CN101420434B - P2P method for supporting VoIP communication - Google Patents
P2P method for supporting VoIP communication Download PDFInfo
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Abstract
The present invention provides a P2P method supporting VoIP communication. A VoIP terminal and a server are all one node in the P2P network, and all nodes form an overlay network in the P2P network. The method of the invention comprises establishing the P2P network, selecting and establishing path. The whole P2P network is divided into three layers and four roles, wherein the three layers are a common node layer, a super node layer and a middle node layer. The four roles of P2P nodes are the following: NN: common node, FN: forwarding node, SN: super node, and CN: middle node of P2P network. Firstly the NN needs to be registered to SN. The SN receives the registration of NN/FN. The CN takes charge of establishing various regulations and strategies, at the same times takes charge of information exchange between SN-1 and SN-2, receives the registration of SN, manages the total network FN list, transmits an FN list to the SN and transmits a strategy to NN/FN. The VoIP and medium flow are all transmitted through a virtual path combined between NN/FN.
Description
Technical field
Communication of the present invention relates to technical field, particularly a kind of P2P method of supporting VoIP communication.
Background technology
P2P technical development is at present maked rapid progress, and various P2P use and also emerge in an endless stream.Begin most P2P and use the shared and transmission that is mainly used in file, mainly represent software that Napster is arranged, BT, eMule etc.The main characteristic of these P2P is exactly a shared file, and the transmission of file does not require for real-time.VoIP (voice communication) field has then been arrived the P2P application extension in the appearance of Skype, has realized the transmission of real-time media stream on the P2P network, has promoted the development of P2P technology greatly.
The application of the current real-time media of transmitting in the P2P network mainly is an IPTV.The difference that IPTV and VoIP use is that VoIP needs two-way real-time media stream, and IPTV then only needs unidirectional Media Stream, and this Media Stream requires also very big with the VoIP difference for real-time.Just think, when using the P2P Web TV, software has carried out the buffering of Media Stream on the backstage, does not have what influence for user's sense organ.But for the real-time application of VoIP, after the user can't stand and oneself say in short, the other side need wait for several seconds and just hear, and gone over several seconds when oneself hearing the other side's response, and obviously, such interchange can't be carried out.
The difficult point that VoIP is applied on the P2P is exactly how to guarantee the quality of VoIP.What the user wished to hear is clear, continuous, the voice of low time delay, rather than interrupted, the often communication of interrupting.The addressing of current P2P network can only solve 2 direct transmission.But, many times, under the internet environment especially at home, the direct transmission between 2, network quality is not best.Therefore, guarantee the VoIP application quality, must between two addresses, find out a best transmission path, guarantee the content of transmitting.
For high-quality support VoIP transmission on the P2P network, the inventor has proposed a kind of P2P method of the VoIP of support real time communication.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of P2P framework is provided, can be effective, support the P2P method of VoIP real time communication efficiently.
A kind of P2P method of supporting the VoIP real time communication, this method make and the signaling that P2P can carrying VoIP and the transmission of real-time media stream realize the VoIP communication.The basic technical scheme of this method is: VoIP terminal and server all are nodes in the P2P network, and all nodes form an overlay network in the P2P network.Node in this overlay network according to the difference of function, is divided into ordinary node (NN, only enjoy service), (FN has the function of NN to forward node, provide the service of forwarding simultaneously), (SN has the function of FN to super node, has management function, NN/FN is registered to SN), Centroid CN (all SN are registered to CN, and by CN exchange FN information, CN can issue various strategies simultaneously).VoIP registration and call signaling all transmit by the P2P network, after the call proceeding success, Media Stream transmits the optimal path of selecting of intelligence in the P2P network, the Network Transmission quality of while P2P network real-time monitoring Media Stream, when media delivery is interrupted or after network quality drops to a certain degree, the P2P network will be reselected optimal transmission paths, guarantee the quality of VoIP communication.The invention solves the real-time of the ensuring the quality of products transmission difficult problem that VoIP runs in the P2P network, can improve the quality of VoIP communication greatly, and can solve the difficult problem that network is closed down.
The technical scheme of invention:
A kind of P2P method of supporting VoIP communication comprises P2P network construction and Path selection and foundation, and whole P2P network is divided into 3 layers of 4 kinds of role,
1-1,3 layers are respectively the ordinary node layer, super node layer, Centroid layer
1-2,4 kinds of roles' P2P node is respectively:
NN: ordinary node, the service of forwarding is not provided, only enjoy service, need be registered to SN,
FN: forward node at first is NN, and the service of forwarding is provided simultaneously, need be registered to SN,
SN: super node, accept the registration of NN/FN, need be registered to CN,
Centroid in the CN:P2P network is responsible to define various rules and strategy, also is responsible for simultaneously the information exchange between SN-1 and the SN-2, accepts the registration of SN, and the FN tabulation of management the whole network issues the FN SN that tabulates, and distributing policy is to NN/FN,
Relation between 1-3, layer and the role is as follows:
(1) all NN/FN form the ordinary node layer
(2) all SN form the super node layer
(3) all CN organization center node layer.
1, P2P network construction
(1) in order effectively to carry out addressing and to select path efficiently, need to set up the P2P network, this network needs at least one SN node, when surpassing a SN node, needs to increase the CN node
(2) each VoIP terminal, soft switch, media gateway all are nodes in this network, below all are called for short node
(3) each node has all disposed one or more SN information
(4) all node initializing roles are NN, according to the SN information that oneself obtains, select a SN to register
(5) after NN succeeds in registration, SN will issue various strategies to NN, if management level have independently strategy at certain NN, then issue corresponding independent strategies, if independently not tactful, then issue general policies
(6) NN is after receiving the strategy of SN, and whether oneself can provide transmit service, if the service of forwarding can be provided, then notify SN oneself to become FN, and the idle bandwidth that oneself can provide resource is provided if judging
(7) after SN finds that NN becomes FN, notify all SN FN information
(8) when SN and NN contact interruption, NN selects other SN registration, and SN then notifies certain FN of other SN to interrupt.
2, Path selection and foundation
(1) the VoIP terminal is when the soft switch signaling is communicated by letter, and NN finds not foundation of path, then to SN application FN resource
(2) after NN obtains the FN resource, will survey NN ← → soft switch, NN ← → FN ← → path between the soft switch
(3) according to result of detection, the strategy that uses SN to issue is chosen a best paths, for signaling, keeps this path for a long time
(4) for Media Stream, need the quality of real-time inspection network service, in case find that communication quality descends or network service is interrupted, then select a paths communication fast, and select other available path simultaneously.After choosing optimal path, switch to optimal path and communicate
(5) after media communication finishes, need all resources on this path of rapid release
(6) in the media communication process, speech quality is all constantly detected at the communication two ends, when the recipient finds to receive message owing to packet loss, shakes to wait to cause speech quality to be reduced to certain value, then notifies initiatively initiator's toggle path.When the active initiator finds to receive the reduction of the other side's message communication quality, then initiatively initiate the switching in path
When (7) switch in the path, keep current communication path, in the detection process, when finding than the better path of current path, then switch message transmissions to better path, handoff procedure is until detection finishes selected optimal path
(8) in the media communication process,, can repeatedly switch according to the detection of application layer to speech quality
(9) application layer need be assessed talk path behind end of conversation, and the result of assessment feeds back to the P2P module
(10) the P2P module when selecting path and FN, needed with reference to former assessment result next time with identical opposite end address communication the time.
Beneficial effect
The invention solves the real-time of the ensuring the quality of products transmission difficult problem that VoIP runs in the P2P network, can improve the quality of VoIP communication greatly, and can solve the difficult problem that network is closed down.When media delivery is interrupted or after network quality drops to a certain degree, the P2P network will be reselected optimal transmission paths, guarantee the quality of VoIP communication.
Description of drawings
Fig. 1 is the P2P method flow diagram of support VoIP of the present invention communication.
Embodiment
Referring to accompanying drawing.Network in the accompanying drawing has comprised NN, FN, and SN, these P2P nodes of CN simultaneously, have also comprised the VoIP terminal, soft switch and media gateway.
SN-1, the super node in the SN-2:P2P network is in charge of the registration of NN, the distribution of FN, tactful issues
FN-1, the forward node in the FN-2:P2P network is responsible for NN the service of forwarding is provided
NN-1, NN-2, NN-3, NN-4, NN-5, the ordinary node in the NN-6:P2P network also is simultaneously the member in the VoIP system.Wherein:
NN-1, NN-2, NN-3, the terminal in the corresponding VoIP system of NN-4.
Soft switch in the corresponding VoIP system of NN-5.
Media gateway in the corresponding VoIP system of NN-6.
1, whole P2P network is divided into 3 layers of 4 kinds of role
1-1,3 layers are respectively the ordinary node layer, super node layer, Centroid layer.
1-2,4 kinds of roles are respectively:
NN: ordinary node, the service of forwarding is not provided, only enjoy service, need be registered to SN.
FN: forward node at first is NN, and the service of forwarding is provided simultaneously, need be registered to SN.
SN: super node, accept the registration of NN/FN, need be registered to CN.
Centroid in the CN:P2P network is responsible to define various rules and strategy, also is responsible for the information exchange between SN-1 and the SN-2 simultaneously.Accept the registration of SN, the FN tabulation of management the whole network issues the FN SN that tabulates, and distributing policy is to NN/FN.
1-3, ordinary node layer are made up of all NN/FN, and the super node layer is made up of all SN, and CN is the Centroid layer.
2, the embedded P2P network function module of VoIP node has P2P function and VoIP communication function simultaneously.
3, the VoIP node need join in the P2P network, becomes one of them node, and has corresponding role according to different condition.
When 4, the VoIP node was registered to soft switch, the P2P network was set up an optimal transmission paths between node and soft switch, and kept this path to continue to exist.Call control signalling between follow-up VoIP node and soft switch all passes through this path transmission.
5, between the VoIP node when calling out between soft switch, the P2P information of node exchanges by communication signaling, the P2P network is dynamically set up optimal transmission paths and is carried out media flow transmission between the VoIP node.
6, the P2P network can carry out the path switching as required or reselect optimal path, release way behind the end of calling when media stream.
7, SN in the P2P network and CN can independently be provided with, and are specified by management system
The VoIP node can only become NN or FN in the P2P network:
After 7-1, VoIP node power on, all be the role of NN initially.
7-2, NN detect the network quality of SN, select the time delay minimum, and the minimum SN of packet loss registers, and after succeeding in registration, obtain the P2P strategy from SN, and strategy comprises the strategy of selecting transmission path, becomes the condition of FN etc.
Behind 7-3, the NN stable operation strategy official hour, judge whether to satisfy the condition become FN, the condition that becomes FN comprises the network insertion type at own place, public network whether, remaining bandwidth size etc.If satisfy, then become FN, and report SN.
7-4, SN report CN with FN information, and are diffused into the SN of the whole network, add to transmit the Resources list.
Network between 7-5, NN/FN monitoring and the SN connects situation, has no progeny in NN/FN and SN contact, and NN/FN reselects the SN registration.
8, SN monitors the network connection state of all FN, and after FN and SN got in touch interruption, SN reported CN to circulate a notice of on the SN of the whole network, this FN of deletion from transmit the Resources list.
9, CN exchanges information between the SN in the P2P network, issues various strategies.
10, management system can issue various strategies by SN/CN, and strategy includes but not limited to:
10-1, path network quality policy mainly are network delays, packet loss, and the parameter area of shake, and these parameters account for percentage when the assessment network quality
10-2, routing strategy mainly are to transmit the strategy of communication when selecting between node between direct communication or node, comprise straight-through preferentially, transmit preferentially, only allow straight-throughly, only allow to transmit, and be straight-through and transmit fair competition etc.
10-3, agreement selection strategy mainly are how to select when using UDP communication or TCP communication, comprise only allowing UDP, and only allow TCP, UDP is preferential, and TCP is preferential, UDP/TCP fair competition etc.
The NN of 10-4, the overall situation is converted into the strategy of FN, comprises the minimum duration of necessary stable operation, minimum remaining bandwidth, and which kind of network access mode whether forbid becoming FN etc.
10-5, specify the strategy that becomes FN, the same 10-4 of content at single NN
The FN forwarding strategy of 10-6, the overall situation comprises specifying and transmits the maximum bandwidth of using that max-forwards linking number, fixed port still are dynamic port scope etc.
10-7, at single FN forwarding strategy, the same 10-6 of content
11, for internodal signaling flow, the same path of P2P network using is carried out multiplexing, the different shared fully same path transmission of signaling flow between two nodes just, and keep this transmission path for a long time.
12, for internodal Media Stream, the P2P network gets access to P2P information from call signaling after, dynamically set up a transmission paths, the rule of foundation is exactly to select according to the various strategies that CN issues, and the Dynamic Selection step is as follows:
Whether 12-1, inspection this locality have had to the record of the communication of opposite end
12-2, check these communications records whether in the regular hour scope, if, and transmission quality is good, so directly sets up transmission channel according to communications records
If the 12-3 communications records do not exist or overtime scope or transmission quality are undesirable, then, from the FN forwarding list of this locality, choose optimum FN, survey the communication quality to the opposite end then, and survey simultaneously without the detection quality in the path of FN by these FN.
In 12-4, the detection process, choose the path media stream of response at first earlier, and in detection process, constantly switch to best path transmission
12-5, survey to finish after, choose optimal transmission paths according to strategy, and switch to optimal transmission paths and transmit
12-6, carry out according to the Media layer demand that switch in the path or rerouting.Media layer can if quality is reduced to a certain degree, then can notify the P2P network to switch according to the statistics of medium.If media delivery is interrupted, then require the P2P network to switch or rerouting.
12-7, media communication finish, and notice P2P network discharges this transmission path.
After 12-8, detection finish, the network based detection event of P2P, whether decision upgrades forwarding list to the SN application.
13,, can avoid in the network direct communication to some node by the forwarding capability of FN
14,, make and close down inefficacy for the network of some node owing to internodal indirect communication.
Concrete enforcement is as follows: its concrete steps are as follows:
(1) at SN-1, the address information of the last configuration of SN-2 CN, SN-1, SN-2 are registered on the CN;
(2) on all NN,, get access to the address information of SN-1 and SN-2 by configuration or other modes;
(3) NN surveys SN-1 and SN-2, selects the SN of the most suitable registration to register, NN-1 wherein, and NN-3, FN-1 have been registered to SN-1, and NN-2 and NN-4, NN-5, NN-6, FN-2 then have been registered on the SN-2;
(4) after NN joined in the P2P network, the VoIP terminal then needed to be registered to soft switch, NN-1, NN-2, NN-3, NN-4, FN-1, FN-2 is corresponding VoIP terminal simultaneously, therefore, need register to the soft switch of NN-5 correspondence, registration process selects for use NN-1 to be used as example;
(5) application layer of the VoIP terminal of NN-1 correspondence by the NN-1 mixed-media network modules mixed-media, sends protocol massages to the VoIP of NN-5 soft switch application layer, and agreement can be SIP, H323 or any agreement;
(6) after the P2P mixed-media network modules mixed-media of NN-1 receives the transmission request of application layer, check the virtual route of finding also not to be established to NN-5, therefore, NN-1 transmits FN the Resources list to the SN-1 application;
(7) after SN-1 receives the request of NN-1, distributed FN-1 and FN-2 forward node to give NN-1 according to certain rule and strategy;
(8) NN-1 receives FN-1, behind the FN-2 forward node, has been combined into 3 virtual routes, is respectively 1) NN-1 ← → NN-5,
2) NN-1 ← → FN-1 ← → NN-5,3) NN-1 ← → FN-2 ← → NN-5, this 3 paths is carried out the path surveys;
(9) receive the path 1 of probe response at first), as interim transmitting-receiving path, signaling message sends to the application layer of NN-5;
(10), survey to finish the back in 81 according to rule and tactful), 2), 3) and three paths assess, the assessment content comprises time delay, packet loss, shake, selected at last path (3) is an optimal path, and the transmitting-receiving of signaling message switches to path 3), release way 1) and 2) resource that takies
(11) application layer of NN-1 is initiated the call request to NN-5, and selected NN-6 of NN-5 soft switch and NN-1 communicate, and in communication signaling NN-6 information are taken back to NN-1;
(12) NN-1 is NN-1, FN-1, FN-2, NN-6 information makes up, obtain equally three paths (a) NN-1 ← → NN-6,
(b)NN-1←→FN-1←→NN-6，(c)NN-1←→FN-2←→NN-6；
(13) NN-1 surveys this three paths, and the path (c) of receiving response at first begins the transmission of Media Stream as temporary path;
(14) after detection finishes, the strategy of synthetic media flow transmission, selected path (b) is an optimal path, media flow transmission switches to path (b) and transmits;
(15) NN-1 and NN-6 application layer communicate the monitoring of quality for Media Stream;
(16) behind the sign off, the NN-1 application layer is assessed speech quality, and assessment result feeds back to the P2P mixed-media network modules mixed-media of NN-1, when next media delivery, is used for reference.
The present invention has proposed a kind of P2P method of supporting real-time VoIP transmission, can high-quality assurance VoIP real-time media transmission.After to research and analysis of the present invention; increase the type of the content of P2P transmission; increase/change NN/FN combination of paths mode; the mode that the path is surveyed; new assessment strategy is proposed; and the strategy of path switching etc., can the P2P method that the present invention proposes be improved, but these improve still within claim protection range of the present invention.
Claims (4)
1. a P2P method of supporting VoIP communication comprises P2P network construction and Path selection and foundation, and whole P2P network is divided into 3 layers of 4 kinds of role, it is characterized in that,
1-1,3 layers are respectively ordinary node layer, super node layer and Centroid layer;
1-2,4 kinds of roles' P2P node is respectively:
NN: ordinary node, the service of forwarding is not provided, only enjoy service, need be registered to SN;
FN: forward node at first is NN, and the service of forwarding is provided simultaneously, need be registered to SN;
SN: super node, accept the registration of NN/FN, need be registered to CN;
Centroid in the CN:P2P network is responsible to define various rules and strategy, also is responsible for simultaneously the information exchange between SN-1 and the SN-2, accepts the registration of SN, and the FN tabulation of management the whole network issues the FN SN that tabulates, and distributing policy is to NN/FN;
Relation between 1-3, layer and the role is as follows:
(1) all NN/FN form the ordinary node layer;
(2) all SN form the super node layer;
(3) all CN organization center node layer;
Wherein, the process of described P2P network construction is:
(1) in order effectively to carry out addressing and to select path efficiently, need to set up the P2P network, this network needs at least one SN node, when surpassing a SN node, needs to increase the CN node;
(2) each VoIP terminal, soft switch, media gateway all are nodes in this network, below all are called for short node;
(3) each node has all disposed one or more SN information;
(4) all node initializing roles are NN, according to the SN information that oneself obtains, select a SN to register;
(5) after NN succeeds in registration, SN will issue various strategies to NN, if management level have independently strategy at certain NN, then issue corresponding independent strategies, if independently not tactful, then issue general policies;
(6) NN is after receiving the strategy of SN, and whether oneself can provide transmit service, if the service of forwarding can be provided, then notify SN oneself to become FN, and the idle bandwidth that oneself can provide resource is provided if judging;
(7) after SN finds that NN becomes FN, notify all SN FN information;
(8) when SN and NN contact interruption, NN selects other SN registration, and SN then notifies certain FN of other SN to interrupt;
The process of described Path selection and foundation is:
(1) the VoIP terminal is when the soft switch signaling is communicated by letter, and NN finds not foundation of path, then to SN application FN resource;
(2) after NN obtains the FN resource, with survey NN ← → path between soft switch, NN ← → FN ← → path between the soft switch;
(3) according to result of detection, the strategy that uses SN to issue is chosen a best paths, for signaling, keeps this path for a long time;
(4), need the quality of real-time inspection network service, in case find that communication quality descends or network service is interrupted for Media Stream, then select a paths communication fast, and select other available path simultaneously, choose optimal path after, switch to optimal path and communicate;
(5) after media communication finishes, need all resources on this path of rapid release;
(6) in the media communication process, speech quality is all constantly detected at the communication two ends, when the recipient finds to receive message owing to packet loss, shake cause speech quality to be reduced to certain value, then notify initiatively initiator's toggle path, when the active initiator finds to receive the reduction of the other side's message communication quality, then initiatively initiate the switching in path;
When (7) switch in the path, keep current communication path, in the detection process, when finding than the better path of current path, then switch message transmissions to better path, handoff procedure is until detection finishes selected optimal path;
(8) in the media communication process,, can repeatedly switch according to the detection of application layer to speech quality;
(9) application layer need be assessed talk path behind end of conversation, and the result of assessment feeds back to the P2P module;
(10) the P2P module when selecting path and FN, needed with reference to former assessment result next time with identical opposite end address communication the time.
2. the P2P method of support according to claim 1 VoIP communication is characterized in that, described NN, FN, SN node are as follows:
SN-1, the super node in the SN-2:P2P network is in charge of the registration of NN, the distribution of FN, strategy issue FN-1;
Forward node in the FN-2:P2P network is responsible for NN the service of forwarding is provided;
NN-1, NN-2, NN-3, NN-4, NN-5, the ordinary node in the NN-6:P2P network also is simultaneously the member in the VoIP system, wherein:
NN-1, NN-2, NN-3, the terminal in the corresponding VoIP system of NN-4;
Soft switch in the corresponding VoIP system of NN-5;
Media gateway in the corresponding VoIP system of NN-6.
3. the P2P method of support VoIP according to claim 1 communication is characterized in that,
The embedded P2P network function module of VoIP node has P2P function and VoIP communication function simultaneously;
The VoIP node need join in the P2P network, becomes one of them node, and has corresponding role according to different condition;
When the VoIP node was registered to soft switch, the P2P network was set up an optimal transmission paths between node and soft switch, and kept this path to continue to exist, and the call control signalling between follow-up VoIP node and soft switch all passes through this path transmission;
When calling out between soft switch, the P2P information of node exchanges by communication signaling between the VoIP node, and the P2P network is dynamically set up optimal transmission paths and carried out media flow transmission between the VoIP node.
4. P2P method of supporting VoIP communication, its concrete steps are as follows:
(1) at SN-1, the address information of the last configuration of SN-2 CN, SN-1, SN-2 are registered on the CN;
(2) on all NN,, get access to the address information of SN-1 and SN-2 by configuration or other modes;
(3) NN surveys SN-1 and SN-2, selects the SN of the most suitable registration to register, NN-1 wherein, and NN-3, FN-1 have been registered to SN-1, and NN-2 and NN-4, NN-5, NN-6, FN-2 then have been registered on the SN-2;
(4) after NN joined in the P2P network, the VoIP terminal then needed to be registered to soft switch, NN-1, NN-2, NN-3, NN-4, FN-1, FN-2 is corresponding VoIP terminal simultaneously, therefore, need register to the soft switch of NN-5 correspondence, registration process selects for use NN-1 to be used as example;
(5) application layer of the VoIP terminal of NN-1 correspondence by the NN-1 mixed-media network modules mixed-media, sends protocol massages to the VoIP of NN-5 soft switch application layer, and agreement is SIP, H323 or other agreement;
(6) after the P2P mixed-media network modules mixed-media of NN-1 receives the transmission request of application layer, check the virtual route of finding also not to be established to NN-5, therefore, NN-1 transmits FN the Resources list to the SN-1 application;
(7) after SN-1 receives the request of NN-1, distributed FN-1 and FN-2 forward node to give NN-1 according to certain rule and strategy;
(8) NN-1 receives FN-1, behind the FN-2 forward node, has been combined into 3 virtual routes, is respectively: 1) NN-1 ← → NN-5,2) NN-1 ← → FN-1 ← → NN-5,3) NN-1 ← → FN-2 ← → NN-5, this 3 paths is carried out the path surveys;
(9) receive the path 1 of probe response at first), as interim transmitting-receiving path, signaling message sends to the application layer of NN-5;
(10), survey to finish the back in (8) 1 according to rule and tactful), 2), 3) and three paths assess, the assessment content comprises time delay, packet loss, shake, selected at last path 3) be optimal path, the transmitting-receiving of signaling message switches to path 3), release way 1) and 2) resource that takies;
(11) application layer of NN-1 is initiated the call request to NN-5, and selected NN-6 of NN-5 soft switch and NN-1 communicate, and in communication signaling NN-6 information are taken back to NN-1;
(12) NN-1 is NN-1, FN-1, FN-2, NN-6 information makes up, obtain equally three paths (a) NN-1 ← → NN-6, (b) NN-1 ← → FN-1 ← → NN-6, (c) NN-1 ← → FN-2 ← → NN-6;
(13) NN-1 surveys this three paths, and the path (c) of receiving response at first begins the transmission of Media Stream as temporary path;
(14) after detection finishes, the strategy of synthetic media flow transmission, selected path (b) is an optimal path, media flow transmission switches to path (b) and transmits;
(15) NN-1 and NN-6 application layer communicate the monitoring of quality for Media Stream;
(16) behind the sign off, the NN-1 application layer is assessed speech quality, and assessment result feeds back to the P2P mixed-media network modules mixed-media of NN-1, when next media delivery, is used for reference.
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| CN101938521B (en) * | 2010-09-10 | 2012-11-21 | 华中科技大学 | Method for transmitting signaling in VoIP system |
| CN102868683B (en) * | 2012-08-23 | 2015-06-03 | 东南大学 | Terminal-to-terminal based voice safety multi-path communication system and method |
| CN103718532A (en) * | 2013-03-26 | 2014-04-09 | 华为技术有限公司 | Data transmission method, apparatus and terminal device |
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| CN111800516B (en) * | 2020-08-09 | 2021-01-08 | 物鼎安全科技(武汉)有限公司 | Internet of things equipment management method and device based on P2P |
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| US20080076409A1 (en) * | 2006-08-31 | 2008-03-27 | Skype Limited | Wireless device for voice communication |
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