CN104702569B - Realize the communication service equipment that xenogenesis voice resource exchanges - Google Patents
Realize the communication service equipment that xenogenesis voice resource exchanges Download PDFInfo
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- CN104702569B CN104702569B CN201310655094.1A CN201310655094A CN104702569B CN 104702569 B CN104702569 B CN 104702569B CN 201310655094 A CN201310655094 A CN 201310655094A CN 104702569 B CN104702569 B CN 104702569B
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Abstract
The present invention provides a kind of communication service equipment realized xenogenesis voice resource and exchanged.The equipment mainly includes：I/O plates, Digital Trunk Board and meeting bridge plate, I/O plates are attached by junction line and external transmission speech ciphering equipment, receive the voice signal for sending speech ciphering equipment input, voice signal is transferred to the Digital Trunk Board by interconnecting stitch；Digital Trunk Board converts voice signals into the voice data of SIP, passes through and gives the voice data transmission of SIP to meeting bridge plate based on the core bus of SIP；Meeting bridge plate establishes videoconference between sending speech ciphering equipment and receiving speech ciphering equipment, and the voice data transmission for the SIP for being transmitted Digital Trunk Board using videoconference gives reception speech ciphering equipment.The embodiment of the present invention realizes the xenogenesis voice resource format conversion between private network phone, satellite phone, ultrashort wave, ip voice terminal, the intercommunication between different agreement, the voice terminal that different nets are is realized, realizes the unified signaling conversion between xenogenesis voice resource.
Description
Technical field
The present invention relates to voice communication technology field more particularly to a kind of communication services realized xenogenesis voice resource and exchanged
Equipment.
Background technology
The industries such as People's Armed Police, public security, railway, electric power, petroleum and petrochemical industry in China, there are substantial amounts of xenogenesis voice resource terminal,
It, must be by turning between xenogenesis voice resource terminal since the voice communication system that these xenogenesis voice resource terminals use is different
Exchange device docks, so as to reach voice communication between terminal.Such as public communication network, digital cluster system, satellite network and wired network
In pseudo-terminal（Phone）Intercommunication is realized by programme-controlled exchange；VoIP（Voice over Internet Protocol, net
Network phone）Voice call realizes intercommunication by soft switch；Ultrashort wave net and shortwave net pass through IP radio network gateways and IAD respectively
（Integrated Access Device, integrated access equipment）It realizes the conversion to IP systems, then passes through SoftSwitch again
Intercommunication is realized with terminals such as IP phones or is connected by trunk interface with programme-controlled exchange, is realized mutual with other pseudo-terminals
It is logical.
It is above-mentioned existing realize between xenogenesis voice resource terminal the scheme that communicates there are it is following the problem of：Enterprise's access
Terminal type is more, and communication protocol is more, it is necessary to which inter-network system carries out voice communication, and conventional method is of high cost, and equipment is more, and reliability is low,
Energy consumption is big.
The content of the invention
The embodiment provides a kind of communication service equipment realized xenogenesis voice resource and exchanged, to realize difference
Intercommunication between the voice terminal that agreement, different nets are.
The present invention provides following schemes：
A kind of communication service equipment realized xenogenesis voice resource and exchanged, including：I/O plates, Digital Trunk Board and meeting bridge
Plate,
The I/O plates are attached with external transmission speech ciphering equipment for passing through junction line, receive the transmission language
The voice signal of sound equipment input, the Digital Trunk Board is transferred to by the voice signal by interconnecting stitch；
The Digital Trunk Board for the voice signal to be converted to the voice data of starting session protocol SIP, leads to
It crosses the voice data transmission of the SIP based on the core bus of SIP to the meeting bridge plate；
The meeting bridge plate, for establishing videoconference between the transmission speech ciphering equipment and reception speech ciphering equipment,
The voice data transmission for the SIP for being transmitted the Digital Trunk Board using the videoconference is to the reception voice
Equipment.
The equipment further includes：
Voice Navigation plate, for being needed on the core bus based on SIP if providing various types of voice value-added service
Road code stream carries out Voice Navigation processing.
The equipment further includes：
CPU board, for passing through Peripheral Component Interconnect standard PCI bus to the Digital Trunk Board, meeting bridge plate and language
Sound navigation panel sends control command, and the Digital Trunk Board, meeting bridge plate and Voice Navigation plate are controlled by the control command
It is configured and control process.
The core bus based on SIP includes：H.110 bus.
The Digital Trunk Board includes：E1 TIM trunk interface modules, CT bus interface modules,
The E1 TIM trunk interface modules including a pair of of E1 receiving interfaces and E1 transmission interfaces, are connect by E1 receiving interfaces
The voice signal is received, signaling flow and speech channel code stream are extracted from the voice signal, physical layer is carried out to the signaling flow
After data link layer deals, the CT bus interface modules are transferred to by local data bus, the speech channel code stream is led to
ST bus transfers are crossed to the CT bus interface modules；The synchronous of the voice signal is sent to the CT bus interface modules to join
Examine source signal；
The CT bus interface modules, when the speech channel code stream for being transmitted to the E1 TIM trunk interface modules carries out
Gap exchanges, and is utilized the speech channel code stream after the signaling flow and time gas exchange by E1 transmission interfaces based on the core bus of SIP
It is transferred to the meeting bridge plate；The synchronous reference source signal transmitted according to the E1 TIM trunk interface modules generates local synchronization
The synchronizing clock signals are transferred to described by clock signal and the required synchronizing clock signals that communicate with the core bus
E1 TIM trunk interface modules.
The Digital Trunk Board further includes：
Pci interface module, for receiving the control command that the CPU board is sent by pci bus, by the control command
Local ST bus line commands are converted into, the local ST bus line commands are transferred to the E1 TIM trunk interface modules and/or the CT
Bus interface module.
The Digital Trunk Board further includes：
Hot plug module for providing hot plug and overcurrent protection function for the Digital Trunk Board, and is the number
Relay plate provides power supply and reset signal.
The Digital Trunk Board further includes：
Programmable logic device, for carrying out the sequential coupling of control signal between each module in the Digital Trunk Board
With logical transition processing.
The Digital Trunk Board includes 8 E1 TIM trunk interface modules.
The meeting bridge plate establishes the transmission speech ciphering equipment of videoconference and the total maximum of reception speech ciphering equipment is
240。
The embodiment of the present invention is by using in number it can be seen from the technical solution provided by embodiments of the invention described above
Various types of voice signals after plate are uniformly converted to the voice data of SIP, meeting bridge plate is recycled to pass through videoconference
The voice data of SIP is distributed to reception speech ciphering equipment by mode.Realize private network phone, satellite phone, ultrashort wave, shortwave, number
Xenogenesis voice resource format conversion between word cluster, ip voice terminal realizes different agreement, the voice terminal of different net systems
Between intercommunication, realize the unified signaling conversion between xenogenesis voice resource, realize through an integrated communication service
Equipment completes United Dispatching, distribution and the storage of audio resource, has saved cost.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for this
For the those of ordinary skill of field, without having to pay creative labor, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is that a kind of structure of communication service equipment realized xenogenesis voice resource and exchanged provided in an embodiment of the present invention is shown
It is intended to, in figure, I/O plates 10, Digital Trunk Board 20, Voice Navigation plate 30 and meeting bridge plate 40；
Fig. 2 is a kind of structure diagram of Digital Trunk Board provided in an embodiment of the present invention；
Fig. 3 is 75 ohm of non-equilibrium E1 interface diagrams on a kind of DB37 connectors provided in an embodiment of the present invention.
Specific embodiment
For ease of the understanding to the embodiment of the present invention, done further by taking several specific embodiments as an example below in conjunction with attached drawing
Explanation, and each embodiment does not form the restriction to the embodiment of the present invention.
The purpose of the embodiment of the present invention is to provide a kind of communication service equipment that can be realized xenogenesis voice resource and exchange, each
Kind voice terminal is all linked into equipment, and realizes United Dispatching, distribution and the storage of voice resource.
A kind of structure diagram of communication service equipment realized xenogenesis voice resource and exchanged provided in an embodiment of the present invention
As shown in Figure 1, including：I/O plates 10, Digital Trunk Board 20, Voice Navigation plate 30 and meeting bridge plate 40.
The I/O plates 10 are attached with external transmission speech ciphering equipment for passing through junction line, pass through front and rear interconnection
Stitch is connected with Digital Trunk Board, realizes the connection of communication service equipment and external voice equipment, is received the transmission voice and is set
The voice signal is transferred to Digital Trunk Board by the voice signal of standby input by front and rear interconnection stitch.Above-mentioned transmission voice
Equipment can be PSTN（Public Switched Telephone Network, Public Switched Telephone Network）Equipment or PBX
（Private Branch Exchange, user class interchanger）Equipment.
The Digital Trunk Board 20, for the voice signal to be converted to SIP（Session Initiated
Protocol originates session protocol）Voice data, by based on the core bus of SIP by the voice data transmission of the SIP
To the meeting bridge plate.The above-mentioned core bus based on SIP includes：H.110 bus.
The meeting bridge plate 40, for establishing phone meeting between the transmission speech ciphering equipment and reception speech ciphering equipment
View, the voice data transmission for the SIP for being transmitted the Digital Trunk Board using the videoconference is to the reception
Speech ciphering equipment.
Called phone meeting is exactly generally by the use of telephone set as instrument, utilizes telephone line（Including each operator
Fixed-line telephone network and mobile telephone network）The new conference model having a meeting as carrier.Compared with traditional meeting, there is meeting
View arrange it is rapid, without time, territory restriction, it is low-cost the features such as.Compared with the point-to-point telephone service of tradition, from function
On say, the boundary of 2 sides can only be confined to by breaking call, can meet call needs more than 3 sides.Therefore, above-mentioned transmission voice
Equipment and the quantity for receiving speech ciphering equipment can be multiple, and meeting bridge plate can pass through videoconference, and will to send speech ciphering equipment defeated
The voice signal simultaneous transmission gone out gives multiple reception speech ciphering equipments.
Voice Navigation plate 30, for needing to provide various types of voice value-added service on the core bus based on SIP
Speech channel code stream carries out Voice Navigation processing, above-mentioned various types of voice value-added service can be voice transmitting-receiving, dual-audio collect the digits, FSK
（Frequency-shift Keying：Frequency shift keying）The various types of voice value-added services such as hair number.
CPU board 50, for passing through PCI（Peripheral Component Interconnect, Peripheral Component Interconnect mark
It is accurate）Bus sends control command to the Digital Trunk Board, meeting bridge plate and Voice Navigation plate, passes through the control command control
It makes the Digital Trunk Board, meeting bridge plate and Voice Navigation plate is configured and control process, for example, controlling the digital junction
Mutual co-ordination between plate, meeting bridge plate and Voice Navigation plate.
An embodiment of the present invention provides a kind of structure diagram of Digital Trunk Board as shown in Fig. 2, including：E1 trunk interfaces
Module, CT（Computer Telephony, compuphone）Bus interface module, pci interface module, hot plug module and can
Programmed logic device etc..
The E1 TIM trunk interface modules including a pair of of E1 receiving interfaces and E1 transmission interfaces, exchange for voice channel time slot.
The voice signal is received by E1 receiving interfaces, signaling flow and speech channel code stream are extracted from the voice signal, by described in
Signaling flow is transferred to local data bus after physical layer and link layer process, then is transferred to by local data bus described
The speech channel code stream is passed through ST by CT bus interface modules（Serial Telecom, serial communication）Bus transfer gives the CT
Bus interface module.The synchronous reference source signal of the voice signal is sent to the CT bus interface modules, and it is total to receive CT
The synchronizing clock signals that Line Interface Module provides.Above-mentioned CT buses belong to H.110 bus standard, are a kind of new voice bus marks
It is accurate.
The CT bus interface modules, when the speech channel code stream for being transmitted to the E1 TIM trunk interface modules carries out
Gap exchanges, and is utilized the speech channel code stream after the signaling flow and time gas exchange by E1 transmission interfaces based on the core bus of SIP
It is transferred to the meeting bridge plate；The synchronous reference source signal transmitted according to the E1 TIM trunk interface modules generates local synchronization
The synchronizing clock signals are sent to E1 relayings and connect by clock signal and the required synchronizing clock signals that communicate with the core bus
Mouth mold block.
Pci interface module, for receiving the control command that the CPU board is sent by pci bus, by the control command
Local ST bus line commands are converted into, the local ST bus line commands are transferred to the E1 TIM trunk interface modules and/or the CT
Bus interface module carries out every configuration and control etc. for E1 TIM trunk interface modules and/or CT bus interface modules.PCI simultaneously
Interface module also carries out necessary signaling receiving and transmission processing to the signaling code stream on local bus, coordinates with hot plug module and realizes heat
Plug function.
Hot plug module for providing hot plug and overcurrent protection function for the Digital Trunk Board, and is the number
Relay plate provides power supply and reset signal.
Programmable logic device, for carrying out the sequential coupling of control signal between each module in the Digital Trunk Board
With logical transition processing.
The Digital Trunk Board can include 8 E1 TIM trunk interface modules, and E1 interfaces use DB37 connectors, E1 interfaces
DB37 used provides 8 road E1 interfaces.75 ohm of non-equilibrium E1 interfaces on a kind of DB37 connectors that the embodiment provides show
It is intended to as shown in figure 3, line sequence is defined as follows：
| Sequence number | Pin function describes | Sequence number | Pin function describes |
| 21 | The reception of first via E1 passages+ | 23 | The reception of second road E1 passages+ |
| 3 | The reception of first via E1 passages- | 5 | The reception of second road E1 passages- |
| 22 | The transmission of first via E1 passages- | 24 | The transmission of second road E1 passages- |
| 4 | The transmission of first via E1 passages+ | 6 | The transmission of second road E1 passages+ |
| 25 | The reception of 3rd road E1 passages+ | 27 | The reception of 4th road E1 passages+ |
| 7 | The reception of 3rd road E1 passages- | 9 | The reception of 4th road E1 passages- |
| 26 | The transmission of 3rd road E1 passages- | 28 | The transmission of 4th road E1 passages- |
| 8 | The transmission of 3rd road E1 passages+ | 10 | The transmission of 4th road E1 passages+ |
| 29 | The reception of 5th road E1 passages+ | 31 | The reception of 6th road E1 passages+ |
| 11 | The reception of 5th road E1 passages- | 13 | The reception of 6th road E1 passages- |
| 30 | The transmission of 5th road E1 passages- | 32 | The transmission of 6th road E1 passages- |
| 12 | The transmission of 5th road E1 passages+ | 14 | The transmission of 6th road E1 passages+ |
| 33 | The reception of 7th road E1 passages+ | 35 | The reception of 8th road E1 passages+ |
| 15 | The reception of 7th road E1 passages- | 17 | The reception of 8th road E1 passages- |
| 34 | The transmission of 7th road E1 passages- | 36 | The transmission of 8th road E1 passages- |
| 16 | The transmission of 7th road E1 passages+ | 18 | The transmission of 8th road E1 passages+ |
The meeting bridge plate establishes the transmission speech ciphering equipment of videoconference and the total maximum of reception speech ciphering equipment is
240.Trunk information is mainly converted into H.110 bus core bus form by above-mentioned Digital Trunk Board under the control of CPU board, is
Each resource board carries out function services and provides information to source.The method that the design of Digital Trunk Board mainly uses modularized design, just
In the update upgrading designed later, 8 E1 accesses, 240 road SIP accesses meet 240 side's requested sessions.
The communication service equipment that above-mentioned realization xenogenesis voice resource exchanges mainly completes the transcoding of audio medium stream, multichannel is mixed
The functions such as sound, recording, playback, echo cancellation.It possesses code stream forwarding capability, can front audio circulate be dealt into dispatching desk,
Storage device；Possessing powerful Streaming Media processing capacity, separate unit 1440 road voice non-blocking schedulings of support are concurrent, forward process,
480 side's audio mixings are supported in single game meeting.
In conclusion the embodiment of the present invention is uniformly converted to various types of voice signals by using Digital Trunk Board
The voice data of SIP recycles meeting bridge plate that the voice data of SIP is distributed to reception voice by way of videoconference and sets
It is standby.Realize the xenogenesis voice resource between private network phone, satellite phone, ultrashort wave, shortwave, Digital Clustering, ip voice terminal
Format conversion, realize different agreement, different net system voice terminal between intercommunication, realize between xenogenesis voice resource
Unified signaling conversion, so as to fulfill the voice intercommunication between xenogenesis voice resource terminal device.It realizes integrated by one
Communication service equipment completes United Dispatching, distribution and the storage of audio resource, has saved cost, has improved reliability, has reduced
Energy consumption.
The characteristics of between combination of embodiment of the present invention programme-controlled exchange and SoftSwitch, for black phone exchange network
Various voice terminals, the voice terminal of flexible exchanging network and the voice terminal of ultrashort wave net, shortwave net and satellite network etc. are set
Complex communication problem between standby xenogenesis voice resource, it is proposed that brand-new solution method preferably solves xenogenesis voice money
The distribution in source, intercommunication problem.
The embodiment of the present invention can be solved at present in industries such as public security, People's Armed Police and in energy industries such as electric power, petrochemical industry
In large enterprise, the fusion problem of audio and video resources solves net system independently of each other, and the degree of automation is low, information mutual communication between net system
Largely by human relay working, the problems such as step is more, speed is slow, solution original system operation interface is excessive, using it is scattered the problems such as,
Realize United Dispatching interface.The interconnection mode of equipment is changed, being changed into IP by Hard link is flexible coupling, and is changed by hard terminal soft
Terminal is automatically controlled by docking to be changed into manually, supports plug and play, quickly networking, can be from terminal, network, business, management
Four levels really realize the shared of audio and video resources, United Dispatching and management.
One of ordinary skill in the art will appreciate that：Attached drawing is the schematic diagram of one embodiment, module in attached drawing or
Flow is not necessarily implemented necessary to the present invention.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can
It is realized by the mode of software plus required general hardware platform.Based on such understanding, technical scheme essence
On the part that the prior art contributes can be embodied in the form of software product in other words, the computer software product
It can be stored in storage medium, such as ROM/RAM, magnetic disc, CD, it is used including some instructions so that a computer equipment
（Can be personal computer, server or the network equipment etc.）Perform some of each embodiment or embodiment of the invention
Method described in part.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Point just to refer each other, and the highlights of each of the examples are difference from other examples.Especially for device or
For system embodiment, since it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to method
The part explanation of embodiment.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit that separating component illustrates may or may not be it is physically separate, the component shown as unit can be or
Person may not be physical location, you can be located at a place or can also be distributed in multiple network element.It can root
Factually border needs to select some or all of module therein realize the purpose of this embodiment scheme.Ordinary skill
Personnel are without creative efforts, you can to understand and implement.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (10)
1. a kind of communication service equipment realized xenogenesis voice resource and exchanged, which is characterized in that including：I/O plates, digital junction
Plate, meeting bridge plate and CPU board,
The I/O plates are attached for passing through junction line with external transmission speech ciphering equipment, receive the transmission voice and set
The voice signal of standby input, the Digital Trunk Board is transferred to by the voice signal by interconnecting stitch；
The Digital Trunk Board for the voice signal to be converted to the voice data of starting session protocol SIP, passes through base
The voice data transmission of the SIP is given to the meeting bridge plate in the core bus of SIP；Wherein, the Digital Trunk Board bag
It includes：E1 TIM trunk interface modules and CT bus interface modules, the E1 TIM trunk interface modules and CT bus interface modules, for reality
The time gas exchange of existing voice data, the voice data include：Signaling flow and speech channel code stream；
The meeting bridge plate for establishing videoconference between the transmission speech ciphering equipment and reception speech ciphering equipment, utilizes
The voice data transmission for the SIP that the videoconference transmits the Digital Trunk Board is set to the reception voice
It is standby；
The CPU board sends for passing through Peripheral Component Interconnect standard PCI bus to the Digital Trunk Board and meeting bridge plate
Control command controls the Digital Trunk Board by the control command and meeting bridge plate is configured and control process.
2. the communication service equipment according to claim 1 realized xenogenesis voice resource and exchanged, which is characterized in that described
Equipment further includes：
Voice Navigation plate, for the speech channel code to needing offer various types of voice value-added service on the core bus based on SIP
Stream carries out Voice Navigation processing.
3. the communication service equipment according to claim 2 realized xenogenesis voice resource and exchanged, which is characterized in that described
Equipment further includes：
CPU board sends control command to the Voice Navigation plate for passing through Peripheral Component Interconnect standard PCI bus, passes through institute
Stating control command controls the Voice Navigation plate to be configured and control process.
4. the communication service equipment according to claim 1 realized xenogenesis voice resource and exchanged, which is characterized in that described
Core bus based on SIP includes：H.110 bus.
5. the communication service equipment according to claim 1 realized xenogenesis voice resource and exchanged, which is characterized in that
Including a pair of of E1 receiving interfaces and E1 transmission interfaces, institute is received by E1 receiving interfaces for the E1 TIM trunk interface modules
Predicate sound signal extracts signaling flow and speech channel code stream from the voice signal, and physical layer sum number is carried out to the signaling flow
After link layer process, the CT bus interface modules are transferred to by local data bus, the speech channel code stream is passed through into ST
Bus transfer gives the CT bus interface modules；The synchronous reference source of the voice signal is sent to the CT bus interface modules
Signal；
The CT bus interface modules, the speech channel code stream for being transmitted to the E1 TIM trunk interface modules carry out time slot friendship
It changes, is utilized the speech channel bit stream after the signaling flow and time gas exchange by E1 transmission interfaces based on the core bus of SIP
To the meeting bridge plate；The synchronous reference source signal transmitted according to the E1 TIM trunk interface modules generates local synchronous clock
Signal and the required synchronizing clock signals that communicate with the core bus, the synchronizing clock signals are transferred in the E1
After interface module.
6. the communication service equipment according to claim 5 realized xenogenesis voice resource and exchanged, which is characterized in that described
Digital Trunk Board further includes：
For receiving the control command that the CPU board is sent by pci bus, the control command is converted for pci interface module
Into local ST bus line commands, the local ST bus line commands are transferred to the E1 TIM trunk interface modules and/or the CT buses
Interface module.
7. the communication service equipment according to claim 6 realized xenogenesis voice resource and exchanged, which is characterized in that described
Digital Trunk Board further includes：
Hot plug module for providing hot plug and overcurrent protection function for the Digital Trunk Board, and is the digital junction
Plate provides power supply and reset signal.
8. the communication service equipment according to claim 7 realized xenogenesis voice resource and exchanged, which is characterized in that described
Digital Trunk Board further includes：
Programmable logic device, for carrying out the sequential coupling of control signal between each module in the Digital Trunk Board and patrolling
Collect conversion process.
9. the communication service equipment according to claim 5 realized xenogenesis voice resource and exchanged, which is characterized in that described
Digital Trunk Board includes 8 E1 TIM trunk interface modules.
10. the communication service equipment according to claim 9 realized xenogenesis voice resource and exchanged, which is characterized in that described
Meeting bridge plate establish videoconference send speech ciphering equipment and receive speech ciphering equipment total maximum be 240.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1669258A (en) * | 2002-06-17 | 2005-09-14 | 吉尼塞斯电信实验室公司 | Call transfer using session initiation protocol (sip) |
| CN2785280Y (en) * | 2005-02-28 | 2006-05-31 | 周彧 | Telephone virtual network integrated service platform |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7532713B2 (en) * | 2004-09-23 | 2009-05-12 | Vapps Llc | System and method for voice over internet protocol audio conferencing |
| US9020119B2 (en) * | 2011-10-31 | 2015-04-28 | Blackberry Limited | Moderation control method for participants in a heterogeneous conference call |
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2013
- 2013-12-05 CN CN201310655094.1A patent/CN104702569B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1669258A (en) * | 2002-06-17 | 2005-09-14 | 吉尼塞斯电信实验室公司 | Call transfer using session initiation protocol (sip) |
| CN2785280Y (en) * | 2005-02-28 | 2006-05-31 | 周彧 | Telephone virtual network integrated service platform |
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