # " key certainly for fear of misoperation.

2, after terminal called receives the DTMF Ack that T_MSC returns, send a Stop DTMF to this end office (EO);

3, terminal called sends a character of audible ringing tone mark by Start DTMF to T_MSC again, receive the DTMF Ack that called end office returns after, send a Stop DTMF to this end office (EO), up to whole audible ringing tone marks are sent to T_MSC.Certainly, the form of the character that called mobile terminal also can be by the some length of the disposable transmission of StartDTMF sends audible ringing tone mark.

Second kind of scheme sends audible ringing tone mark by UUS (User to User Singal) signaling or Disconnect message:

The Disconnect message content is as follows: 3GPP TS 24.008:DISCONNECT messagecontent (mobile station to network direction)

IEI	Information?element	Type/Reference	Presence	Format	Length
							Call?control protocol?discriminator	Protocol?discriminator 10.2	M ?	V ?	1/2 ?
	Transaction?identifier ?	Transaction?identifier 10.3.2	M ?	V ?	1/2 ?
							Disconnect message?type	Message?type 10.4	M ?	V ?	1 ?
	Cause ?	Cause 10.5.4.11	M ?	LV ?	3-31 ?
						1C ?	Facility ?	Facility 10.5.4.15	O ?	TLV ?	2-？ ?
7E ?	User-user ?	User-user 10.5.4.25	O ?	TLV ?	3-131 ?
						7F ?	SS?version ?	SS?version?indicator 10.5.4.24	O ?	TLV ?	2-3 ?

Terminal called is by some cell in Disconnect message, and for example on behalf of the command code of audible ringing tone mark, User-user cell or Facility cell can will send T_MSC to, and T_MSC obtains corresponding audible ringing tone mark by resolving above cell.

Certainly, terminal called also can be by some cell in the response message, sends the audible ringing tone mark information of correspondence to T_MSC.For example, terminal called also can send to called switching center with audible ringing tone mark by Connect message.

The Connect message content is as follows: 3GPP TS 24.008:CONNECT message content (mobilestation to network direction)

IEI	Information?element	Type/Reference	Presence	Format	Length
							Call?control protocol?discriminator	Protocol?discriminator 10.2	M ?	V ?	1/2 ?
	Transaction?identifier ?	Transaction?identifier 10.3.2	M ?	V ?	1/2 ?
							Connect message?type	Message?type 10.4	M ?	V ?	1 ?
1C ?	Facility ?	Facility 10.5.4.15	O ?	TLV ?	2-？ ?
						4D ?	Connected?subaddress ?	Connected?subaddress 10.5.4.14	O ?	TLV ?	2-23 ?
7E ?	User-user ?	User-user 10.5.4.25	O ?	TLV ?	3-131 ?
						7F ?	SS?version ?	SS?version?indicator 10.5.4.24	O ?	TLV ?	2-3 ?
2D ?	Stream?Identifier ?	Stream?Identifier 10.5.4.28	O ?	TLV ?	3 ?

Terminal called is by some cell in Cconnect message, and for example on behalf of the command code of audible ringing tone mark, User-user cell or Facility cell can will send T_MSC to, and T_MSC obtains corresponding audible ringing tone mark by resolving above cell.

In fact, to obtain audible ringing tone mark can be to import and obtain by the prompting user to terminal called; Also can be to set in advance the corresponding corresponding audible ringing tone mark of predetermined state at terminal called, terminal called be determined corresponding audible ringing tone mark according to current SOT state of termination; Also can be to obtain by the process that the incoming call incident is triggered.For example, the example of prompting user input when terminal is received an incoming call: terminal called is when receiving an incoming call, eject a dialog box, allow the called subscriber import an audible ringing tone mark, show that perhaps a ring-back tone tabulation is for user's selection, and after the user selects corresponding ring-back tone, obtain corresponding audible ringing tone mark; Or the called subscriber opens a dialog box by pre-setting menu when incoming call arrives, and by audible ringing tone mark of this dialog box input, perhaps points out the user to select a ring-back tone from a ring-back tone tabulation.Example according to SOT state of termination: SOT state of termination or pattern that terminal called can set in advance according to the user, return a audible ringing tone mark to network side corresponding to this pattern.For example, the user just in session, terminal can be arranged to conference model, and set in advance under this pattern corresponding audible ringing tone mark, in this case, after terminal called received an incoming call, the audible ringing tone mark with meeting pattern correspondence sent to network side automatically, manually imports audible ringing tone mark and need not the called subscriber; Also for example, terminal called is set in the morning before 8,10 of nights are later on a state, and corresponding audible ringing tone mark 18, like this, terminal is in the morning before 8, after 10 of nights, receiving incoming call is, automatically obtain audible ringing tone mark 18, and the ring-back tone of this audible ringing tone mark correspondence can be: " the automatic You are prompted with of terminal called: the called subscriber is having a rest, if there is not the thing of particular importance; ask contact in second day, thanks! ".

With specific embodiment system and method for the present invention is described below.

Figure 1A is the system configuration sketch of the embodiment of the invention one, and this system not only comprises the HLR of O MSC, T_MSC, terminal called, further comprises the ringback tone server RBTS that is used to preserve with playing RBT.What present embodiment adopted is the GSM network, and its basic thought can be applied to cdma system or fixed communication network system easily, and its difference only is the difference of concrete message.

The MSC here mainly finishes Service Switching Function and CCF, and O_MSC wherein is calling subscriber's MSC or a GMSC (gateway mobile switching center) (GMSC); T_MSC is called subscriber's a visited MSC, mainly preserves called subscriber's current information, and is accomplished to continuing between the called subscriber in calling procedure.HLR mainly preserves the essential information of portable terminal, comprises real-time ring back tone service profile or the like.

Figure 1B is the signaling process figure of the embodiment of the invention one.

Step 101, when O_MSC receives phone call request from calling terminal, send the request SRI of the routing iinformation that obtains the called subscriber to the HLR of called subscriber ownership, this request comprises called subscriber's information such as called number, the MSISDN that the called number here is just called.

Step 102～103, HLR learns that according to called number this called subscriber is real-time ring back tone service contracting user; And HLR sends the request of obtaining called roaming number to T_MSC, and T_MSC sends to HLR with MSRN then for the called subscriber distributes a roaming number MSRN.

Step 104, HLR sends to O_MSC by SRI_Ack message with called MSRN and real-time ring back tone service profile.

Step 105, O_MSC sends an initial address message IAM to T_MSC.The IAM here comprises calling number, called number and called MS RN.

Step 106～108, T_MSC sends to terminal called Called with this IAM; The T_MSC paging is called, and when terminal called is in idle condition, called state information is sent to O_MSC by Address Complete Message ACM (Address Complete Message); If the current state of terminal called is not idle, for example busy, shutdown or out of reach, then T_MSC by O_MSC to the calling terminal transparent transmission represent that the user is busy, the voice suggestion of shutdown or out of reach.

Step 109, O_MSC sends IAM to RBTS, and by this IAM information such as calling number, called number is sent to RBTS, and visible present embodiment one comes the controls playing ring-back tone by O_MSC.

In step 110, RBTS obtains the acquiescence ring-back tone, sends ACM to O_MSC then.Here, when terminal called did not also send audible ringing tone mark, O_MSC notice RBTS earlier sent the acquiescence ring-back tone, pairing ring-back tone when promptly audible ringing tone mark is empty.When the acquiescence ring-back tone is when being provided with according to called number, RBTS can be an acquiescence ring-back tone of searching called subscriber's customization according to this called number.

Step 111, RBTS plays this acquiescence ring-back tone by O_MSC to calling terminal, the traditional ringback sound that the T_MSC of O_MSC shielding simultaneously plays.

Step 112, terminal called are obtained an audible ringing tone mark and are sent this audible ringing tone mark to T_MSC, and being connected of general automatic disconnection of T_MSC here and terminal called, promptly terminal called is no longer by ringring prompting; Can certainly not automatic disconnection and being connected of terminal called, but disconnect being connected of terminal called and T_MSC by on-hook key by the called subscriber, perhaps realize that by answering key the speech channel of calling and called connects, and promptly handles according to existing procedure.It can be to obtain by prompting called subscriber input that terminal called obtains audible ringing tone mark, also can be the audible ringing tone mark of basis at the correspondence of terminal current state or pattern of living in setting, is obtained automatically by terminal.

Step 113～114, T_MSC sends to O_MSC with this audible ringing tone mark; O_MSC sends to RBTS with audible ringing tone mark again.

Step 115, RBTS searches corresponding real-time ring back tone according to this audible ringing tone mark, sends ACM to caller switch center then.

Step 116, RBTS plays this real-time ring back tone to calling terminal by O_MSC, stop to play the acquiescence ring-back tone simultaneously, the audio frequency that has comprised called subscriber's refusing to receive telephone in this real-time ring back tone is explained, like this, owing to explain in time, can avoid takeing in a wrong spirit between called subscriber and the calling subscriber, estrangement or unhappy greatly.

Step 117, when the calling subscriber hangs up the telephone, O_MSC sends release message REL (Release) signaling to RBTS, cut off immediately and RBTS between route, thereby stop to play real-time ring back tone to caller.Certainly, O_MSC can also preset the reproduction time value of real-time ring back tone, and for example 1 minute, the time was cut off route between O_MSC or the RBTS automatically to back O_MSC.

Fig. 2 A is the system configuration sketch of the embodiment of the invention two, and different with Figure 1A is, the RBTS of embodiment two only is connected with T_MSC, and the RBTS of embodiment one only is connected with O_MSC, and promptly embodiment two is by the broadcast of T_MSC control real-time ring back tone.

Fig. 2 B is the signaling process figure of the embodiment of the invention two.

Step 101～108 ofstep 201～208 and embodiment one are basic identical, unique different be that the called subscriber does not customize the acquiescence ring-back tone, but send traditional ring-back tone, i.e. the bell sound of " pouting ... pout ... " by T_MSC.Certainly, also can be the same to embodiment one, terminal called has customized corresponding acquiescence ring-back tone.

Step 209, T_MSC sends the traditional ringback sound to O_MSC, and this traditional ringback sound finally passes through calling terminal by O_MSC.

Step 210～211, terminal called obtain an audible ringing tone mark and send this audible ringing tone mark to T_MSC, and T_MSC sends to RBTS with this audible ringing tone mark again.It can be to obtain by prompting called subscriber input that terminal called obtains audible ringing tone mark, also can be the audible ringing tone mark of basis at the correspondence of terminal current state or pattern of living in setting, is obtained automatically by terminal.

Step 212, RBTS searches corresponding real-time ring back tone according to this audible ringing tone mark, sends ACM to T_MSC then.

Step 213, RBTS plays this real-time ring back tone by T_MSC, O_MSC to calling terminal, stops to play the traditional ringback sound simultaneously.Certainly, the scheme that also can adopt RBTS directly to play to O_MSC, RBTS at this moment is general, and requirement has CCF, knows owing to this scheme belongs to those skilled in the art, so repeat no more.

Step 214, when the calling subscriber hangs up the telephone, O_MSC receives that this hangs up information and send to T_MSC.Also can be after real-time ring back tone be play reasonable time execution instep 215.

Step 215, T_MSC sends the REL signaling to RBTS, cuts off the route between T_MSC and the RBTS immediately, thereby stops to play real-time ring back tone to calling terminal.

Fig. 3 A is the system configuration sketch of the embodiment of the invention three, and this system only comprises O_MSC, T_MSC, HLR, and does not possess RBTS, because embodiment two adopts T_MSC to preserve and play the scheme of real-time ring back tone.

Fig. 3 B is the signaling process figure of the embodiment of the invention three.

Step 101～108 ofstep 301～308 and embodiment one are basic identical, unique different be that the called subscriber does not customize the acquiescence ring-back tone, but send traditional ring-back tone, i.e. the bell sound of " pouting ... pout ... " by T_MSC (built-in ring-back tone unit).Based on same reason, also can send traditional ring-back tone by O_MSC.

Step 309, T_MSC gives calling terminal by O_MSC transparent transmission traditional ringback sound.

Step 310, terminal called are obtained an audible ringing tone mark and are sent this audible ringing tone mark to T_MSC; It can be to obtain by prompting called subscriber input that terminal called obtains audible ringing tone mark, also can be the audible ringing tone mark of basis at the correspondence of terminal current state or pattern of living in setting, is obtained automatically by terminal.

Step 311, T_MSC searches corresponding real-time ring back tone according to this audible ringing tone mark, and the real-time ring back tone that is somebody's turn to do to calling terminal of T_MSC stops to play the traditional ringback sound simultaneously then.Here, owing to utilize the T_MSC storage and play real-time ring back tone, the cost that may cause end office (EO) to transform is higher.

Step 312, when the calling subscriber hangs up the telephone, O_MSC sends the REL signaling to T_MSC, cuts off the route between O_MSC and the T_MSC immediately, thereby stops to play real-time ring back tone to caller.After also can playing the real-time ring back tone appropriate time, for example 1 minute, T_MSC stopped playing RBT automatically.And after stopping to play real-time ring back tone, each embodiment of the present invention all can select whether to play traditional prompt tone to O_MSC, as " called subscriber can't connect " etc.

Fig. 4 A and Fig. 4 B are the signaling process figure of the embodiment of the invention four, and its system configuration sketch is shown in Figure 1A.Embodiment four needed to judge whether terminal called has sent audible ringing tone mark in the section at the fixed time before playing the acquiescence ring-back tone, then play real-time ring back tone if receive audible ringing tone mark, otherwise play the acquiescence ring-back tone.

Step 401～408 are identical withstep 101～108 of embodiment one.

Step 409, O_MSC reserved a period of time (for example 5 seconds) and judges whether terminal called sends audible ringing tone mark before notice RBTS plays the acquiescence ring-back tone, and, the traditional ring-back tone that needs shielding T_MSC to play.If receive audible ringing tone mark, then carry outstep 410 and follow-up flow process thereof shown in Fig. 4 A.Otherwise carry out step 420 and subsequent step thereof shown in Fig. 4 B.Certainly, if the called subscriber do not customize the acquiescence ring-back tone, then can temporarily shield traditional ringback sound a period of time and judge by O_MSC.The benefit of doing like this is can avoid the calling subscriber to hear two kinds of ring-back tones, because might cause obscuring or discomfort of calling subscriber like that.

Step 410, O_MSC sends IAM to RBTS, and by this IAM information such as calling number, called number and described audible ringing tone mark is sent to RBTS.

Step 411, RBTS searches corresponding real-time ring back tone according to called number, sends ACM to O_MSC then.

Step 412, RBTS plays this real-time ring back tone by O_MSC to calling terminal.

Step 413, when the calling subscriber hangs up the telephone (also can be real-time ring back tone play certain hour after), O_MSC sends the REL signaling to RBTS, cut off immediately and RBTS between route, thereby stop to play real-time ring back tone to caller.

In the step 420 shown in Fig. 4 B, O_MSC does not receive the audible ringing tone mark that terminal called sends in the preset time section, then sends IAM to RBTS, and by this IAM information such as calling number, called number is sent to RBTS.

Step 421, RBTS obtains the acquiescence ring-back tone, sends ACM to O_MSC then.When the acquiescence ring-back tone is when being provided with according to called number, RBTS can be an acquiescence ring-back tone of searching called subscriber's customization according to this called number.

Step 422, RBTS plays this acquiescence ring-back tone by O_MSC to calling terminal.So far, just can be used as the complete scheme of embodiment four, hang up or give tacit consent to ring-back tone when caller and be played to the scheduled time, then stop to play, O_MSC cuts off and being connected of calling terminal.

When playing the acquiescence ring-back tone here certainly, if terminal called has sent audible ringing tone mark, O_MSC can receive, and also can not receive.Receive step 423 and the subsequent step thereof of scheme shown in Fig. 4 B of audible ringing tone mark.

Step 423～425, when RBTS by O_MSC during calling terminal sends the acquiescence ring-back tone, T_MSC receives the audible ringing tone mark that terminal called sends; T_MSC transfers to O_MSC with this audible ringing tone mark; O_MSC sends to RBTS with this audible ringing tone mark again.

Step 426, RBTS searches corresponding real-time ring back tone according to this audible ringing tone mark, sends ACM to O_MSC then.

Step 427, RBTS plays this real-time ring back tone by O_MSC to calling terminal, stops to play the acquiescence ring-back tone simultaneously.

Step 428, when the calling subscriber hangs up the telephone, perhaps real-time ring back tone has been play certain hour, O_MSC sends the REL signaling to RBTS, and cut off immediately and RBTS between route, thereby stop to play real-time ring back tone to calling terminal.

More than the purpose of four embodiment, all be to be used for the explanation that the called subscriber answers refusal.But in fact, the called subscriber can also send different audible ringing tone marks in real time according to actual conditions at that time, network side selects corresponding real-time ring back tone to send to the calling subscriber according to this audible ringing tone mark, after playing reasonable time, receive calls again, send the real-time ring back tone of state (mood etc.) at that time between the friend for example mentioned above, to satisfy user's demand neatly, the perhaps subscriber call ring-back tone demand of waiting a moment, concrete scheme is as described in the embodiment five.

Fig. 5 is the signaling process figure of embodiments of the invention five, and wherein step 501～516 are basic identical withstep 101～116 among the embodiment one, so repeat no more.What unique possibility was different is that in step 512, after terminal called sent audible ringing tone mark, the maintenance of T_MSC palpus was connected with terminal called.

Step 517～518, after terminal called was replied, T_MSC sent to O_MSC with response message ANM.

Step 519, O_MSC sends the REL signaling to RBTS, cuts off the route between O_MSC and the RBTS immediately, thereby stops to play real-time ring back tone to caller.

Step 520, the normal speech channel of setting up between the calling and called by O_MSC and T_MSC connects.

What deserves to be mentioned is, in the various embodiments of the present invention, if RBTS plays described acquiescence ring-back tone (or traditional ringback sound) and reaches predetermined amount of time: and terminal called does not send audible ringing tone mark or still dont answer or calling terminal on-hook not yet of terminal called yet; Then stop playing RBT, and end call connects by caller switching center and/or called switching center notice ring-back tone unit.In addition, the present invention and existing customization of ring back tone service do not clash, and those skilled in the art are easy to realize the real-time ring back tone business again on the basis of former customization audible ringing tone service.

Be understandable that; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of accompanying Claim of the present invention.

Claims (21)

Translated fromChinese

1、一种在通信网络中提供实时回铃音的方法，其特征在于，包括以下步骤：1, a kind of method providing real-time ring back tone in communication network, is characterized in that, comprises the following steps:A.被叫终端收到网络侧发来的主叫终端的呼叫请求；A. The called terminal receives the call request from the calling terminal from the network side;B.被叫终端向网络侧发送回铃音标识；B. The called terminal sends a ringback tone identifier to the network side;C.网络侧的回铃音单元根据该回铃音标识寻到对应的回铃音，并实时地播放给主叫终端。C. The ring back tone unit on the network side finds the corresponding ring back tone according to the ring back tone identifier, and plays it to the calling terminal in real time.2、根据权利要求1所述的提供实时回铃音的方法，其特征在于，所述步骤A之前，在回铃音单元根据回铃音标识保存对应的回铃音。2. The method for providing real-time ring back tone according to claim 1, characterized in that before the step A, the ring back tone unit stores the corresponding ring back tone according to the ring back tone identifier.3、根据权利要求2所述的提供实时回铃音的方法，其特征在于，所述回铃音标识为空时，对应的是设置的默认回铃音或者传统回铃音。3. The method for providing a real-time ring back tone according to claim 2, characterized in that, when the ring back tone identifier is empty, it corresponds to a set default ring back tone or a traditional ring back tone.4、根据权利要求1所述的提供实时回铃音的方法，其特征在于，所述步骤A之前，被叫终端在网络侧进行实时回铃音业务的签约，并将签约信息保存在被叫终端的归属位置寄存器HLR中；所述步骤A包括：主叫终端通过主叫交换中心请求呼叫被叫终端；主叫交换中心向被叫终端的归属位置寄存器HLR请求并获得该被叫终端的该签约信息和路由信息；主叫交换中心将该呼叫请求通过被叫交换中心发送给被叫终端。4. The method for providing real-time ring-back tone according to claim 1, characterized in that, before said step A, the called terminal signs the real-time ring-back tone service on the network side, and saves the signing information in the called terminal. In the home location register HLR of the terminal; the step A includes: the calling terminal requests to call the called terminal through the calling switching center; the calling switching center requests and obtains the called terminal's home location register HLR from the called terminal Subscription information and routing information; the calling switching center sends the call request to the called terminal through the called switching center.5、根据权利要求1或2所述的提供实时回铃音的方法，其特征在于，所述回铃音单元被设置在被叫交换中心或者主叫交换中心内；或者5. The method for providing real-time ring back tone according to claim 1 or 2, characterized in that, the ring back tone unit is set in the called switching center or the calling switching center; or所述回铃音单元为单独的回铃音服务器RBTS。The ring back tone unit is a separate ring back tone server RBTS.6、根据权利要求1所述的提供实时回铃音的方法，其特征在于，所述步骤B中，固定被叫终端通过DTMF方式，而将回铃音标识发送给被叫交换中心，该被叫交换中心再将该回铃音标识直接或间接地发送给回铃音单元。6. The method for providing real-time ring-back tone according to claim 1, characterized in that in said step B, the fixed called terminal sends the ring-back tone identifier to the called switching center through DTMF mode, and the called terminal Call the switching center and then directly or indirectly send the ring back tone identifier to the ring back tone unit.7、根据权利要求1所述的提供实时回铃音的方法，其特征在于，所述步骤B中，移动被叫终端通过Start DTMF消息一次或多次将回铃音标识发送给被叫交换中心，该被叫交换中心再将该回铃音标识直接或间接地发送给回铃音单元。7. The method for providing real-time ring-back tone according to claim 1, characterized in that, in the step B, the mobile called terminal sends the ring-back tone identification to the called switching center once or more times through the Start DTMF message , the called switching center then directly or indirectly sends the ring back tone identifier to the ring back tone unit.8、根据权利要求1所述的提供实时回铃音的方法，其特征在于，所述步骤B中，被叫终端通过用户到用户信令UUS或者断开消息Disconnect或者应答消息Connect发送回铃音标识到被叫交换中心，该被叫交换中心再将该回铃音标识直接或间接地发送给回铃音单元。8. The method for providing real-time ring-back tone according to claim 1, characterized in that, in the step B, the called terminal sends the ring-back tone through the user-to-user signaling UUS or disconnect message Disconnect or answer message Connect The identification is sent to the called switching center, and the called switching center then directly or indirectly sends the ring back tone identification to the ring back tone unit.9、根据权利要求1、6、7或8所述的提供实时回铃音的方法，其特征在于，所述回铃音标识由被叫用户通过被叫终端输入并发送给被叫交换中心；或者在被叫终端预先设置预定的状态对应相应的回铃音标识，被叫终端根据当前的终端状态而确定对应的回铃音标识，并自动发送该回铃音标识给被叫交换中心。9. The method for providing a real-time ring back tone according to claim 1, 6, 7 or 8, wherein the ring back tone identifier is input by the called user through the called terminal and sent to the called switching center; Alternatively, the corresponding ring-back tone identifier corresponding to the predetermined state is preset in the called terminal, and the called terminal determines the corresponding ring-back tone identifier according to the current terminal state, and automatically sends the ring-back tone identifier to the called switching center.10、根据权利要求1、6、7或8所述的提供实时回铃音的方法，其特征在于，所述回铃音标识发送给被叫交换中心后，被叫交换中心断开或不断开与被叫终端的连接。10. The method for providing real-time ring-back tone according to claim 1, 6, 7 or 8, characterized in that, after the ring-back tone identifier is sent to the called switching center, the called switching center disconnects or does not disconnect Connection to the called terminal.11、根据权利要求1所述的提供实时回铃音的方法，其特征在于，在所述步骤B之前，被叫交换中心还没收到回铃音标识时，由主叫交换中心和/或被叫交换中心通知回铃音单元播放设置的默认回铃音或系统的传统回铃音；11. The method for providing real-time ring-back tone according to claim 1, characterized in that before said step B, when the called switching center has not received the ring-back tone identification, the calling switching center and/or the called switching center Call the switching center to notify the ring-back tone unit to play the default ring-back tone or the traditional ring-back tone of the system;在被叫交换中心收到回铃音标识之后，执行所述步骤C，包括：After the called switching center receives the ring-back tone identification, perform the step C, including:C11.在被叫交换中心将该回铃音标识直接或间接地发送给回铃音单元，回铃音单元根据该回铃音标识寻到对应的实时回铃音；C11. send the ring back tone identification directly or indirectly to the ring back tone unit at the called switching center, and the ring back tone unit finds the corresponding real-time ring back tone according to the ring back tone identification;C12.回铃音单元停止播放所述默认回铃音或传统回铃音，并向主叫终端播放该实时回铃音。C12. The ring back tone unit stops playing the default ring back tone or the traditional ring back tone, and plays the real-time ring back tone to the calling terminal.12、根据权利要求1所述的提供实时回铃音的方法，其特征在于，在所述步骤B之前，被叫交换中心获知被叫终端处于空闲状态之后的预定时间段内，被叫交换中心和/或主叫交换中心先判断是否被叫终端发送了回铃音标识，并暂时不向主叫终端播放任何回铃音；若预定时间段内被叫交换中心收到回铃音标识则执行步骤C，否则通知回铃音单元播放设置的默认回铃音或系统的传统回铃音给主叫终端；所述步骤C包括：12. The method for providing real-time ringback tone according to claim 1, characterized in that, before the step B, the called switching center informs the called terminal within a predetermined period of time after the called terminal is idle And/or the calling switching center first judges whether the called terminal has sent the ring-back tone identification, and temporarily does not play any ring-back tone to the calling terminal; Step C, otherwise notify the ring back tone unit to play the default ring back tone set or the traditional ring back tone of the system to the calling terminal; said step C includes:C21.在被叫交换中心将该回铃音标识直接或间接地发送给回铃音单元，回铃音单元根据该回铃音标识寻到对应的实时回铃音；C21. send the ring back tone identification directly or indirectly to the ring back tone unit at the called switching center, and the ring back tone unit finds the corresponding real-time ring back tone according to the ring back tone identification;C22.回铃音单元向主叫终端播放该实时回铃音。C22. The ring back tone unit plays the real-time ring back tone to the calling terminal.13、根据权利要求11或12所述的提供实时回铃音的方法，其特征在于，若回铃音单元播放所述默认回铃音或传统回铃音达到预定时间段：而被叫终端仍未发送回铃音标识、或被叫终端仍未应答、或主叫终端仍未挂机；则由主叫交换中心和/或被叫交换中心通知回铃音单元停止播放回铃音，并终止呼叫连接。13. The method for providing real-time ring back tone according to claim 11 or 12, characterized in that if the ring back tone unit plays the default ring back tone or traditional ring back tone for a predetermined time period: and the called terminal still If no ring-back tone identifier is sent, or the called terminal has not answered, or the calling terminal has not yet hung up; then the calling switching center and/or the called switching center will notify the ring-back tone unit to stop playing the ring-back tone and terminate the call connect.14、根据权利要求1所述的提供实时回铃音的方法，其特征在于，所述步骤C中播放实时回铃音之后，14. The method for providing real-time ring back tone according to claim 1, characterized in that, after the real-time ring back tone is played in the step C,当主叫终端挂机，则由主叫交换中心和/或被叫交换中心通知回铃音单元停止播放实时回铃音，并终止呼叫连接；或者When the calling terminal hangs up, the calling switching center and/or the called switching center will notify the ringback tone unit to stop playing the real-time ringback tone and terminate the call connection; or当被叫终端应答，则由主叫交换中心和/或被叫交换中心通知回铃音单元停止播放实时回铃音，并接通主、被叫终端的话路；或者When the called terminal answers, the calling switching center and/or the called switching center notifies the ring-back tone unit to stop playing the real-time ring-back tone, and connect the calling and called terminals; or当回铃音单元播放预定时间段的实时回铃音之后，则由主叫交换中心和/或被叫交换中心通知回铃音单元停止播放实时回铃音，并终止呼叫连接。After the ring-back tone unit plays the real-time ring-back tone for a predetermined period of time, the calling switching center and/or the called switching center notifies the ring-back tone unit to stop playing the real-time ring-back tone and terminate the call connection.15、一种在通信网络中提供实时回铃音的系统，包括主叫交换中心、被叫交换中心、归属位置寄存器，其特征在于，进一步包括：15. A system for providing real-time ringback tone in a communication network, comprising a calling switching center, a called switching center, and a home location register, characterized in that it further includes:回铃音单元，其用于存储和播放实时回铃音；Ringback tone unit, which is used for storing and playing real-time ringback tone;当被叫终端接收到主叫终端的呼叫请求时，被叫终端发送回铃音标识给被叫交换中心，且被叫交换中心直接或间接地将该回铃音标识发送给回铃音单元，回铃音单元根据该回铃音标识寻到对应的回铃音并实时地播放给主叫终端。When the called terminal receives the call request of the calling terminal, the called terminal sends the ring back tone identifier to the called switching center, and the called switching center directly or indirectly sends the ring back tone identifier to the ring back tone unit, The ring back tone unit finds the corresponding ring back tone according to the ring back tone identifier and plays it to the calling terminal in real time.16、根据权利要求15所述的提供实时回铃音的系统，其特征在于，所述回铃音单元被设置在被叫交换中心内或主叫交换中心内；或者16. The system for providing real-time ring back tone according to claim 15, characterized in that, the ring back tone unit is set in the called switching center or in the calling switching center; or所述回铃音单元为单独的回铃音服务器RBTS。The ring back tone unit is a separate ring back tone server RBTS.17、根据权利要求15或16所述的提供实时回铃音的系统，其特征在于，所述回铃音单元还根据回铃音标识保存对应的回铃音；回铃音单元收到被叫终端发送来的回铃音标识后，通过该回铃音标识寻到对应的实时回铃音。17. The system providing real-time ring back tone according to claim 15 or 16, characterized in that, the ring back tone unit also stores the corresponding ring back tone according to the ring back tone identification; the ring back tone unit receives the called After the ring back tone identifier sent by the terminal, the corresponding real-time ring back tone is found through the ring back tone identifier.18、根据权利要求15所述的提供实时回铃音的系统，其特征在于，固定被叫终端通过DTMF方式，将回铃音标识发送给被叫交换中心；或者18. The system for providing real-time ring back tone according to claim 15, characterized in that the fixed called terminal sends the ring back tone identifier to the called switching center through DTMF; or移动被叫终端通过Start DTMF消息，将回铃音标识发送给被叫交换中心。The mobile called terminal sends the ring-back tone identifier to the called switching center through the Start DTMF message.19、根据权利要求15所述的提供实时回铃音的系统，其特征在于，被叫终端通过用户到用户信令UUS或者断开消息Disconnect或者应答消息Connect发送回铃音标识到被叫交换中心。19. The system for providing real-time ring back tone according to claim 15, characterized in that, the called terminal sends the ring back tone identification to the called switching center through the user-to-user signaling UUS or the disconnect message Disconnect or the answer message Connect .20、根据权利要求15所述的提供实时回铃音的系统，其特征在于，所述回铃音标识由被叫用户在被叫终端输入并发送给被叫交换中心；或者在被叫终端预先设置预定的状态对应相应的回铃音标识，被叫终端根据当前的终端状态而确定对应的回铃音标识，并自动发送该回铃音标识给被叫交换中心。20. The system for providing real-time ring back tone according to claim 15, characterized in that, the ring back tone identifier is input by the called user at the called terminal and sent to the called switching center; The predetermined state is set to correspond to the corresponding ring-back tone identifier, and the called terminal determines the corresponding ring-back tone identifier according to the current terminal state, and automatically sends the ring-back tone identifier to the called switching center.21、根据权利要求15所述的提供实时回铃音的系统，其特征在于，所述被叫交换中心收到被叫终端的回铃音标识后，被叫交换中心断开或不断开与被叫终端的连接。21. The system for providing real-time ring-back tone according to claim 15, characterized in that, after the called switching center receives the ring-back tone identifier of the called terminal, the called switching center disconnects or does not disconnect from the called terminal. Called terminal connection.

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