CN101656918B - Method and system for presenting group conversation state in PTT session in real time - Google Patents
Method and system for presenting group conversation state in PTT session in real time Download PDFInfo
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- CN101656918B CN101656918B CN2009101773129A CN200910177312A CN101656918B CN 101656918 B CN101656918 B CN 101656918B CN 2009101773129 A CN2009101773129 A CN 2009101773129A CN 200910177312 A CN200910177312 A CN 200910177312A CN 101656918 B CN101656918 B CN 101656918B
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Abstract
The invention discloses a method and a system for presenting a group conversation state in a PTT session in real time. The method comprises the following steps: after a group call is started, a PTT exchange unit transmits conversation states of the current group members to an MSC; the MSC transmits the conversation states of the group members to all group members in group conversation; and when the conversation state of any group member is changed, the PTT exchange unit informs the conversation state of the group member with the changed conversation state to other group members in the group conversation by the MSC. The group members in the current group conversation can master the conversation states of other group members in real time. The scheme enriches the functions of group users and strengthens the experience of the group users by reasonably and simply extending the 3GPP standard in the prior art. Manufacturers of network equipment and terminal equipment just support the extended protocol in the software of the equipment without carrying out hardware investment, thereby the realization cost is lower.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to the method and system that group conversation state appears in real time in a kind of PTT session.
Background technology
PTT (Push To Talk, a key logical) uses the mobile phone that corresponding function is arranged as intercom, be a kind of half-duplex communication mode, and this mobile phone has individual intercommunication key, after the user presses, just can with other users or group call.Group call is in the PTT session again, is to realize that through public mobile cellular network technology button is logical, and the maximum characteristics of this technology are to utilize present public mobile network that group's intercommunication function is provided.
This technical scheme has the mature technique scheme to realize and business operation model in present many countries; Application is all arranged in 2G and 3G, and commercial PTT session implementation is divided into two types, and one type is CS territory (CircuitSwitch Domain; Circuit commutative field); One type is PS (Packet Switch Domain, packet-switched domain), and circuit domain adopts the 3GPP standard agreement to realize.
The network topology structure that the PTT session realizes in the CS territory is as shown in Figure 1; MSC (Mobile SwitchingCenter; Mobile switching centre) is responsible between mobile call terminal and PTT crosspoint, transmitting call signaling; And for mobile call terminal carries out exchange of speech, SC (SMS Center, short message service center) then is responsible between mobile call terminal and PTT crosspoint, transmitting group and presenting message; Group representes with the chain-dotted line four-headed arrow that with the transmission that presents message call signaling and exchange of speech are represented with the solid line four-headed arrow.Appearing here and be meant and present online, interruption-free, User Status such as leave, is two different categories with presenting talking state.
But in present realization, all there is a common incomplete place: do not support the function that group conversation state appears.Specifically, we are in the PTT session, after the session initiator initiation session; Any one member answers in the group, promptly gets into talking state, and promptly begin to have conversed this moment; Meanwhile, because each member's network state is different in the group, such as this locality or roaming; And subjective response time of each member is different, the entering session status that group member can be one by one, even differ more than 15 seconds; This can cause people of front speech whom does not know to have whom has inserted listening with follow-up, and what the people that the back gets into conversation did not know that the front making a speech yet is whom, because for being who grasps the right to speak in the cluster conversation at present; Also be the auditory discrimination that depends on the user, whether in session, can not come into plain view for the member in the mutual unfamiliar session group.And when member in the group owing to on-hook or go offline when dropping by the wayside session, in the group other also the member in session can not know.
Summary of the invention
The technical problem that the present invention will solve is; Realization to CS territory scheme; The method and system that group conversation state appears in real time in a kind of PTT session is provided, overcomes the defective that the group member of participating in the PTT session in the prior art can not be grasped other group member talking states in real time.
The technical scheme that the present invention adopts is that the method that group conversation state appears in real time in the said PTT session comprises following concrete steps:
After step 1, group call were initiated, the PTT crosspoint sent to moving exchanging center MSC with the talking state of current group member;
PTT crosspoint described in the said step 1 sends to said MSC through Signaling System Number 7 with the talking state of current group member, and the content of carrying in the said Signaling System Number 7 comprises the talking state of group member telephone number and corresponding group member.
Said step 2 specifically comprises: said MSC for sending the address, sends the talking state of the group member of correspondence in the group call all group members through the progress message in the L3 signaling according to the group member telephone number that obtains from the PTT crosspoint.
PTT crosspoint described in the said step 3 notifies the process to other group members in the group call to comprise through the talking state of the group member that MSC changes talking state:
Talking state after the PTT crosspoint changes group member through Signaling System Number 7 sends to MSC, and the talking state after MSC changes said group member sends other group members in the group call to through the progress message in the L3 signaling.
Also comprise after the said step 3: after step 4, group member are received Progress message, resolve and show the content of User-user message elements in the Progress message.
As a kind of optimized technical scheme, said step 4 comprises:
Group member judges that the agreement whether group conversation state information is arranged in the User-user message elements differentiates word after receiving Progressr message, if having, then by appointment data format is resolved and shown the content in the User-user message elements.
As another kind of optimized technical scheme, said step 4 comprises:
Group member is after receiving Progress message; At first judge the agreement discriminating word whether group conversation state information is arranged in the User-user message elements; If have; Then further judge self whether to be in group conversation state, if then by appointment data format is resolved and shown the content in the User-user message elements.
The present invention also provides the system that group conversation state appears in real time in a kind of PTT session, comprising:
Mobile call terminal is used for initiating or receiving group call as group member, receive the talking state of group member simultaneously and with its parsing and displaying in this locality;
The PTT crosspoint is used for the talking state of group member is sent to MSC;
MSC is used for the talking state of group member is sent to the group member of group call.
Said PTT crosspoint sends to MSC through Signaling System Number 7 with the talking state of group member.
Said MSC sends to the group member in the group call through the progress message in the L3 signaling with the talking state of group member.
Said MSC is further used for:
After group call was initiated, the group member talking state that MSC sends the PTT crosspoint sent all members in the group call to;
When the talking state of arbitrary group member changed, the talking state of the group member that the talking state that MSC sends the PTT crosspoint changes sent other group members in the group call to.
Adopt technique scheme, the present invention has advantage at least:
The method and system that group conversation state appears in real time in the PTT session according to the invention; Realization based on CS territory scheme; Software function among mobile call terminal, PTT crosspoint and the MSC is improved; After group call is initiated; The PTT crosspoint sends to MSC with the talking state of current group member, and MSC sends the talking state of group member in the group call all group members, when the talking state of arbitrary group member changes; The talking state of the group member that the PTT crosspoint changes to other group members notice talking states through MSC makes the talking state of other group members of grasp that group member in the current group call can be real-time.This programme enriches the group user function through the 3GPP standard of prior art being carried out rationally, simply expanding, and strengthens group user and experiences.The network equipment and terminal equipment manufacturer need not carry out hardware investment, only need in the software of equipment, support the agreement of this expansion to get final product, so it is lower to implement cost.
Description of drawings
Fig. 1 is the network topology structure sketch map that the PTT session realizes in the CS territory in the prior art;
The method flow diagram that Fig. 2 appears for group conversation state in the said PTT session of first embodiment of the invention in real time;
The method flow diagram that Fig. 3 appears for group conversation state in the said PTT session of second embodiment of the invention in real time;
Fig. 4 is the message format sketch map of the User-user message elements of progress message;
The system configuration sketch map that Fig. 5 appears for group conversation state in the said PTT session of third embodiment of the invention in real time;
Fig. 6 is the Signalling exchange sketch map of once concrete PTT conversation procedure in the fourth embodiment of the invention.
Embodiment
Reach technological means and the effect that predetermined purpose is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, the method and system that group conversation state appears in real time in the said PTT session that the present invention is proposed, specify as after.
First embodiment of the invention, as shown in Figure 2, the method that group conversation state appears in real time in a kind of PTT session comprises the steps:
After step 101, group call were initiated, the PTT crosspoint sent to MSC through Signaling System Number 7 with current group member talking state, and the content of carrying in the said Signaling System Number 7 comprises the talking state of the group member telephone number and the group member of correspondence.
Talking state after step 104, MSC change said group member sends other group members in the group call to through the progress message in the L3 signaling.These other group members also can be all related group members of group call, and MSC sends the talking state after said group member changes according to the group member telephone number that obtains from the PTT crosspoint for sending the address.
Explain that below the present invention adopts the User-user message elements of progress message to transmit the reason of group's call status information:
General PTT message such as management and group with present message and carry through note, we know that note is because the real-time problem can not satisfy the transmission of transmitting group conversation state information in the PTT session.
So we must have more real-time means to transmit, the relevant signaling in research CS territory, we find that progress message can satisfy our requirement from aspects such as real-time, effect time domain and portability content-lengths:
1) progress message is real-time;
2) time domain that can have an effect for progress message of whole group call process;
3) content that need carry is a group conversation state information; The length of the user-user message elements of message can be 131 bytes; Skim 3 bytes in packet header of front; Also have 128 operable bytes of reality, and generally in the PTT session, adopt character string as shown in the table to characterize each group member in the group call:
| Group id | Group member 1 (member id+ current state) | Group member 2 (member id+ current state) | ...... | Group member n (member id+ current state) |
Because general mobile call terminal support is no more than 32 groups, account for 5bit at most, every group membership is no more than 32; Account for 5bit at most, and state also can not surpass 8 kinds, accounts for 3bit at most; And actual group conversation state information; Take 5bit+ (5bit+3bit) * 32=33 byte at most, even add some protocol header fields, the length of the user-user message elements of progress message also is enough to use.
Second embodiment of the invention, as shown in Figure 3, the method that group conversation state appears in real time in a kind of PTT session comprises the steps:
After step 201, group call were initiated, the PTT crosspoint sent to MSC through Signaling System Number 7 with current group member talking state, and the content of carrying in the said Signaling System Number 7 comprises the talking state of the group member telephone number and the group member of correspondence.
Talking state after step 204, MSC change said group member sends other group members in the group call to through the progress message in the L3 signaling.These other group members also can be all related group members of group call, and MSC sends the talking state after said group member changes according to the group member telephone number that obtains from the PTT crosspoint for sending the address.
Whether the difference of the present embodiment and first embodiment is in group member is judged the User-user message elements of Progress message, to have the agreement of group conversation state information to differentiate after the word User-user protocoldiscriminator; Increased group member and judged whether self is in the step of group conversation state; Its objective is in order in the process of mobile communication, not influence the occasion of existing Using P rogress message; And when wrong and abnormality occurring; The method that adopts the said group conversation state of present embodiment to appear in real time; Can also guarantee the talking state of other group members of grasp that group member in the current group call can be real-time and correct; Because to the user in the non-current group call, even, also can not produce any influence to it owing to reasons such as other application scenario or system exception have been received Progress message.
Third embodiment of the invention; The system that group conversation state appears in real time in a kind of PTT session; As shown in Figure 5, group of the prior art representes with the chain-dotted line four-headed arrow that with the transmission that presents message call signaling and exchange of speech are represented with the solid line four-headed arrow; The transmission of the progress message of the transmission group call status information that the present invention adopts representes that with unidirectional double dotted arrow this system comprises:
Mobile call terminal; Be used for initiating or receive group call as group member; Receive the progress message of the talking state that carries group member that MSC sends simultaneously, and data format by appointment parses group member from progress message talking state is presented at this locality;
The PTT crosspoint; Be used for the talking state of group member being sent to MSC through Signaling System Number 7; Because the PTT crosspoint is being grasped the talking state of all group members in the group call; The present invention is on the basis of PPT crosspoint existing capability, and the talking state of all group members of its grasp is sent to MSC through Signaling System Number 7, informs to each group member through MSC again;
MSC; Be used for the talking state of group member is sent to the group member of group call; Specifically comprise: after group call was initiated, MSC sent the group member talking state that the PTT crosspoint sends in the group call all members through the progress message in the L3 signaling;
When the talking state of arbitrary group member changed, the talking state of the group member that the talking state that MSC sends the PTT crosspoint changes sent other group members to through the progress message in the L3 signaling.
Fourth embodiment of the invention is an example with a concrete PTT conversation procedure, describes the process of the method realization that group conversation state appears in real time in the PTT session according to the invention; As shown in Figure 6, three mobile call terminals carry out group call through MSC and PTT crosspoint, for the mobile call terminal of end side; MSC and PTT crosspoint belong to the equipment of network side; Because the PTT crosspoint can only be connected with mobile communication terminal through MSC, the while is in order to save the accompanying drawing space, MSC and PTT crosspoint regarded as an integral body of network side; Four-headed arrow representes to have the interactive messages group among Fig. 6, and unidirectional arrow is represented the message of unidirectional transmission.
1) the first mobile call terminal A place calls number is initiated the PTT group call;
2) MSC judges that this call number is the PTT group call, and the PTT group call is communicated to the PTT crosspoint, and the PTT crosspoint is connected the voice link with the first mobile call terminal A;
3) the PTT crosspoint is analyzed the group member information in this PTT group call; Instruct MS C prepares to connect the voice link of PTT crosspoint and each group member one by one; Promptly begin to call out each group member, in this example, call out the second mobile call terminal B and the 3rd mobile call terminal C;
4) the second mobile call terminal B answering call, MSC connects the voice link between the second mobile call terminal B and the PTT crosspoint;
5) the PTT crosspoint through Signaling System Number 7 with the second mobile call terminal B get into the state of listening attentively to and the 3rd mobile call terminal C its unaccessed state, the first mobile call terminal A is that floor status sends to MSC, the content of carrying in the said Signaling System Number 7 comprises the telephone number and corresponding talking state of mobile call terminal;
MSC is the transmission address according to the telephone number of the first mobile call terminal A that obtains from the PTT crosspoint; State is listened attentively in second mobile call terminal B entering sent to the first mobile call terminal A through the progress message in the L3 signaling; First mobile call terminal A data format is by appointment resolved and is shown the content among the information field User-user information of User-user message elements; Promptly the second mobile call terminal B gets into the state of listening attentively to; Because the 3rd mobile call terminal C is in its unaccessed state; MSC shows that it does not also join in this group call, so need not send the second mobile call terminal B and get into the state of listening attentively to the 3rd mobile call terminal C;
The telephone number that MSC sends according to the first mobile call terminal A that obtains from the PTT crosspoint and the second mobile call terminal B is the transmission address; Send the 3rd mobile call terminal C its unaccessed state to the first mobile call terminal A and the second mobile call terminal B through the progress message in the L3 signaling; After the first mobile call terminal A and the second mobile call terminal B receive Progress message; Judge that the agreement whether group conversation state information is arranged in the User-user message elements of Progress message differentiates word User-userprotocol discriminator; If do not have; Then the User-user message elements is not handled; If have; Explain then among the information field User-user information of this User-user message elements and contain group conversation state information that the first mobile call terminal A and second mobile call terminal B data format is by appointment resolved and shown the content among the information field User-user information of User-user message elements, i.e. the 3rd mobile call terminal C its unaccessed state;
MSC is the transmission address according to the telephone number of the second mobile call terminal B that obtains from the PTT crosspoint; With the first mobile call terminal A is that floor status sends the second mobile call terminal B to through the progress message in the L3 signaling; Second mobile call terminal B data format is by appointment resolved and is shown the content among the information field User-user information of User-user message elements; Promptly the first mobile call terminal A is a floor status; Because the 3rd mobile call terminal C is in its unaccessed state; Show that it does not also join in this group call, so it is that floor status is given the 3rd mobile call terminal C that MSC need not send the first mobile call terminal A.
6) the 3rd mobile call terminal C receives calls, and MSC connects the voice link between the 3rd mobile call terminal C and the PTT crosspoint;
7) MSC sends the second mobile call terminal B and gets into and to listen attentively to state and the first mobile call terminal A is that floor status is given the 3rd mobile call terminal C; The 3rd mobile call terminal C data format is by appointment resolved and is shown the content among the information field User-user information of User-user message elements then, and promptly the second mobile call terminal B gets into and listens attentively to state and the first mobile call terminal A is a floor status.
8) the PTT crosspoint is listened attentively to state through Signaling System Number 7 with the 3rd mobile call terminal C entering and is sent to MSC; MSC is the transmission address according to the telephone number of the first mobile call terminal A that obtains from the PTT crosspoint and the second mobile call terminal B; State is listened attentively in the 3rd mobile call terminal C entering sent to the first mobile call terminal A and the second mobile call terminal B through the progress message in the L3 signaling; After the first mobile call terminal A and the second mobile call terminal B receive Progress message; Judge that the agreement whether group conversation state information is arranged in the User-user message elements of Progress message differentiates word User-userprotocol discriminator; If do not have; Then the User-user message elements is not handled,, then explained among the information field User-user information of this User-user message elements and contain group conversation state information if having; The first mobile call terminal A and second mobile call terminal B data format is by appointment resolved and is shown the content among the information field User-user information of User-user message elements, and promptly the 3rd mobile call terminal C gets into the state of listening attentively to.
9) first mobile call terminal A release right to speak promptly gets into the state of listening attentively to, and informs the PTT crosspoint through MSC;
10) the PTT crosspoint is listened attentively to state through Signaling System Number 7 with first mobile call terminal A entering and is sent to MSC; MSC is the transmission address according to the telephone number of second mobile call terminal B that obtains from the PTT crosspoint and the 3rd mobile call terminal C; State is listened attentively in first mobile call terminal A entering sent to the second mobile call terminal B and the 3rd mobile call terminal C through the progress message in the L3 signaling; After the second mobile call terminal B and the 3rd mobile call terminal C receive Progress message; Judge that the agreement whether group conversation state information is arranged in the User-user message elements of Progress message differentiates word User-userprotocol discriminator; If do not have; Then the User-user message elements is not handled,, then explained among the information field User-user information of this User-user message elements and contain group conversation state information if having; The second mobile call terminal B and the 3rd mobile call terminal C data format is by appointment resolved and is shown the content among the information field User-user information of User-user message elements, and promptly the first mobile call terminal A gets into the state of listening attentively to.
11) the 3rd mobile call terminal C request floor power, PTT crosspoint ruling the 3rd mobile call terminal C obtains the floor;
12) the PTT crosspoint gets into floor status through Signaling System Number 7 with the 3rd mobile call terminal C and sends to MSC; MSC is the transmission address according to the telephone number of the first mobile call terminal A that obtains from the PTT crosspoint and the second mobile call terminal B; The 3rd mobile call terminal C is got into floor status send the first mobile call terminal A and the second mobile call terminal B to through the progress message in the L3 signaling; After the first mobile call terminal A and the second mobile call terminal B receive Progress message; Judge that the agreement whether group conversation state information is arranged in the User-user message elements of Progress message differentiates word User-userprotocol discriminator; If do not have; Then the User-user message elements is not handled,, then explained among the information field User-user information of this User-user message elements and contain group conversation state information if having; The first mobile call terminal A and second mobile call terminal B data format is by appointment resolved and is shown the content among the information field User-user information of User-user message elements, and promptly the 3rd mobile call terminal C gets into floor status.
13) the second mobile call terminal B on-hook, notice PTT crosspoint B takes out stitches;
14) the PTT crosspoint withdraws from the second mobile call terminal B from group conversation state through Signaling System Number 7 and sends to MSC; MSC is the transmission address according to the telephone number of first mobile call terminal A that obtains from the PTT crosspoint and the 3rd mobile call terminal C; The second mobile call terminal B is withdrawed from group conversation state send the first mobile call terminal A and the 3rd mobile call terminal C to through the progress message in the L3 signaling; After the first mobile call terminal A and the 3rd mobile call terminal C receive Progress message; Judge that the agreement whether group conversation state information is arranged in the User-user message elements of Progress message differentiates word User-user protocol discriminator; If do not have; Then the User-user message elements is not handled; If have; Then explain among the information field User-user information of this User-user message elements and contain group conversation state information, the first mobile call terminal A and the 3rd mobile call terminal C data format is by appointment resolved and is shown the content among the information field User-user information of User-user message elements, and promptly the second mobile call terminal B withdraws from group conversation state.
This programme can enrich the group user function through the 3GPP standard of prior art being carried out rationally, simply expanding, and strengthens group user and experiences.The network equipment and terminal equipment manufacturer need not carry out hardware investment, only need in the software of equipment, support the agreement of this expansion to get final product, so it is lower to implement cost.
Through the explanation of embodiment, should be to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the present invention, yet appended diagram only provide the usefulness of reference and explanation, is not to be used for the present invention is limited.
Claims (6)
1. the method that group conversation state appears in real time in the PTT session is characterized in that, may further comprise the steps:
After step 1, group call were initiated, the PTT crosspoint sent to moving exchanging center MSC with the talking state of current group member;
Step 2, said MSC send the talking state of group member in the group call all group members;
Step 3, when the talking state of arbitrary group member changes, said PTT crosspoint is notified to other group members in the group call through the talking state of the group member that said MSC changes talking state, specifically comprises:
Talking state after the PTT crosspoint changes group member through Signaling System Number 7 sends to MSC, and the talking state after MSC changes said group member sends other group members in the group call to through the Progress message in the L3 signaling;
After step 4, group member are received Progress message, resolve and show the content of User-user message elements in the Progress message, the detailed process of said step 4 comprises:
Group member judges that the agreement whether group conversation state information is arranged in the User-user message elements differentiates word after receiving Progress message, if having, then by appointment data format is resolved and shown the content in the User-user message elements.
2. the method that appears in real time according to the said group conversation state of claim 1; It is characterized in that; PTT crosspoint described in the said step 1 sends to said MSC through Signaling System Number 7 with the talking state of current group member, and the content of carrying in the said Signaling System Number 7 comprises the talking state of group member telephone number and corresponding group member.
3. the method that appears in real time according to the said group conversation state of claim 1; It is characterized in that; Said step 2 specifically comprises: said MSC serves as to send the address with the group member telephone number that obtains from the PTT crosspoint, sends the talking state of the group member of correspondence in the group call all group members through the Progress message in the L3 signaling.
4. the method that appears in real time according to the said group conversation state of claim 1 is characterized in that, the detailed process of said step 4 replaces with:
Group member is after receiving Progress message; At first judge the agreement discriminating word whether group conversation state information is arranged in the User-user message elements; If have; Then further judge self whether to be in group conversation state, if then by appointment data format is resolved and shown the content in the User-user message elements.
5. the system that group conversation state appears in real time in the PTT session is characterized in that, comprising:
Mobile call terminal is used for initiating or receiving group call as group member, receive the talking state of group member simultaneously and with its parsing and displaying in this locality; Mobile call terminal specifically is used for after receiving Progress message; Judge the agreement discriminating word whether group conversation state information is arranged in the User-user message elements; If have, then by appointment data format is resolved and is shown the content in the User-user message elements;
The PTT crosspoint is used for the talking state of group member is sent to MSC; The PTT crosspoint is further used for through Signaling System Number 7 the talking state of group member being sent to MSC;
MSC is used for the talking state of group member is sent to the group member of group call; MSC is further used for through the Progress message in the L3 signaling talking state of group member being sent to the group member in the group call.
6. the system that appears in real time according to the said group conversation state of claim 5 is characterized in that, said MSC is further used for:
After group call was initiated, MSC sent the talking state of the group member that the PTT crosspoint sends in the group call all members;
When the talking state of arbitrary group member changed, the talking state of the group member that the talking state that MSC sends the PTT crosspoint changes sent other group members in the group call to.
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| CN2009101773129A CN101656918B (en) | 2009-09-29 | 2009-09-29 | Method and system for presenting group conversation state in PTT session in real time |
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| CN102196368B (en) * | 2010-03-19 | 2015-12-16 | 中兴通讯股份有限公司 | Trunked call method of state management and device |
| CN102187695A (en) * | 2011-04-14 | 2011-09-14 | 华为终端有限公司 | Method and apparatus for switching calling groups |
| CN105610693B (en) * | 2016-01-07 | 2019-07-02 | 天脉聚源（北京）科技有限公司 | A kind of group chat is in screen state display method and device |
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| CN101163283A (en) * | 2007-11-05 | 2008-04-16 | 中兴通讯股份有限公司 | Method of performing call authority condition prompting when the terminal performs PTT call |
| CN101267609A (en) * | 2008-04-24 | 2008-09-17 | 中兴通讯股份有限公司 | Terminal state inquiry method for cluster system |
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| CN1838794A (en) * | 2005-03-23 | 2006-09-27 | 中国铁通集团有限公司 | Colony terminal state information searching method |
| CN1897719A (en) * | 2005-07-16 | 2007-01-17 | 中兴通讯股份有限公司 | Method for inquiring packet-member state in packet system |
| CN101163283A (en) * | 2007-11-05 | 2008-04-16 | 中兴通讯股份有限公司 | Method of performing call authority condition prompting when the terminal performs PTT call |
| CN101267609A (en) * | 2008-04-24 | 2008-09-17 | 中兴通讯股份有限公司 | Terminal state inquiry method for cluster system |
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