CN108769441B - Soft switch conversation method and system - Google Patents
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- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
- H04M7/0072—Speech codec negotiation
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- H—ELECTRICITY
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- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
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Abstract
The invention provides a soft switch call method and a system, belongs to the technical field of soft switch calls, and can at least partially solve the problem that the existing soft switch call technology is difficult to select voice codes. The soft switch communication method of the invention comprises the following steps: in the communication process of the first end and the second end, the network quality of a network channel is obtained, and the voice codes of the first end and the second end are selected according to the network quality; judging whether the voice codes of the first end and the second end are the same; if the speech codes of the first end and the second end are different, the conversation between the first end and the second end is realized in a relay mode, and the method comprises the following steps: the voice coding repeater receives the voice stream of the first end, converts the voice stream into the voice coding form of the second end and sends the voice stream to the second end, and receives the voice stream of the second end, converts the voice stream into the voice coding form of the first end and sends the voice stream to the first end.
Description
Technical Field
The invention belongs to the technical field of soft switch communication, and particularly relates to a soft switch communication method and system.
Background
Soft Switch (Soft Switch) is a technology based on packet network that separates call control function from media processing by program control software, and its basic meaning is to separate call control function from media gateway (transport layer), and to realize call control function by software, thus realizing separation of call transmission and call control, and establishing a separate plane for control, Switch and software programmable function.
The network of the soft switch architecture mainly comprises soft switch equipment, a relay gateway TG, a signaling gateway SG and an access gateway AG. The soft switch device mainly provides functions of connection control, translation and routing, gateway management, call control, bandwidth management, signaling, security, call detailed record and the like, and meanwhile, the soft switch device also encapsulates network resources and network capacity and is connected with a service application layer through a standard open service interface, so that new services can be conveniently and rapidly provided on the network. The relay gateway TG is capable of performing functions such as media stream conversion, and is mainly used for relay access, and provides media mapping and transcoding functions between an IP network and a circuit switched network (PSTN), i.e., terminating circuit switched network facilities (trunk lines, loops, etc.), packetizing media streams, and transmitting the packetized media streams over a packet network. The access gateway AG is used to directly access the user terminal to an IP packet network (e.g. a normal analog user, ISDN, etc.), and provides media mapping and transcoding functions between the IP network and the user terminal, packetizes the media stream and transmits the packetized media stream over the packet network. The signaling gateway SG completes the conversion function of the signaling between the circuit switching network and the packet switching network (based on IP), and can effectively realize the signaling intercommunication between the circuit switching network and the packet network, the signaling gateway SG receives and sends standard SS7 signaling messages at the circuit switching network side, and an adaptation layer protocol and a transport layer protocol of an IETF signaling transfer working group (SIGTRAN) standard are adopted at the packet network side.
Due to the nature of the soft switch technology, the soft switch speech quality is affected by the network quality of the network channel, and sometimes the network quality cannot meet the requirement of speech coding, and sometimes the speech coding cannot fully utilize the network channel. Especially, when the calling terminal and the called terminal use different speech coding, the soft switch call cannot be realized.
Disclosure of Invention
The invention at least partially solves the problem that the existing soft switch communication technology is difficult to select the voice coding, and provides a soft switch communication method and a system which can select proper voice coding according to the requirement and can realize communication under the condition that different voice coding is adopted at two ends.
The technical scheme adopted for solving the technical problem of the invention is a soft switch conversation method, which comprises the following steps:
in the communication process of the first end and the second end, the network quality of a network channel is obtained, and the voice codes of the first end and the second end are selected according to the network quality;
judging whether the voice codes of the first end and the second end are the same;
if the speech codes of the first end and the second end are different, the conversation between the first end and the second end is realized in a relay mode, and the method comprises the following steps: the voice coding repeater receives the voice stream of the first end, converts the voice stream into the voice coding form of the second end and sends the voice stream to the second end, and receives the voice stream of the second end, converts the voice stream into the voice coding form of the first end and sends the voice stream to the first end.
Preferably, before the first end and the second end communicate, the method further comprises:
acquiring the network quality of a network channel, and selecting the voice codes of the first end and the second end according to the network quality;
judging whether the voice codes of the first end and the second end are the same;
if the voice codes of the first end and the second end are different, the conversation between the first end and the second end is realized in a relay mode.
Preferably, when the first end and the second end talk in a relay manner, the acquiring the network quality of the network channel and selecting the voice codes of the first end and the second end according to the network quality includes:
the first end sends a network channel quality test packet to the voice coding repeater so as to obtain the network quality, and selects the voice coding of the first end according to the network quality; and the second end sends a network channel quality test packet to the voice coding repeater so as to acquire the network quality, and selects the voice coding of the second end according to the network quality.
Preferably, if the speech coding of the first end and the second end is the same, the first end and the second end directly communicate through the network channel.
Preferably, when the first end and the second end are not talking in a relay manner, the acquiring the network quality of the network channel and selecting the voice coding of the first end and the second end according to the network quality includes:
the first end sends a network channel quality test packet to the second end to obtain the network quality, selects the own voice code according to the network quality, and simultaneously sends the selected voice code to the second end, and the second end adopts the received voice code.
Preferably, the network quality of the network channel includes:
at least one of time delay, jitter and packet loss rate.
The technical scheme adopted for solving the technical problem of the invention is a soft switch communication system, which comprises:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the network quality of a network channel in the conversation process of a first end and a second end and selecting the voice codes of the first end and the second end according to the network quality;
the judging unit is used for judging whether the voice codes of the first end and the second end are the same or not;
the voice coding repeater is used for realizing the conversation between the first end and the second end in a relay mode when the voice coding of the first end and the voice coding of the second end are different, and is specifically used for receiving the voice stream of the first end, converting the voice stream into the voice coding form of the second end and sending the voice stream to the second end, receiving the voice stream of the second end, converting the voice stream into the voice coding form of the first end and sending the voice stream to the first end.
Preferably, the obtaining unit further obtains the network quality of the network channel before the first end and the second end are in communication, and selects the voice codes of the first end and the second end according to the network quality.
Preferably, the softswitch call system further comprises:
and the soft switch equipment is used for enabling the first end and the second end to directly communicate through the network channel when the voice codes of the first end and the second end are the same.
Preferably, the network quality of the network channel includes:
at least one of time delay, jitter and packet loss rate.
In the soft switch communication method, the network quality can be obtained, and the voice codes at two ends are correspondingly adjusted according to the network quality, so that the voice codes are the best voice codes which can be realized under the current network quality, and the communication quality is improved; meanwhile, when the voice codes at two ends are different, the voice code repeater can be used for realizing the conversion of the voice codes, thereby realizing the soft switch conversation between the devices adopting different voice codes.
Drawings
Fig. 1 is a flowchart illustrating a soft switch call method according to an embodiment of the present invention;
FIG. 2 is a flow chart of another soft switch call method according to an embodiment of the present invention;
fig. 3 is a block diagram of a soft switch telephone system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
as shown in fig. 1, the present embodiment provides a soft switch call method, which includes:
s101, in the process of communication between the first end and the second end, the network quality of the network channel is obtained, and the voice codes of the first end and the second end are selected according to the network quality.
S102, judging whether the voice codes of the first end and the second end are the same.
S103, if the voice codes of the first end and the second end are different, the conversation between the first end and the second end is realized in a relay mode, and the conversation comprises the following steps: the voice coding repeater receives the voice stream of the first end, converts the voice stream into the voice coding form of the second end and sends the voice stream to the second end, and receives the voice stream of the second end, converts the voice stream into the voice coding form of the first end and sends the voice stream to the first end.
In the soft switch communication method of the embodiment, the network quality can be acquired and the voice codes at the two ends are correspondingly adjusted according to the network quality, so that the voice codes are the best possible voice codes which can be realized under the current network quality, and the communication quality is improved; meanwhile, when the voice codes at two ends are different, the voice code repeater can be used for realizing the conversion of the voice codes, thereby realizing the soft switch conversation between the devices adopting different voice codes.
Example 2:
as shown in fig. 2, the present embodiment provides a soft switch call method, which includes:
s201, before the first end and the second end are communicated, the network quality of a network channel is obtained, and the voice codes of the first end and the second end are selected according to the network quality.
S202, judging whether the voice codes of the first end and the second end are the same.
S203, if the voice codes of the first end and the second end are different, the conversation between the first end and the second end is realized in a relay mode; if the voice codes of the first end and the second end are the same, the first end and the second end directly communicate through a network channel.
S204, in the process of the conversation between the first end and the second end, the network quality of the network channel is obtained, and the voice codes of the first end and the second end are selected according to the network quality.
S205, judging whether the voice codes of the first end and the second end are the same.
S206, if the voice codes of the first end and the second end are different, the conversation between the first end and the second end is realized in a relay mode; if the voice codes of the first end and the second end are the same, the first end and the second end directly communicate through a network channel.
Wherein, the first end and the second end directly communicate through a network channel and comprise: the voice coding repeater receives the voice stream of the first end, converts the voice stream into the voice coding form of the second end and sends the voice stream to the second end, and receives the voice stream of the second end, converts the voice stream into the voice coding form of the first end and sends the voice stream to the first end.
Preferably, when the first end and the second end talk in a relay manner, acquiring the network quality of the network channel, and selecting the speech coding of the first end and the second end according to the network quality includes:
the first end sends a network channel quality test packet to the voice coding repeater so as to obtain the network quality, and selects the voice coding of the first end according to the network quality; and the second end sends a network channel quality test packet to the voice coding repeater so as to acquire the network quality, and selects the voice coding of the second end according to the network quality.
Preferably, when the first end and the second end are not talking in a relay manner, acquiring the network quality of the network channel, and selecting the speech coding of the first end and the second end according to the network quality includes:
the first end sends a network channel quality test packet to the second end to obtain the network quality, selects the own voice code according to the network quality, and simultaneously sends the selected voice code to the second end, and the second end adopts the received voice code.
Preferably, the network quality of the network channel includes: at least one of time delay, jitter and packet loss rate.
In the soft switch communication method of the embodiment, before starting communication, the network quality is detected, and a proper voice code (i.e. the best voice code allowed by the current network quality) is selected according to the network quality, so that communication can be started by adopting the proper voice code, wherein if the voice codes selected at the two ends are the same, the two ends can be directly connected with communication through a network channel; if the speech codes selected by the two ends are different (if the two have no same speech code at all), the speech code repeater is used as a relay to convert the speech code into the speech code adopted by the opposite end, so as to realize indirect conversation.
During the conversation, the network quality can be detected in real time, and the proper voice coding can be selected again when the network quality changes. Of course, after the reselection, it can still determine whether the two terminals are directly talking through the network channel or talking in the relay mode according to whether the voice codes are the same or not.
When two ends communicate in a relay mode, the two ends are connected with the voice coding repeater through different network channels, so that the two ends have different network qualities, and therefore the two ends should send channel quality test packets to the voice coding repeater respectively to determine the respective network qualities and select voice codes suitable for the two ends respectively.
When the two ends do not adopt the above relay communication mode (such as before the communication is started or when the communication is directly carried out through the network channel), the two ends are connected through a network communication and have the same network quality, so that the network quality can be determined by sending a network channel quality test packet to the other end through any one end, and the two ends can select the same voice code.
Specifically, the following specifically describes the above method by taking an access gateway AG1 with a first end as a calling user and an access gateway AG2 with a second end as a called user, and taking the network quality including time delay, jitter, and packet loss rate as an example. The soft switch call method comprises the following steps:
1. the softswitch sends a Modify command to the AG1, i.e., a Termination is established in the Null Context, waiting for an off-hook event.
2. The softswitch sends a Modify command to the AG2, i.e., a Termination is established in the Null Context, waiting for an off-hook event.
3. The calling subscriber takes the hook and the AG1 sends a Notify command to the softswitch reporting the hook event.
4. The softswitch sends Modify command to AG1 to wait for the user to input the called number and the calling user to listen to the dial tone.
5. The soft switch equipment analyzes the called number, finds that the called number corresponds to AG2, sends the IP address of AG1 to AG2, and prompts AG2 to put ringing tone.
6. The softswitch sends the IP address of AG2 to AG1 prompting AG1 to put back a ring tone.
7. Create a new Context in AG1, and add TDM Termination and RTP Termination to the Context, where Mode is set to SendReceive, and set jitter buffer, etc.
8. AG1 sends end-to-end network channel quality test packets to AG2, testing the network quality between AG1 and AG 2.
9. The AG1 selects an appropriate speech coding (e.g., the best speech coding allowed by the current network quality) according to the tested network quality, and sends the RTP port number and the speech coding to the soft switch device.
10. The softswitch sends the RTP port number and the speech coding of AG1 to AG 2.
11. Create a new Context in AG2, and add TDM Termination and RTP Termination to the Context, where Mode is set to SendReceive, and set jitter buffer, etc. When AG2 does not support the received voice coding of AG1, AG2 sends its RTP port number and all the voice coding supported to the softswitch.
12. The softswitch sends the RTP port number of AG2 and all supported vocoding to AG 1.
13. The AG1 discovers that all the vocodings supported by AG2 are not supported by itself and sends a message to the softswitch to activate the vocoding relay.
14. The softswitch issues a message to the AG2 to activate the vocoding relay.
15. The AG1 sends an end-to-end network channel quality test packet to the vocoder relay, testing the network quality between it and the vocoder relay.
16. The AG1 selects an appropriate speech code according to the tested network quality, and sends the RTP port number and the speech code to the speech coding repeater.
17. The AG2 sends an end-to-end network channel quality test packet to the vocoder relay, testing the network quality between it and the vocoder relay.
18. The AG2 selects an appropriate speech code according to the tested network quality, and sends the RTP port number and the speech code to the speech coding repeater.
19. The called party picks up the phone and the softswitch cuts off the ring tone of the called party and informs the AG1 to cut off the ring back tone of the calling party.
20. The AG1 establishes a connection with the speech coding repeater.
21. The AG2 establishes a connection with the speech coding repeater.
22. The voice coding repeater converts the voice coding of the AG1 and the voice coding of the AG2, and realizes the communication between the AG1 and the AG 2.
Specifically, when the voice coding repeater receives the voice stream from AG1 (with the voice coding of AG 1), it converts it into a voice coded voice stream with AG2, and then forwards it to AG 2; when the vocoding repeater receives the voice stream from AG2 (vocoded using AG 2), it converts it to a voice-encoded voice stream using AG1 and then forwards it to AG 1.
23. The AG1 continues to send network quality test packets to the vocoder relay during the course of the call.
When the network quality is tested to be improved and the AG1 has the better speech code to choose, the AG1 sends a notification to the speech coding repeater to change the speech code, and the AG1 and the speech coding repeater continue the call after changing the speech code.
When the network quality is tested to be reduced and the AG1 has the voice code requiring less network bandwidth to select, the AG1 sends a change voice code notification to the voice code relay, and the AG1 and the voice code relay continue to talk after changing the voice code.
24. The AG2 continues to send network quality test packets to the vocoder relay during the course of the call.
When the network quality is tested to be improved and the AG2 has the better speech code to choose, the AG2 sends a notification to the speech coding repeater to change the speech code, and the AG2 and the speech coding repeater continue the call after changing the speech code.
When the network quality is tested to be reduced and the AG2 has the voice code requiring less network bandwidth to select, the AG2 sends a change voice code notification to the voice code relay, and the AG2 and the voice code relay continue to talk after changing the voice code.
Example 3:
as shown in fig. 3, the present embodiment provides a soft switch call system, which includes:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the network quality of a network channel in the conversation process of a first end and a second end and selecting the voice codes of the first end and the second end according to the network quality;
the judging unit is used for judging whether the voice codes of the first end and the second end are the same or not;
the voice coding repeater is used for realizing the conversation between the first end and the second end in a relay mode when the voice coding of the first end and the voice coding of the second end are different, and is specifically used for receiving the voice stream of the first end, converting the voice stream into the voice coding form of the second end and sending the voice stream to the second end, receiving the voice stream of the second end, converting the voice stream into the voice coding form of the first end and sending the voice stream to the first end.
Preferably, the obtaining unit is further configured to obtain the network quality of the network channel before the first end and the second end are in a call, and select the vocoding of the first end and the second end according to the network quality.
Preferably, the softswitch call system further comprises: and the soft switch equipment is used for enabling the first end and the second end to directly communicate through the network channel when the voice codes of the first end and the second end are the same.
Preferably, the network quality of the network channel includes: at least one of time delay, jitter and packet loss rate.
The soft switch communication system of the embodiment can realize the above soft switch communication method, so that the best possible voice coding can be selected and the soft switch communication can be realized.
Specifically, the above soft switch communication system may include a plurality of end (e.g. a plurality of access gateways), soft switch devices, voice coding repeaters, and other physical devices, and the above obtaining unit, determining unit, and the like may be functions or modules of these devices, or may be independent devices or modules.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A method for softswitch telephony, comprising:
in the communication process of the first end and the second end, the network quality of a network channel is obtained, and the voice codes of the first end and the second end are selected according to the network quality;
judging whether the voice codes of the first end and the second end are the same;
if the speech codes of the first end and the second end are different, the conversation between the first end and the second end is realized in a relay mode, and the method comprises the following steps: the voice coding repeater receives the voice stream of the first end, converts the voice stream into the voice stream of the voice coding form of the second end and sends the voice stream to the second end, and receives the voice stream of the second end, converts the voice stream into the voice stream of the voice coding form of the first end and sends the voice stream to the first end;
when the first end and the second end are in call in a relay mode, the acquiring the network quality of the network channel and selecting the voice codes of the first end and the second end according to the network quality comprises the following steps:
the first end sends a network channel quality test packet to the voice coding repeater so as to obtain the network quality, and selects the voice coding of the first end according to the network quality; the second end sends a network channel quality test packet to the voice coding repeater so as to acquire the network quality, and selects the voice coding of the second end according to the network quality;
when the first end and the second end are not in a call in a relay mode, the acquiring the network quality of the network channel and selecting the voice codes of the first end and the second end according to the network quality comprises the following steps:
the first end sends a network channel quality test packet to the second end to acquire network quality, selects a voice code of the first end according to the network quality, and sends the selected voice code to the second end, wherein the second end adopts the received voice code;
the network quality of the network channel comprises:
at least one of time delay, jitter and packet loss rate.
2. The soft switch call method of claim 1, further comprising, before the first end and the second end are called, the steps of:
acquiring the network quality of a network channel, and selecting the voice codes of the first end and the second end according to the network quality;
judging whether the voice codes of the first end and the second end are the same;
if the voice codes of the first end and the second end are different, the conversation between the first end and the second end is realized in a relay mode.
3. The soft switch call method of claim 1,
if the voice codes of the first end and the second end are the same, the first end and the second end directly communicate through a network channel.
4. A softswitch telephony system, comprising:
the device comprises an acquisition unit, a processing unit and a processing unit, wherein the acquisition unit is used for acquiring the network quality of a network channel in the conversation process of a first end and a second end and selecting the voice codes of the first end and the second end according to the network quality;
the judging unit is used for judging whether the voice codes of the first end and the second end are the same or not;
the voice coding repeater is used for realizing the conversation between the first end and the second end in a relay mode when the voice coding of the first end and the voice coding of the second end are different, and is specifically used for receiving the voice stream of the first end, converting the voice stream into the voice coding form of the second end and sending the voice stream to the second end, receiving the voice stream of the second end, converting the voice stream into the voice coding form of the first end and sending the voice stream to the first end;
when the first end and the second end are in call in a relay mode, the acquiring the network quality of the network channel and selecting the voice codes of the first end and the second end according to the network quality comprises the following steps:
the first end sends a network channel quality test packet to the voice coding repeater so as to obtain the network quality, and selects the voice coding of the first end according to the network quality; the second end sends a network channel quality test packet to the voice coding repeater so as to acquire the network quality, and selects the voice coding of the second end according to the network quality;
when the first end and the second end are not in a call in a relay mode, the acquiring the network quality of the network channel and selecting the voice codes of the first end and the second end according to the network quality comprises the following steps:
the first end sends a network channel quality test packet to the second end to acquire network quality, selects a voice code of the first end according to the network quality, and sends the selected voice code to the second end, wherein the second end adopts the received voice code;
the network quality of the network channel comprises:
at least one of time delay, jitter and packet loss rate.
5. The softswitch telephony system of claim 4,
the acquiring unit is further configured to acquire the network quality of the network channel before the first end and the second end are in communication, and select the voice codes of the first end and the second end according to the network quality.
6. The softswitch telephony system of claim 4, further comprising:
and the soft switch equipment is used for enabling the first end and the second end to directly communicate through the network channel when the voice codes of the first end and the second end are the same.
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| CN101079852A (en) * | 2006-05-24 | 2007-11-28 | 株式会社东芝 | Gateway apparatus and renegotiation method |
| WO2008014045A3 (en) * | 2006-07-27 | 2008-07-31 | Motorola Inc | An internet protocol multimedia subsystem network element and method of operation therefor |
| CN101141768A (en) * | 2007-10-12 | 2008-03-12 | 中兴通讯股份有限公司 | Test method and device for simulating voice quality variation aroused by network characteristic |
| CN103259945A (en) * | 2013-05-20 | 2013-08-21 | 苏州洲际传书信息科技有限公司 | Method for achieving speech coding dynamic switching in voip conversation according to network condition |
| CN103414697A (en) * | 2013-07-22 | 2013-11-27 | 中国联合网络通信集团有限公司 | VOIP self-adaptation speech coding method and system and SIP server |
| CN103634303A (en) * | 2013-11-13 | 2014-03-12 | 中国联合网络通信集团有限公司 | Method and system for realizing VoIP (voice over internet protocol) communication |
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