WO2010102498A1 - 一种支持voip、cs电话的系统和方法 - Google Patents
一种支持voip、cs电话的系统和方法 Download PDFInfo
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- WO2010102498A1 WO2010102498A1 PCT/CN2009/075772 CN2009075772W WO2010102498A1 WO 2010102498 A1 WO2010102498 A1 WO 2010102498A1 CN 2009075772 W CN2009075772 W CN 2009075772W WO 2010102498 A1 WO2010102498 A1 WO 2010102498A1
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- module
- voip
- wireless broadband
- call
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/0024—Services and arrangements where telephone services are combined with data services
- H04M7/0057—Services where the data services network provides a telephone service in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1059—End-user terminal functionalities specially adapted for real-time communication
Definitions
- the present invention relates to the field of communications and electronics, and more particularly to a system and method for supporting voice over layer (VOIP) and circuit switched (CS) phones based on network layer protocols.
- VOIP voice over layer
- CS circuit switched
- VOIP Voice over Internet Protocol
- VoIP analog voice signal
- VoIP Voice over Internet Protocol
- the basic principle of VOIP is to compress and package the voice data encoding through the voice compression algorithm, so that the voice data can be transmitted to the destination end on the IP network, and then the data packet is restored to the original voice signal for answering by the opposite procedure.
- VOIP has been in existence for more than 10 years since its introduction. With the continuous advancement of technology, VOIP has made great progress in voice quality and quality of service (QoS). At the same time, it has the advantages of convenient deployment and low cost. It has been widely used around the world.
- PSTN Public Switched Telephone Network
- third-generation digital communication (3G) and super-third generation mobile communication systems (B3G) have become closer and closer to our lives.
- Mobile operators in various countries are actively deploying broadband communication networks suitable for their own countries to attract more users through rich service types.
- the combination of VOIP phones and traditional CS phones is one of the types of services.
- the gateway device of the home or small and medium-sized enterprise integrates the gateway routing device including the local area network (LAN), the wireless local area network (WLAN), and the wide area network (WAN), and can provide the internal networking function to the user, and can fully utilize the wireless broadband bandwidth to realize the Internet service. deploy.
- an independent VOIP phone or CS phone function can be implemented through a single device or a gateway, but the device utilization rate is not high, and it is difficult to greatly increase its value-added capability.
- SLIC subscriber line interface circuit
- the functions of the VOIP packet telephone and the CS telephone of the home and the enterprise can be implemented on the same device or gateway, the functions of the two-way SLIC are fixed, that is, only the voice streams or CS phones flowing through the respective VOIP telephones can be separately processed.
- the voice code stream leads to a complicated workflow of the entire system, and the overall communication cost is also high.
- the main object of the present invention is to provide a support under a wireless broadband network.
- VOIP, CS phone system and method can enjoy the voice function of VOIP and CS phone on the same phone, which increases the value-added ability and reduces the communication cost.
- the present invention provides a system for supporting a voice VOIP and a circuit switched CS telephone based on a network layer protocol, including: a terminal gateway device, a wireless broadband module, and a subscriber line interface circuit SLIC;
- the wireless broadband module is configured to perform network registration of a VOIP phone, a WAN connection, and a CS phone, and complete transmission of a voice code stream between the terminal gateway device and the wireless broadband network; the terminal gateway device is configured to receive The signal determines whether the VOIP call or the CS call is currently initiated. If it is a VOIP call, the session initialization protocol SIP connection is established through the wireless broadband module, and the pulse code modulated PCM line signal is converted into a VOIP voice code stream, and sent to the wireless through the wireless broadband module.
- the broadband network converts the VOIP voice stream from the wireless broadband module into a PCM line signal.
- the wireless broadband module converts the PCM line signal into a CS voice stream, and transmits it to the wireless through the wireless broadband module.
- Broadband network The network converts the CS voice stream from the wireless broadband module into a PCM line signal; the SLIC is used for bidirectional transmission of the serial peripheral interface SPI signal between the phone and the terminal gateway device, and is used for the phone and the terminal gateway device. Bidirectional transfer of signals between the PCM lines.
- the terminal gateway device includes: a SLIC driving module, and voice digital signal processing.
- DSP module real-time transport protocol RTP/ RTP control protocol RTCP module, SIP module and voice application module;
- the SLIC driving module is configured to detect an SPI signal from the SLIC, determine whether a VOIP call or a CS call is currently initiated, and encode the PCM line signal into a VOIP voice code stream or a CS voice code stream corresponding to the call type. Transmitting the encoded voice code stream to the voice DSP module, and decoding the VOIP voice code stream or the CS voice code stream from the voice DSP module into a PCM line signal;
- the voice DSP module is configured to compress and encapsulate the encoded voice code stream to obtain a voice data packet, send the voice data packet to the RTP/RTCP module when performing the VOIP call, and send the voice data packet to the voice application when performing the CS call. Module, and unpacking and decompressing the voice data packet from the voice application module or the RTP/RTCP module to obtain a VOIP voice code stream or a CS voice code stream;
- the RTP/RTCP module is used for real-time transmission control of voice data packets of a VOIP call on an IP network, mainly for transmitting a voice data packet from a voice DSP module to a wireless broadband module through a voice application module, and then by wireless broadband The module sends to the IP network, and sends the voice data packet received by the voice application module to the voice DSP module;
- the SIP module is configured to complete creation, modification, and release of a VOIP session
- the voice application module is configured to identify a voice code stream from the wireless broadband module, determine whether a VOIP call or a CS call is currently performed, and establish a terminal gateway device and a wireless broadband module through a point-to-point protocol PPP during a VOIP call. Connected, and will receive voice data The packet is sent to the RTP/RTCP module, and the received voice stream is sent to the voice DSP module during the CS call.
- the terminal gateway device further includes a web user management interface module, configured to register and authenticate the SIP server and the port.
- the present invention also provides a system for supporting VOIP and CS phones, including: a terminal gateway device, a wireless broadband module, a SLIC, and a switch SWITCH;
- the wireless broadband module is used for network registration of a VOIP phone, establishment of a WAN connection, and CS phone, and completes transmission of a voice code stream between the terminal gateway device and the wireless broadband network; and is also used for CS voice code stream passing through the SLIC to the wireless
- the CS connection is established when the PCM line is transmitted between the broadband modules, and the PCM line signal is converted into the CS voice code stream and sent to the wireless broadband network, and the CS voice code stream from the wireless broadband network is converted into the PCM line signal;
- the terminal gateway device is configured to determine, according to the received signal, whether a VOIP call or a CS call is currently initiated, and if it is a VOIP call, establish a SIP connection through the wireless broadband module, convert the PCM line signal into a VOIP voice code stream, and pass the wireless
- the broadband module transmits to the wireless broadband network, or converts the VOIP voice stream from the wireless broadband module into a PCM line signal; if it is a CS call, establishes a CS connection through the wireless broadband module, converts the PCM line signal into a CS voice stream, and passes
- the wireless broadband module transmits to the wireless broadband network, and converts the CS voice code stream from the wireless broadband module into a PCM line signal;
- the SLIC is used for bidirectional transmission of SPI signals between the phone and the terminal gateway device, and is used for bidirectional transmission of PCM line signals between the phone and the SWITCH;
- the SWITCH is used for transmitting a VOIP voice stream between the terminal gateway device and the SLIC, and is also used for establishing a PCM line of the SLIC to the terminal gateway device or the wireless broadband module, Transmit CS voice code stream.
- the terminal gateway device includes: a SLIC driver module, a voice DSP module, an RTP/RTCP module, a SIP module, a voice application module, and a web user management interface module;
- the SLIC driving module is configured to detect an SPI signal from the SLIC, determine whether a VOIP call or a CS call is currently initiated, and encode the PCM line signal into a VOIP voice code stream or a CS voice code stream corresponding to the call type. Transmitting the encoded voice code stream to the voice DSP module, and decoding the VOIP voice code stream or the CS voice code stream from the voice DSP module into a PCM line signal;
- the voice DSP module is configured to compress and encapsulate the encoded voice code stream to obtain a voice data packet, send the voice data packet to the RTP/RTCP module when performing the VOIP call, and send the voice data packet to the voice application when performing the CS call. Module, and unpacking and decompressing the voice data packet from the voice application module or the RTP/RTCP module to obtain a VOIP voice code stream or a CS voice code stream;
- the RTP/RTCP module is used for real-time transmission control of voice data packets of a VOIP call on an IP network, mainly for transmitting a voice data packet from a voice DSP module to a wireless broadband module through a voice application module, and then by wireless broadband The module sends to the IP network, and sends the voice data packet received by the voice application module to the voice DSP module;
- the SIP module is configured to complete creation, modification, and release of a VOIP session
- the voice application module is configured to identify a voice code stream from the wireless broadband module, determine whether a current VOIP call or a CS call is performed, and establish a connection between the terminal gateway device and the wireless broadband module through the PPP during the VOIP call. And send the received voice packets to
- the RTP/RTCP module sends the received voice code stream to the voice DSP module during the CS call; the web user management interface module is configured to control the SWITCH to establish the SLIC when the SLIC driver module determines that the CS call is currently initiated.
- PCM line or SLIC of the terminal gateway device The PCM line to the wireless broadband module is used to transmit the CS voice stream.
- the web user management interface module is further configured to register and authenticate the SIP server and the port.
- the wireless broadband module is a time division: a synchronous code division multiple access technology TD-SC DMA, or a wideband code division multiple access WCDMA, or a code division multiple access CDMA2000, and a long-term evolution LTE under the third generation mobile communication system B3G.
- the global microwave interconnection access communication module of different protocols such as WIMAX standard, or compatible with packet domain IP-based general packet radio service GPRS, or enhanced data rate global mobile communication system evolution technology EDGE and various evolved radio access methods.
- the invention also provides a method for supporting VOIP and CS calls, including two processes of calling and called, and the implementation steps are as follows:
- the user picks up the phone, and the off-hook signal is sent to the terminal gateway device via the SPI.
- the terminal gateway device gives the off-hook tone and sends it to the phone through the SLIC, which is played by the phone to the user.
- the user dials the VOIP and CS numbers in different dialing modes through the phone, and the terminal gateway device identifies the dialing signaling.
- the user establishes a VOIP and CS call connection with the called party, and the respective PCM line signals are converted into corresponding voice code streams and transmitted to the called party.
- the called party's voice code stream is converted into a PCM line signal and transmitted to the calling party.
- the terminal gateway device When the user hangs up, the terminal gateway device will detect the hang up button and release the call connection; the user is called:
- the terminal gateway device receives the call request from the calling party, and determines whether the received call request is a VOIP request or a CS request;
- the user establishes a VOIP and CS session connection with the calling party, and the SLIC transmits the ringing information and the phone number to the phone;
- the user picks up the phone, VOIP, CS voice stream is converted into PCM line signal, and then transmitted to the SLIC through the PCM line, and finally transmitted to the user through the phone, the user's PCM line signal is converted into VOIP, CS voice code stream and transmitted to the main Calling party
- the wireless broadband module sends the received disconnect request to the terminal gateway device, and the terminal gateway device releases the session, and the entire call process ends.
- the terminal gateway device sends a dial-up connection request to the called party through the wireless broadband module, and the called party agrees to accept the call establishment success. If the VOIP call is made, the PCM line signal is converted into a VOIP voice data packet by the terminal gateway device and transmitted to the called party. The VOIP voice data packet from the called party is sent by the wireless broadband module to the terminal gateway device, and converted into a PCM line signal and transmitted to the calling user;
- the CS call is made, if the CS voice stream is transmitted through the SLIC to the PCM line of the terminal gateway device, the PCM line signal is converted by the terminal gateway device into a CS voice stream, and transmitted to the called party through the wireless broadband module, from the The CS voice code of the called party is decoded by the terminal gateway device into a PCM line signal and then transmitted to the calling user. If the CS voice code stream is transmitted through the SLIC to the PCM line of the wireless broadband module, the wireless bandwidth module converts the PCM line signal into CS. The voice code stream is transmitted to the called party, and the CS voice stream of the called party is converted into a PCM line signal and transmitted to the calling user.
- the two parties transmit the VOIP and CS voice code streams to each other, and the specifics are as follows:
- the terminal gateway device converts the VOIP voice data packet into a PCM line signal, which is transmitted to the SLIC through the PCM line, and is transmitted to the user by the phone.
- the user's PCM line signal is converted into VOIP voice by the terminal gateway device.
- the data packet is transmitted to the calling party; if the CS call is made, if the CS voice code stream passes through the PCM line of the wireless broadband module For transmission, the CS voice code is transmitted to the terminal gateway device via the wireless broadband module, and is converted into
- the PCM line signal is transmitted to the SLIC and played to the user through the phone, and the terminal gateway device converts the user's PCM line signal into a CS voice code stream and then transmits it to the calling party by the wireless broadband module; if the CS voice code stream passes through the wireless broadband
- the module's own PCM line transmits, and the wireless broadband module converts the CS voice stream into a PCM line signal, and finally plays it to the user through the phone, and transmits the user's PCM line signal to the wireless broadband module, and converts it into a CS voice code.
- the stream is passed to the calling party.
- the present invention adopts a single-channel SLIC combined with a switch (SWITCH) as a hardware foundation and a corresponding software processing flow, which can make the user different according to different The business scenarios and different tariff standards enjoy different voice services on the same phone. Mobile operators can also deploy corresponding services according to specific situations and improve value-added capabilities.
- SWITCH switch
- SWITCH combined with the use of the Web user management interface module enables the CS telephone voice stream to be selected as the pulse code modulation of the terminal gateway device ( The PCM) line also enters the PCM line of the wireless broadband module directly, making the wireless broadband module of the application more selectable in the present invention.
- FIG. 1 is a structural block diagram of a wireless broadband module in the present invention without a voice digital signal processing function
- FIG. 2 is a structural block diagram of a wireless broadband module having a voice digital signal processing function according to the present invention
- FIG. 3 is a structural block diagram of a functional implementation of the present invention. detailed description
- FIG. 1 is a structural block diagram of a wireless broadband module that does not have a voice digital signal processing (DSP) function according to the present invention.
- the method includes: a terminal gateway device, a wireless broadband module, a SLIC, a phone, and the like;
- the phone is configured to receive a user's dialing, perform button reporting, voice signal transmission, and power display;
- the SLIC is used for bidirectional transmission of a serial peripheral interface (SPI) signal between the phone and the terminal gateway device, and is used for bidirectional transmission of the PCM line signal between the phone and the terminal gateway device;
- SPI serial peripheral interface
- the terminal gateway device is configured to determine, according to the received signal, whether a VOIP call or a CS call is currently initiated, and if it is a VOIP call, establish a Session Initiation Protocol (SIP) connection through the wireless broadband module, and convert the PCM line signal into a VOIP voice.
- SIP Session Initiation Protocol
- the code stream is sent to the wireless broadband network through the wireless broadband module, and converts the VOIP voice code stream from the wireless broadband module into a PCM line signal; if it is a CS call, establishes a CS connection through the wireless broadband module, and converts the PCM line signal into CS voice.
- the code stream is sent to the wireless broadband network through the wireless broadband module, and converts the CS voice code stream from the wireless broadband module into a PCM line signal;
- the signal that the terminal gateway device determines whether the VOIP call or the CS call is currently initiated may be the received SPI signal, or may be an AT command or SIP signaling from the wireless broadband module.
- the wireless broadband module is used for network registration of a VOIP phone, WAN connection, and establishment of a CS phone, and completes transmission of a voice code stream between the terminal gateway device and the wireless broadband network.
- FIG. 2 is a structural block diagram of a wireless broadband module having a voice DSP function according to the present invention. As shown in FIG. 2, the method includes: a terminal gateway device, a wireless broadband module, a SWITCH, a SLIC, and a phone, that is, in the structure shown in FIG. Increase SWITCH; where
- the SWITCH is used for transmitting a VOIP voice stream between the terminal gateway device and the SLIC, and is also used for establishing a PCM line of the SLIC to the terminal gateway device or the wireless broadband module, Transmitting CS voice code stream;
- the terminal gateway device is configured to determine, according to the received signal, whether a VOIP call or a CS call is currently initiated, and if it is a VOIP call, establish a SIP connection through the wireless broadband module, convert the PCM line signal into a VOIP voice code stream, and pass the wireless
- the broadband module transmits to the wireless broadband network, or converts the VOIP voice stream from the wireless broadband module into a PCM line signal; if it is a CS call, establishes a CS connection through the wireless broadband module, converts the PCM line signal into a CS voice stream, and passes
- the wireless broadband module transmits to the wireless broadband network, and converts the CS voice code stream from the wireless broadband module into a PCM line signal;
- the wireless bandwidth module is used for network registration of a VOIP phone, establishment of a WAN connection, and CS phone, and completes transmission of a voice code stream between the terminal gateway device and the wireless broadband network; and is also used for CS voice code stream passing through the SLIC to the wireless
- the CS connection is established when the PCM line is transmitted between the broadband modules, and the PCM line signal is converted into the CS voice code stream and sent to the wireless broadband network, and the CS voice code stream from the wireless broadband network is converted into the PCM line signal;
- the SLIC is used for bidirectional transmission of SPI signals between the phone and the terminal gateway device, and is used for bidirectional transmission of PCM line signals between the phone and the SWITCH.
- the wireless broadband module described in FIG. 1 and FIG. 2 may be time division synchronous code division multiple access (T D-SCDMA), wideband code division multiple access (WCDMA), code division multiple access (CDMA) 2000, and B 3G.
- Communication modules of different protocols such as Long Term Evolution (LTE) and Global Interoperability for Microwave Access (WIMAX) can also be compatible with packet-based IP-based general packet radio service (GPRS) and enhanced data rate global mobile communication system evolution technology (EDGE) and various evolved wireless access methods to increase flexibility, enabling the gateway system of the present invention to be used in different regions.
- GPRS packet-based IP-based general packet radio service
- EDGE enhanced data rate global mobile communication system evolution technology
- the modules running on the terminal gateway device are composed of: SLIC driver module, a voice DSP module, a Real Time Transport Protocol (RTP) / RTP Control Protocol (RTCP) module, a SIP module, and a voice application module;
- SLIC driver module a voice DSP module
- RTP Real Time Transport Protocol
- RTCP RTP Control Protocol
- SIP Session Initiation Protocol
- voice application module a voice application module
- the SLIC driving module is configured to detect an SPI signal from the SLIC, determine whether a VOIP call or a CS call is currently initiated, and if it is a VOIP call, encode the PCM line signal into a VOIP voice code stream, if it is a CS call, The PCM line signal is encoded as a CS voice code stream, and the coded voice code stream is sent to the voice DSP module, and the VOIP voice code stream or the CS voice code stream from the voice DSP module is decoded into a PCM line signal;
- the voice DSP module is configured to compress and encapsulate the encoded voice code stream to obtain a voice data packet, send the voice data packet to the RTP/RTCP module when performing the VOIP call, and send the voice data packet to the voice application when performing the CS call. Module, as well as for modules from the voice application or
- the voice data packet of the RTP/RTCP module is unpacked and decompressed to obtain a VOIP voice code stream or a CS voice code stream;
- the RTP/RTCP module the real-time transmission control of the voice data packet for the VOIP call on the IP network, mainly sends the voice data packet from the voice DSP module to the wireless broadband module through the voice application module, and then the wireless broadband The module sends to the IP network, and sends the voice data packet received by the voice application module to the voice DSP module;
- the SIP module is configured to complete creation, modification, and release of a VOIP session
- the voice application module is configured to identify a voice code stream from the wireless broadband module, determine whether a current VOIP call or a CS call is performed, and use a point-to-point protocol (PPP) for the terminal gateway device and the wireless broadband during the VOIP call.
- PPP point-to-point protocol
- the module establishes a connection, and sends the received voice data packet to the RTP/RTCP module, and sends the received voice code stream to the voice during the CS call.
- the terminal gateway device shown in FIG. 2 further includes a web user management interface module, configured to control the SWITCH to establish a SLIC to the terminal gateway device's PCM line or SLIC to the wireless broadband module when the SLIC driver module determines that the CS call is currently initiated.
- PCM line for transmission CS voice stream is included in the terminal gateway device shown in FIG. 2.
- the terminal gateway device platform is based on TD-SCDM.
- the terminal gateway device is based on the device driver, adds the SLIC driver module, and compiles the module into the kernel by default in the compile configuration option, so that the SLIC driver module is loaded into the character device of the operating system after the operating system of the terminal gateway device is started. And cannot be uninstalled while the entire operating system is running.
- the VOIP and CS calls will open, close, and control the use of the SLIC driver module in the form of character devices through the voice DSP module and the voice application module.
- the wireless broadband module is connected to the terminal gateway device through a universal serial bus (USB) or a universal asynchronous transceiver (UART).
- USB universal serial bus
- UART universal asynchronous transceiver
- the wireless broadband module is connected to the terminal gateway device via USB
- the USB will be simultaneously enumerated into at least four devices, which are respectively used for the modulator/demodulator of the VOIP call, the USB-based voice channel of the CS call, and the terminal gateway.
- the VOIP modulator/demodulator and CS's USB-based voice channel cannot be started at the same time.
- the voice DSP module is located on the operating system (OS), network protocol stack, and network address translation (NAT), and the interface with them is the OS adaptation layer.
- the voice DSP module compresses and encapsulates the voice code stream encoded by the SLIC driver module to obtain a voice data packet, and unpacks and decompresses the voice data packet uploaded and transmitted by the wireless broadband network. This is a separate module and uses the underlying SLIC driver module to implement PCM processing of the voice stream.
- the RTP/RTCP module enters the device-driven file system as a media protocol and is mainly responsible for transmitting standard voice data packets over an IP network.
- RTP/RTCP complies with Internet standards.
- RTP/RTCP mode Blocks can be started as processes before the VOIP session is established, rather than being loaded after the operating system is booted, which saves on random access memory and CPU consumption.
- the SIP module is a process of the system, which mainly completes the process of establishing, releasing and controlling a VOIP session.
- the complete SIP system includes four components: a SIP user agent, a SIP registration server, a SIP proxy server, and a SIP redirect server.
- the part involved in the solution of the present invention belongs to a SIP user agent, and the other three servers of the SIP can be used only on the Internet.
- the service can also be established independently.
- the Web user management interface module can be introduced in the terminal gateway device, and the Web user management interface module can adopt the Common Gateway Interface (CGI) or thttpd, Go Ahead.
- CGI Common Gateway Interface
- the voice application module is a system application service module on a terminal gateway device, which plays a different role for VOIP calls and CS calls.
- the voice application module mainly completes the task of creating, releasing, and maintaining the PPP network.
- the voice application module mainly performs the functions of calling, splitting, and maintaining. This process must be loaded after the operating system is started and exists throughout the life of the operating system.
- SWITCH is a circuit switch that can be implemented by the universal user input/output (GPIO) control through the Web user management interface module.
- the main function is to select the PCM line, so that the CS voice stream can be selected to enter the terminal gateway device.
- the PCM line is also directly into the PCM line of the wireless broadband module.
- Step 1 The user picks up the phone, and the off-hook signal is sent to the terminal gateway device via the SPI.
- the terminal gateway is set.
- the SLIC driver module in the standby gives the off-hook tone, and the off-hook tone is sent to the phone through the SLIC, and is played to the user by the phone.
- Step 2 The user dials the VOIP and CS numbers in different dialing modes through the phone, and the terminal gateway device identifies the dialing signaling.
- the called party number of the call in the present invention can be either a VOIP number or a CS number, and the two can be distinguished by different access numbers.
- the called party number of the call in the present invention can be either a VOIP number or a CS number, and the two can be distinguished by different access numbers.
- a CS number when calling a CS number, it can be dialed in the same way as an ordinary call, that is, directly dialing the CS number; when calling a VOIP number, it can be distinguished from the calling CS number by dialing a combination of the VOIP number and the access number. If a special glyph is added before or after the VOIP number to distinguish it.
- Step 3 The user establishes a VOIP and CS call connection with the called party, and the respective PCM line signals are converted into corresponding voice code streams and transmitted to the called party, and the called party's voice code stream is converted into
- the PCM line signal is transmitted to the calling user
- the voice application module in the terminal gateway device establishes a PPP link between the terminal gateway device and the wireless broadband module and notifies the SIP module to establish a SIP connection, and the SIP module will initiate a SIP session to the called party.
- the call request is transmitted by the IP network to the called party.
- the called party agrees to accept the incoming call request, the session is successfully established, and the PCM line signal is transmitted to the terminal gateway device.
- the voice DSP module in the terminal gateway device encodes the SLIC driver module.
- the VOIP voice stream is compressed and packaged, and the VOIP data is transmitted with the called party under the control of the RTP/RTCP module, and the voice of the called party from the voice application module or the RTP/RTCP module is transmitted.
- the data packet is unpacked and decompressed to obtain a VOIP voice code stream, which is then decoded into a PCM line signal and transmitted to the calling user through the telephone.
- the voice application module in the terminal gateway device initiates a dial-up connection request to the wireless broadband module, and the dial-up connection request is transmitted to the called party via the wireless broadband network, and the called party accepts the incoming call request, and the call connection is established. If the wireless broadband module does not have a voice DSP function,
- the PCM line signal is converted into a CS voice code stream by the terminal gateway device, and transmitted to the called party through the wireless broadband module, and the CS voice code stream from the called party is decoded into a PCM line signal by the terminal gateway device and transmitted to the calling user; If the wireless broadband module has a voice DSP function, the terminal gateway device determines whether the SLIC to the terminal gateway device or the SLIC to the wireless broadband module PCM line transmits the CS voice code stream, and controls the SWITCH to establish a PCM line corresponding to the CS voice code stream.
- the CS voice code stream is transmitted through the SLIC to the PCM line of the terminal gateway device, and the PCM line signal is converted by the terminal gateway device into a CS voice code stream, and transmitted to the called party through the wireless broadband module, and the CS voice code stream from the called party is transmitted. After being decoded into a PCM line signal by the terminal gateway device, the signal is transmitted to the calling user. If the CS voice code stream is transmitted through the SLIC to the PCM line of the wireless broadband module, the wireless bandwidth module converts the PCM line signal into a CS voice code stream and transmits the signal to the CS voice stream. The called party converts the CS voice stream of the called party into a PCM line signal and transmits it to the calling party. Households.
- Step 4 When the user hangs up, the terminal gateway device will detect the hang up button and release the call connection. Specifically: once the calling user hangs up, the SLIC driver module in the terminal gateway device will detect the hang up button, and the VOIP phone will be The SIP module completes the session release, and the voice application module completes the unlinking of the PPP link; the CS phone will directly disconnect the circuit by the voice application module.
- Step 1 The terminal gateway device receives the call request from the calling party, and determines whether the received call request is a VOIP request or a CS request;
- the wireless broadband module receives the call request of the calling user, and sends the call request to the terminal gateway device through the USB.
- the voice application module in the terminal gateway device determines the call request, and if the SIP signaling is received, the VOIP request is performed.
- the AT command is received, it is a CS request.
- Step 2 The user establishes a VOIP and CS session connection with the calling party, and the SLIC will ring the message and The phone number is passed to the phone;
- the user receives the VOIP phone request, and the voice application module in the terminal gateway device establishes a PPP link between the terminal gateway device and the wireless broadband module, notifies the SIP module to establish a SIP session with the calling party, and uses the SLIC to set the ringing information. And the phone number is passed to the phone;
- the user receives the CS phone request, receives the call request from the wireless broadband module through the voice application module in the terminal gateway device, and transmits the ringing information and the phone number to the phone by the SLIC.
- Step 3 The user picks up the phone, and the VOIP and CS voice code streams are converted into PCM line signals, which are then transmitted to the SLIC through the PCM line, and finally transmitted to the user through the phone.
- the user's PCM line signal is converted into VOIP and CS voice code streams. Transfer to the calling party;
- the user picks up the phone. If the VOIP call is made, the voice packet transmission control is completed by the RTP/RTCP module in the terminal gateway device, and the voice data packet is unpacked and decompressed by the voice DSP module. It is transmitted to the SLIC through the PCM line, and finally transmitted to the user through the phone, and the user's PCM line signal is encoded, and the encoded VOIP voice code stream is compressed and encapsulated into a voice data packet and transmitted to the calling party by the voice DSP module.
- the voice stream is transmitted by the wireless broadband module to the terminal gateway device, and then converted to a PCM line signal to the SLIC, and passed through the handset or hands-free speaker.
- the terminal gateway device converts the user's PCM line signal into a CS voice stream and then transmits it to the calling party by the wireless broadband module; for the wireless broadband module with voice DSP function, the terminal gateway device determines to transmit the CS voice
- the PCM line of the code stream is transmitted by the PCM line carried by the wireless broadband module, and the wireless broadband module converts the CS voice stream into a PCM line signal, which is transmitted to the SLIC through the SWITCH, and is passed through the handset or the hands-free speaker.
- the PCM line signal of the user transmitted through the SLIC is transmitted to the wireless broadband module through the SWITCH, and converted into the CS voice code stream by the wireless broadband module and transmitted to the calling party.
- Step 4 The user hangs up, the wireless broadband module sends the received de-linking request to the terminal gateway device, and the terminal gateway device releases the session, and the entire calling process ends;
- the wireless broadband module sends the disconnect request received from the called party to the voice application module in the terminal gateway device.
- the voice application module notifies the SIP module to release the session; for CS phones, the voice application module performs circuit removal, whereby the entire call process ends.
- the present invention is equally applicable to various wireless networks supporting packet domain and circuit domain.
- the wireless network may include TD-SCDMA, WCDMA, CDMA2000, WIMAX, LTE, GPRS, EDGE, High Speed Packet Access Network (HSPA) and the like.
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Abstract
本发明公开了一种支持基于网络层协议的语音(VOIP)、电路交换(CS)电话的系统, 包括终端网关设备、 无线宽带模块、 用户线接口电路 (SLIC)、开关 (SWITCH) 和话机; 本发明同时公开了本发明公开了一种支持 VOIP、CS电话的方法,采用该系统和方法可使用户根据不同的业务场景在同一部话机上享受不同的语音业务,移动运营商也可根据具体情况部署相应的服务;提升了增值能力,节约了通信成本。
Description
一种支持 VOIP, CS电话的系统和方法 技术领域
本发明涉及通讯领域及电子领域, 尤其涉及一种支持基于网络层协议 的语音( VOIP )、 电路交换( CS ) 电话的系统和方法。 背景技术
VOIP全称为 Voice over Internet Protocol, 筒言之就是将模拟声音信号 ( Voice )数字化, 并以数据包的方式在 IP网络上做实时传输。 VOIP的基 本原理是通过语音压缩算法对语音数据编码进行压缩、 打包处理, 使语音 数据可以在 IP网络上传输到目的端, 然后数据包再经由相反的程序, 还原 成原来的语音信号以供接听者接收。 VOIP从提出到现在已经有 10多年的 时间, 随着技术的不断进步, 现在的 VOIP在语音质量及服务质量(QoS ) 上已经有了长足进步, 同时由于其具有部署方便、 使用价格低廉的优点, 目前已经在全球各地被广泛应用。
传统的 CS电话是公共电话交换网 (PSTN ) 的一部分, 它采用固定信 道模式, 一旦建立通话连接, 则直到通话结束, 该信道都始终被通话双方 占有。
目前, 随着无线宽带网络技术的日益完善, 第三代数字通信(3G )和 超三代移动通信系统(B3G )已经越来越接近我们的生活。 各国移动运营商 正在积极部署适合本国的宽带通讯网络, 以便通过丰富的业务类型吸引更 多的用户, VOIP电话与传统 CS电话的结合就是其中的一种业务类型。 家 庭或中小企业的网关设备集成了局域网 (LAN )、 无线局域网 (WLAN )、 广域网 (WAN )在内的网关路由设备, 可以向用户提供内部组网功能, 同 时可以充分利用无线宽带带宽实现 Internet业务部署。
现有技术中, 可以通过单个设备或网关实现独立的 VOIP电话或 CS电 话功能, 但设备利用率不高, 很难大幅提高其增值能力。 另外, 也可以利 用宽带带宽及移动运营商的传统 PSTN,在网关上挂载双路用户线接口电路 ( SLIC ) 并接入固定电话机。 这样, 虽然可以在同一个设备或网关上实现 家庭和企业的 VOIP分组电话与 CS电话的功能,但两路 SLIC的功能固定, 即只能分别处理流经各自的 VOIP电话语音码流或 CS电话语音码流, 导致 整个系统工作流程较为繁杂, 整体通信成本也偏高。 其次, 由于缺少相应 的转换装置, 现有设备或网关无法对 CS 电话语音码流的传输方式进行选 择。 发明内容
有鉴于此, 本发明的主要目的在于提供一种无线宽带网络下支持
VOIP, CS 电话的系统和方法, 可实现在同一部电话机上享受 VOIP、 CS 电话的语音功能, 提升了增值能力并降低了通信成本。
为达到上述目的, 本发明的技术方案是这样实现的:
本发明提供了一种支持基于网络层协议的语音 VOIP、 电路交换 CS电 话的系统, 包括: 终端网关设备、 无线宽带模块和用户线接口电路 SLIC; 其中,
所述无线宽带模块, 用于 VOIP电话的网络注册、 WAN连接及 CS电 话的建立, 并完成终端网关设备与无线宽带网络之间语音码流的传输; 所述终端网关设备,用于根据收到的信号判断当前发起的是 VOIP呼叫 还是 CS呼叫, 如果是 VOIP呼叫, 通过无线宽带模块建立会话初始化协议 SIP连接, 将脉码调制 PCM线路信号转换为 VOIP语音码流, 通过无线宽 带模块发送至无线宽带网络或将来自无线宽带模块的 VOIP语音码流转换 为 PCM线路信号, 如果是 CS呼叫, 通过无线宽带模块建立 CS连接, 将 PCM线路信号转换为 CS语音码流, 通过无线宽带模块发送至无线宽带网
络或将来自无线宽带模块的 CS语音码流转换为 PCM线路信号; 所述 SLIC, 用于话机与终端网关设备之间的串行外围设备接口 SPI信 号的双向传递,并用于话机与终端网关设备之间的 PCM线路信号的双向传 递。
其中, 所述终端网关设备中包括: SLIC 驱动模块、 语音数字信号处理
DSP模块、 实时传送协议 RTP/ RTP控制协议 RTCP模块、 SIP模块和语 音应用模块; 其中,
所述 SLIC 驱动模块, 用于对来自 SLIC的 SPI信号进行检测, 判断当 前发起的是 VOIP呼叫还是 CS呼叫, 将 PCM线路信号编码为与呼叫类型 相对应的 VOIP语音码流或 CS语音码流, 将该编码后的语音码流发送至语 音 DSP模块, 并对来自于语音 DSP模块的 VOIP语音码流或 CS语音码流 解码为 PCM线路信号;
所述语音 DSP模块, 用于对编码的语音码流进行压缩、 封装得到语音 数据包, 进行 VOIP呼叫时将语音数据包发送至 RTP/ RTCP模块, 进行 CS 呼叫时将语音数据包发送至语音应用模块, 以及对来自于语音应用模块或 RTP/RTCP模块的语音数据包进行解包、 解压缩得到 VOIP语音码流或 CS 语音码流;
所述 RTP/ RTCP模块,用于 VOIP呼叫的语音数据包在 IP网络上的实 时传输控制, 主要是将来自于语音 DSP模块的语音数据包通过语音应用模 块发送至无线宽带模块, 再由无线宽带模块发送至 IP网络, 将通过语音应 用模块收到的语音数据包发送至语音 DSP模块;
所述 SIP模块, 用于完成 VOIP会话的创建、 修改及释放;
所述语音应用模块, 用于对来自于无线宽带模块的语音码流进行识别, 确定当前进行的是 VOIP呼叫还是 CS呼叫, 并在 VOIP呼叫时通过点对点 协议 PPP为终端网关设备与无线宽带模块建立连接, 并将收到的语音数据
包发送至 RTP/RTCP模块,在 CS呼叫时将收到的语音码流发送至语音 DSP 模块。
其中,所述终端网关设备中还包括 Web用户管理界面模块,用于对 SIP 服务器及端口的注册、 鉴权配置。
本发明还提供了一种支持 VOIP、 CS 电话的系统, 包括: 终端网关设 备、 无线宽带模块、 SLIC和开关 SWITCH; 其中,
所述无线宽带模块, 用于 VOIP电话的网络注册、 WAN连接及 CS电 话的建立, 并完成终端网关设备与无线宽带网络之间语音码流的传输; 还 用于 CS语音码流通过 SLIC到无线宽带模块间的 PCM线路传输时建立 CS 连接, 将 PCM线路信号转换为 CS语音码流发送至无线宽带网络, 将来自 无线宽带网络的 CS语音码流的转换为 PCM线路信号;
所述终端网关设备,用于根据收到的信号判断当前发起的是 VOIP呼叫 还是 CS呼叫,如果是 VOIP呼叫,通过无线宽带模块建立 SIP连接,将 PCM 线路信号转换为 VOIP语音码流, 通过无线宽带模块发送至无线宽带网络, 或将来自无线宽带模块的 VOIP语音码流转换为 PCM线路信号;如果是 CS 呼叫, 通过无线宽带模块建立 CS连接, 将 PCM线路信号转换为 CS语音 码流, 通过无线宽带模块发送至无线宽带网络, 将来自无线宽带模块的 CS 语音码流转换为 PCM线路信号;
还用于确定传输 CS语音码流的是 SLIC到终端网关设备还是 SLIC到 无线宽带模块的 PCM线路,并控制 SWITCH建立对应传输 CS语音码流的 PCM线路;
所述 SLIC, 用于话机与终端网关设备之间的 SPI信号的双向传递, 并 用于话机与 SWITCH之间 PCM线路信号的双向传递;
所述 SWITCH, 用于 VOIP语音码流在终端网关设备与 SLIC之间的传 输, 还用于建立 SLIC到终端网关设备或无线宽带模块的 PCM线路, 用来
传输 CS语音码流。
其中, 所述的终端网关设备中包括: SLIC 驱动模块、 语音 DSP模块、 RTP/ RTCP模块、 SIP模块、 语音应用模块和 Web用户管理界面模块; 其 中,
所述 SLIC 驱动模块, 用于对来自 SLIC的 SPI信号进行检测, 判断当 前发起的是 VOIP呼叫还是 CS呼叫, 将 PCM线路信号编码为与呼叫类型 相对应的 VOIP语音码流或 CS语音码流, 将该编码后的语音码流发送至语 音 DSP模块, 并对来自于语音 DSP模块的 VOIP语音码流或 CS语音码流 解码为 PCM线路信号;
所述语音 DSP模块, 用于对编码的语音码流进行压缩、 封装得到语音 数据包, 进行 VOIP呼叫时将语音数据包发送至 RTP/ RTCP模块, 进行 CS 呼叫时将语音数据包发送至语音应用模块, 以及对来自于语音应用模块或 RTP/RTCP模块的语音数据包进行解包、 解压缩得到 VOIP语音码流或 CS 语音码流;
所述 RTP/ RTCP模块,用于 VOIP呼叫的语音数据包在 IP网络上的实 时传输控制, 主要是将来自于语音 DSP模块的语音数据包通过语音应用模 块发送至无线宽带模块, 再由无线宽带模块发送至 IP网络, 将通过语音应 用模块收到的语音数据包发送至语音 DSP模块;
所述 SIP模块, 用于完成 VOIP会话的创建、 修改及释放;
所述语音应用模块, 用于对来自于无线宽带模块的语音码流进行识别, 确定当前进行的是 VOIP呼叫还是 CS呼叫, 并在 VOIP呼叫时通过 PPP为 终端网关设备与无线宽带模块建立连接, 并将收到的语音数据包发送至
RTP/RTCP模块, 在 CS呼叫时将收到的语音码流发送至语音 DSP模块; 所述 Web用户管理界面模块, 用于在 SLIC驱动模块确定当前发起的 是 CS呼叫时,控制 SWITCH建立 SLIC到终端网关设备的 PCM线路或 SLIC
到无线宽带模块的 PCM线路, 用来传输 CS语音码流。
其中,所述 Web用户管理界面模块还用于对 SIP服务器及端口的注册、 鉴权配置。
上述方案中, 所述无线宽带模块为时分: 同步的码分多址技术 TD-SC DMA, 或宽带码分多址 WCDMA、 或码分多址 CDMA2000以及超三代移 动通信系统 B3G下的长期演进 LTE、 或全球微波互联接入 WIMAX制式等 不同协议的通信模块、 或兼容基于分组域 IP的通用分组无线业务 GPRS、 或增强型数据速率全球移动通讯系统演进技术 EDGE及各种演进无线接入 方式。
本发明还提供了一种支持 VOIP、 CS 电话的方法, 包括主叫和被叫两 个过程, 实现步骤如下:
用户主叫步骤:
用户摘机, 摘机信号经 SPI发送到终端网关设备, 终端网关设备给出 摘机音, 并通过 SLIC发送至话机, 由话机播放给用户;
用户通过话机以不同的拨打方式拨打 VOIP、 CS号码, 由终端网关设 备对拨号信令进行识别;
用户与被叫方建立 VOIP、 CS通话连接, 各自的 PCM线路信号被转换 成相应的语音码流后传输给被叫方,被叫方的语音码流被转换成 PCM线路 信号后传输给主叫用户;
用户挂机, 终端网关设备将检测到挂断键, 并释放通话连接; 用户被叫步骤:
终端网关设备接到主叫方的呼叫请求, 并对收到的呼叫请求进行判断 是 VOIP请求还是 CS请求;
用户与主叫方建立 VOIP、 CS会话连接, SLIC将振铃信息和电话号码 传递给话机;
用户摘机, VOIP, CS语音码流被转换成 PCM线路信号, 再通过 PCM 线路传递给 SLIC, 最终通过话机传递给用户, 用户的 PCM线路信号被转 换成 VOIP、 CS语音码流后传输给主叫方;
用户挂机, 无线宽带模块将接收的拆链请求发送给终端网关设备, 终 端网关设备进行会话释放, 整个呼叫过程结束。
其中, 所述主叫时用户与被叫方建立 VOIP、 CS通话连接, 双方互相 传输语音码流的过程, 具体为:
终端网关设备通过无线宽带模块将拨号连接请求发送到被叫方, 被叫 方同意接受则通话建立成功, 如果是进行 VOIP通话, PCM线路信号被终 端网关设备转换成 VOIP语音数据包传输给被叫方, 来自于被叫方的 VOIP 语音数据包由无线宽带模块发送到终端网关设备,并被转换成 PCM线路信 号后传输给主叫用户;
如果是进行 CS通话,若 CS语音码流通过 SLIC到终端网关设备的 PCM 线路进行传输, PCM线路信号由终端网关设备转换为 CS语音码流, 通过 无线宽带模块传输到被叫方,来自于被叫方的 CS语音码流经终端网关设备 解码为 PCM线路信号后传给主叫用户, 若 CS语音码流通过 SLIC到无线 宽带模块的 PCM线路进行传输,无线带宽模块将 PCM线路信号转换为 CS 语音码流, 并传输到被叫方, 将被叫方的 CS语音码流转换为 PCM线路信 号后传给主叫用户。
其中, 所述被叫时用户摘机, 双方互相传输 VOIP、 CS语音码流的过 程, 方具体为:
用户摘机, 如果是进行 VOIP通话, 终端网关设备将 VOIP语音数据包 转换成 PCM线路信号, 通过 PCM线路传递给 SLIC, 由话机传递给用户, 用户的 PCM 线路信号由终端网关设备转换成 VOIP语音数据包传给主叫 方; 如果是进行 CS通话, 若 CS语音码流通过无线宽带模块的 PCM线路
进行传输, CS 语音码流经无线宽带模块传输到终端网关设备, 被转换为
PCM线路信号传递给 SLIC, 并通过话机播放给用户, 并由终端网关设备把 用户的 PCM线路信号转换成 CS语音码流后由无线宽带模块传给主叫方; 若 CS语音码流通过无线宽带模块自带的 PCM线路进行传输, 无线宽带模 块将 CS语音码流转换成 PCM线路信号, 最终通过话机播放给用户, 并把 用户的 PCM线路信号经过传递给无线宽带模块, 并转换成 CS语音码流后 传给主叫方。
因此, 本发明所提供的支持 VOIP、 CS 电话的系统和方法所具备的优 点如下: 本发明采用单路 SLIC并结合开关(SWITCH )作为硬件基础并结 合相应的软件处理流程, 可以使用户根据不同的业务场景、 不同的资费标 准在同一部话机上享受不同的语音业务, 移动运营商也可以根据具体情况 部署相应的服务, 提升了增值能力。 同时, 由于运用了单路 SLIC, 相对于 双路 SLIC来说节约了整体通信成本; SWITCH结合 Web用户管理界面模 块的运用, 使得 CS 电话语音码流可选择是进入终端网关设备的脉码调制 ( PCM )线路还是直接进入无线宽带模块的 PCM线路, 使应用在本发明中 无线宽带模块的可选择范围更广。 附图说明
图 1 为本发明中无线宽带模块不具有语音数字信号处理功能时的结构 框图;
图 2为本发明中无线宽带模块具有语音数字信号处理功能时的结构框 图;
图 3为本发明功能实现的结构框图。 具体实施方式
下面结合附图及具体实施例对本发明进行详细描述。
图 1为本发明中无线宽带模块不具有语音数字信号处理(DSP )功能时 的结构框图, 如图 1所示, 包括: 终端网关设备、 无线宽带模块、 SLIC和 话机等; 其中,
所述话机, 用于接收用户的拨号, 进行按键上报、 语音信号传输、 来 电显示等;
所述 SLIC, 用于话机与终端网关设备之间的串行外围设备接口 (SPI ) 信号的双向传递,并用于话机与终端网关设备之间的 PCM线路信号的双向 传递;
所述终端网关设备,用于根据收到的信号判断当前发起的是 VOIP呼叫 还是 CS呼叫, 如果是 VOIP呼叫, 通过无线宽带模块建立会话初始化协议 (SIP)连接,将 PCM线路信号转换为 VOIP语音码流,通过无线宽带模块发 送至无线宽带网络, 将来自无线宽带模块的 VOIP语音码流转换为 PCM线 路信号; 如果是 CS呼叫, 通过无线宽带模块建立 CS连接, 将 PCM线路 信号转换为 CS语音码流, 通过无线宽带模块发送至无线宽带网络, 将来自 无线宽带模块的 CS语音码流转换为 PCM线路信号;
这里, 所述终端网关设备判断当前发起的是 VOIP呼叫还是 CS呼叫所 依据的信号可以是收到的 SPI信号,也可以是来自无线宽带模块的 AT命令 或 SIP信令。
所述无线宽带模块, 用于 VOIP电话的网络注册、 WAN连接及 CS电 话的建立, 并完成终端网关设备与无线宽带网络之间的语音码流的传输。
图 2为本发明中无线宽带模块具有语音 DSP功能时的结构框图, 如图 2所示, 包括: 终端网关设备、 无线宽带模块、 SWITCH, SLIC和话机等, 即在图 1所示的结构中增加 SWITCH; 其中,
所述 SWITCH, 用于 VOIP语音码流在终端网关设备与 SLIC之间的传 输, 还用于建立 SLIC到终端网关设备或无线宽带模块的 PCM线路, 用来
传输 CS语音码流;
所述终端网关设备,用于根据收到的信号判断当前发起的是 VOIP呼叫 还是 CS呼叫,如果是 VOIP呼叫,通过无线宽带模块建立 SIP连接,将 PCM 线路信号转换为 VOIP语音码流, 通过无线宽带模块发送至无线宽带网络, 或将来自无线宽带模块的 VOIP语音码流转换为 PCM线路信号;如果是 CS 呼叫, 通过无线宽带模块建立 CS连接, 将 PCM线路信号转换为 CS语音 码流, 通过无线宽带模块发送至无线宽带网络, 将来自无线宽带模块的 CS 语音码流转换为 PCM线路信号;
还用于确定传输 CS语音码流的是 SLIC到终端网关设备还是 SLIC到 无线宽带模块的 PCM线路,并控制 SWITCH建立对应传输 CS语音码流的 PCM线路;
所述无线带宽模块, 用于 VOIP电话的网络注册、 WAN连接及 CS电 话的建立, 并完成终端网关设备与无线宽带网络之间语音码流的传输; 还 用于 CS语音码流通过 SLIC到无线宽带模块间的 PCM线路传输时建立 CS 连接, 将 PCM线路信号转换为 CS语音码流发送至无线宽带网络, 将来自 无线宽带网络的 CS语音码流的转换为 PCM线路信号;
所述 SLIC, 用于话机与终端网关设备之间的 SPI信号的双向传递, 并 用于话机与 SWITCH之间 PCM线路信号的双向传递。
图 1、 图 2中所述的无线宽带模块可以为时分同步的码分多址技术(T D-SCDMA )、 宽带码分多址( WCDMA )、 码分多址( CDMA ) 2000以及 B 3G下的长期演进(LTE )、 全球微波互联接入(WIMAX )制式等不同协议 的通信模块, 也可以兼容基于分组域 IP的通用分组无线业务(GPRS )、 增 强型数据速率全球移动通讯系统演进技术(EDGE )及各种演进无线接入方 式, 以增加灵活度, 使本发明的网关系统能在不同地区使用。
如图 3所示, 运行于终端网关设备上的模块组成为: SLIC 驱动模块、
语音 DSP模块、 实时传送协议(RTP ) /RTP控制协议(RTCP )模块、 SIP 模块和语音应用模块; 其中,
所述 SLIC 驱动模块, 用于对来自 SLIC的 SPI信号进行检测, 判断当 前发起的是 VOIP呼叫还是 CS呼叫, 如果是 VOIP呼叫, 将 PCM线路信 号编码为 VOIP语音码流, 如果是 CS呼叫, 将 PCM线路信号编码为 CS 语音码流, 将该编码后的语音码流发送至语音 DSP模块, 并对来自于语音 DSP模块的 VOIP语音码流或 CS语音码流解码为 PCM线路信号;
所述语音 DSP模块, 用于对编码的语音码流进行压缩、 封装得到语音 数据包, 进行 VOIP呼叫时将语音数据包发送至 RTP/RTCP模块, 进行 CS 呼叫时将语音数据包发送至语音应用模块, 以及对来自于语音应用模块或
RTP/RTCP模块的语音数据包进行解包、 解压缩得到 VOIP语音码流或 CS 语音码流;
所述 RTP/RTCP模块, 用于 VOIP呼叫的语音数据包在 IP网络上的实 时传输控制, 主要是将来自于语音 DSP模块的语音数据包通过语音应用模 块发送至无线宽带模块, 再由无线宽带模块发送至 IP网络, 将通过语音应 用模块收到的语音数据包发送至语音 DSP模块;
所述 SIP模块, 用于完成 VOIP会话的创建、 修改及释放;
所述语音应用模块, 用于对来自于无线宽带模块的语音码流进行识别, 确定当前进行的是 VOIP呼叫还是 CS呼叫, 并在 VOIP呼叫时通过点对点 协议(PPP )为终端网关设备与无线宽带模块建立连接, 并将收到的语音数 据包发送至 RTP/RTCP模块, 在 CS呼叫时将收到的语音码流发送至语音
DSP模块。
图 2中所示的终端网关设备中还包括 Web用户管理界面模块, 用于在 SLIC驱动模块确定当前发起的是 CS呼叫时, 控制 SWITCH建立 SLIC到 终端网关设备的 PCM线路或 SLIC到无线宽带模块的 PCM线路,用来传输
CS语音码流。
这里, 如果通过 SWITCH建立 SLIC到无线宽带模块的 PCM线路, 则 以上各模块中将不再实现与 CS语音码流对应的功能。
为了对本发明所述的无线宽带网络下支持 VOIP、 CS 电话的系统和方 法的具体实施方式进行详细说明,现以终端网关设备平台是基于 TD-SCDM
A模式的语音设备为例, 说明如何利用单路 SLIC实现 VOIP、 CS电话业务 功能。 要实现本发明, 引入与上文所述相对应的模块组成如下:
终端网关设备以设备驱动为基础, 增加 SLIC驱动模块, 并在编译配置 选项中将该模块默认编译进内核,这样 SLIC驱动模块在终端网关设备的操 作系统启动后就被加载成为操作系统的字符设备, 并在整个操作系统运行 过程中无法卸载。 VOIP、 CS呼叫将分别通过语音 DSP模块和语音应用模 块以字符设备的方式打开、 关闭、 控制 SLIC驱动模块的使用。
无线宽带模块通过通用串行总线( USB )或通用异步收发装置( UART ) 等与终端网关设备相连。通过 USB将无线宽带模块与终端网关设备相连时, USB将被同时枚举成至少四个设备, 其分别用于 VOIP呼叫的调制器 /解调 器、 CS呼叫的基于 USB的语音通道、 终端网关设备与无线宽带模块之间 AT命令的通讯以及进行无线宽带模块调试的通道。在单 SLIC模式下, VOIP 的调制器 /解调器与 CS的基于 USB的语音通道无法同时启动。
语音 DSP模块位于操作系统(OS )、网络协议栈、网络地址转换(NAT ) 之上, 与它们的接口为 OS适配层。语音 DSP模块对经过 SLIC驱动模块编 码的语音码流进行压缩、 封装得到语音数据包, 以及对无线宽带网络上传 输来的语音数据包进行解包、 解压缩的处理。 这是一个独立的模块, 并调 用底层 SLIC驱动模块实现对语音码流的 PCM处理。
RTP/RTCP模块作为媒体协议进入设备驱动的文件系统,主要负责在 IP 网络上传输标准的语音数据包, RTP/RTCP遵循因特网标准。 RTP/RTCP模
块可以在 VOIP会话建立之前被作为进程启动,而不是在操作系统启动之后 就被加载执行, 这样可以节省对随机存取存储器和 CPU的消耗。
SIP模块是本系统的一个进程, 主要完成 VOIP会话的建立、 释放和控 制过程。 完整的 SIP系统包括四个组成部分: SIP用户代理、 SIP注册服务 器、 SIP代理服务器以及 SIP重定向服务器, 本发明方案中涉及的部分属于 SIP用户代理, SIP的其他三个服务器既可以使用 Internet现成的服务, 也 可以独立建立。
由于本发明方案中的 VOIP电话基于 SIP, 而 SIP需要进行相应配置, 因此可以在终端网关设备中引入 Web用户管理界面模块, Web用户管理界 面模块可以采用公共网关接口 (CGI )或 thttpd、 Go Ahead等架构, 该模块 实现的功能分为两大类: SIP服务器及端口的注册、 鉴权配置。 这样用户就 可以随时修改 SIP模块中的 SIP服务设置,选择不同的运营商提供差异化的 媒体服务。
语音应用模块是一个终端网关设备上的系统应用服务模块, 该模块对 VOIP呼叫和 CS呼叫起不同的作用。 对于 VOIP呼叫, 语音应用模块主要 完成 PPP网络的创建、释放和维护的任务,对于 CS呼叫,语音应用模块则 主要完成呼叫、 拆链和维护的功能。 该进程必须在操作系统启动后即被加 载, 并在操作系统的整个生命周期内都存在。
SWITCH是一个电路开关, 可以通过 Web用户管理界面模块对通用输 入 /输出 (GPIO ) 的控制来实现, 主要实现的功能是对 PCM线路的选择, 这样 CS语音码流就可以选择是进入终端网关设备的 PCM线路还是直接进 入无线宽带模块的 PCM线路。
基于上述系统, 对本发明的应用过程进行详细描述。
主叫实现步骤如下:
步骤 1 : 用户摘机, 摘机信号经 SPI发送到终端网关设备, 终端网关设
备中的 SLIC驱动模块给出摘机音, 摘机音通过 SLIC发送至话机, 由话机 播放给用户。
步骤 2: 用户通过话机以不同的拨打方式拨打 VOIP、 CS号码, 由终端 网关设备对拨号信令进行识别;
具体为: 用户通过话机按键拨打被叫方号码, 本发明中呼叫的被叫方 号码既可以是 VOIP号码, 也可以是 CS号码, 两者可以通过接入号码的不 同进行区分。 例如, 呼叫 CS号码时, 可与普通呼叫的拨打方式相同, 即直 接拨打 CS号码即可; 而呼叫 VOIP号码时, 可以通过拨打 VOIP号码与接 入号码的组合, 来与呼叫 CS号码相区分, 如在 VOIP号码前或后加拨特殊 标志符号予以区分。 例如, 呼叫 CS号码时与用户使用的固定、 移动电话号 码拨打方式相同,而呼叫 VOIP号码时可以在正常电话号码前加拨 "*"、 "#" 等标志。 VOIP、 CS两种不同的拨号信令经 SPI传输到终端网关设备, 并由 终端网关设备中的 SLIC驱动模块进行识别。
步骤 3: 用户与被叫方建立 VOIP、 CS通话连接, 各自的 PCM线路信 号被转换成相应的语音码流后传输给被叫方, 被叫方的语音码流被转换成
PCM线路信号后传输给主叫用户;
具体为: 如果呼叫的是 VOIP号码,终端网关设备中的语音应用模块将 在终端网关设备与无线宽带模块之间建立 PPP链接并通知 SIP模块建立 SIP 连接, SIP模块将向被叫方发起 SIP会话, 呼叫请求由 IP网络传送给被叫 方, 被叫方同意接受来电请求, 则会话建立成功, PCM线路信号传送到终 端网关设备, 此后终端网关设备中的语音 DSP模块将对 SLIC驱动模块编 码过的 VOIP语音码流进行压缩、组包操作, 并在 RTP/RTCP模块的控制下 与被叫方传输 VOIP数据 4艮文, 并且对来自于语音应用模块或 RTP/RTCP 模块的被叫方的语音数据包进行解包、解压缩得到 VOIP语音码流,再经解 码为 PCM线路信号后通过话机传递给主叫用户。
如果呼叫的是 CS号码,终端网关设备中的语音应用模块将向无线宽带 模块发起拨号连接请求, 拨号连接请求经无线宽带网络传到被叫方, 被叫 方接受来电请求,则通话连接建立,若无线宽带模块不具有语音 DSP功能,
PCM线路信号由终端网关设备转换为 CS语音码流, 通过无线宽带模块传 输到被叫方, 来自于被叫方的 CS语音码流经终端网关设备解码为 PCM线 路信号后传给主叫用户; 若无线宽带模块具有语音 DSP功能, 终端网关设 备确定传输 CS语音码流的是 SLIC到终端网关设备还是 SLIC到无线宽带 模块的 PCM线路, 并控制 SWITCH建立对应传输 CS语音码流的 PCM线 路,若 CS语音码流通过 SLIC到终端网关设备的 PCM线路进行传输, PCM 线路信号由终端网关设备转换为 CS语音码流,通过无线宽带模块传输到被 叫方, 来自于被叫方的 CS语音码流经终端网关设备解码为 PCM线路信号 后传给主叫用户, 若 CS语音码流通过 SLIC到无线宽带模块的 PCM线路 进行传输, 无线带宽模块将 PCM线路信号转换为 CS语音码流, 并传输到 被叫方, 将被叫方的 CS语音码流转换为 PCM线路信号后传给主叫用户。
步骤 4: 用户挂机, 终端网关设备将检测到挂断键, 并释放通话连接; 具体为: 主叫用户一旦挂断电话, 终端网关设备中的 SLIC 驱动模块 将检测到挂断键, VOIP电话将由 SIP模块完成会话释放, 并由语音应用模 块完成 PPP链接的拆链; CS电话将直接由语音应用模块完成电路的拆链。
被叫实现步骤如下:
步骤 1 : 终端网关设备接到主叫方的呼叫请求, 并对收到的呼叫请求进 行判断是 VOIP请求还是 CS请求;
具体为: 无线宽带模块接收到主叫用户的呼叫请求, 并通过 USB发送 到终端网关设备, 终端网关设备中的语音应用模块对呼叫请求进行判断, 若接收到 SIP信令则为 VOIP请求, 若收到 AT命令, 则为 CS请求。
步骤 2: 用户与主叫方建立 VOIP、 CS会话连接, SLIC将振铃信息和
电话号码传递给话机;
具体为: 用户接收到 VOIP电话请求,终端网关设备中的语音应用模块 在终端网关设备与无线宽带模块之间建立 PPP链接, 通知 SIP模块与主叫 方建立 SIP会话, 并通过 SLIC将振铃信息和电话号码传递给话机;
用户接收到 CS电话请求,通过终端网关设备中的语音应用模块接收到 无线宽带模块传来的呼叫请求,并由 SLIC将振铃信息和电话号码传递给话 机。
步骤 3: 用户摘机, VOIP、 CS语音码流被转换成 PCM线路信号, 再 通过 PCM线路传递给 SLIC, 最终通过话机传递给用户, 用户的 PCM线路 信号被转换成 VOIP、 CS语音码流后传输给主叫方;
具体为: 用户摘机, 如果是进行 VOIP通话, 则由终端网关设备中的 RTP/RTCP模块完成语音数据包的传递控制, 并由语音 DSP模块对语音数 据包进行解包、 解压缩处理, 再通过 PCM线路传递给 SLIC, 最终通过话 机传递给用户, 并把用户的 PCM线路信号进行编码, 由语音 DSP模块对 编码后的 VOIP语音码流进行压缩、 封装成语音数据包传给主叫方。
如果是进行 CS通话, 对于不具有语音 DSP功能的无线宽带模块, 语 音码流由无线宽带模块传输到终端网关设备, 然后被转换为 PCM线路信号 传递给 SLIC, 并通过话机的听筒或免提喇八放给用户, 并由终端网关设备 把用户的 PCM线路信号转换成 CS语音码流后由无线宽带模块传给主叫方; 对于具有语音 DSP功能的无线宽带模块, 终端网关设备确定传输 CS语音 码流的 PCM线路, 若通过无线宽带模块自带的 PCM线路进行传输, 无线 宽带模块将 CS语音码流转换成 PCM线路信号,经过 SWITCH传递给 SLIC, 并通过话机的听筒或免提喇八放给用户,并把通过 SLIC传来的用户的 PCM 线路信号经过 SWITCH传递给无线宽带模块, 经无线宽带模块转换成 CS 语音码流后传给主叫方。
步骤 4: 用户挂机, 无线宽带模块将接收的拆链请求发送给终端网关设 备, 终端网关设备进行会话释放, 整个呼叫过程结束;
具体为: 主叫用户一旦挂机, 无线宽带模块会将从被叫方接收的拆链 请求发送给终端网关设备中的语音应用模块。对于 VOIP电话,语音应用模 块通知 SIP模块对会话进行释放; 对于 CS电话, 语音应用模块进行电路拆 除, 由此整个呼叫过程结束。
本发明同样适用于各种支持分组域、 电路域的无线网络, 无线网络可 包括 TD-SCDMA、 WCDMA、 CDMA2000、 WIMAX、 LTE、 GPRS, EDGE, 高速分组接入网 (HSPA )等。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围, 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等, 均应包含在本发明的保护范围之内。
Claims
1、 一种支持基于网络层协议的语音 VOIP、 电路交换 cs电话的系统, 其特征在于, 该系统包括: 终端网关设备、 无线宽带模块和用户线接口电 路 SLIC; 其中,
所述无线宽带模块, 用于 VOIP电话的网络注册、 无线局域网 WAN连 接及 CS电话的建立,并完成终端网关设备与无线宽带网络之间语音码流的 传输;
所述终端网关设备,用于根据收到的信号判断当前发起的是 VOIP呼叫 还是 CS呼叫, 如果是 VOIP呼叫, 通过无线宽带模块建立会话初始化协议 SIP连接, 将脉码调制 PCM线路信号转换为 VOIP语音码流, 通过无线宽 带模块发送至无线宽带网络或将来自无线宽带模块的 VOIP语音码流转换 为 PCM线路信号, 如果是 CS呼叫, 通过无线宽带模块建立 CS连接, 将 PCM线路信号转换为 CS语音码流, 通过无线宽带模块发送至无线宽带网 络或将来自无线宽带模块的 CS语音码流转换为 PCM线路信号;
所述 SLIC, 用于话机与终端网关设备之间的串行外围设备接口 SPI信 号的双向传递,并用于话机与终端网关设备之间的 PCM线路信号的双向传 递。
2、 根据权利要求 1所述的支持 VOIP、 CS电话的系统, 其特征在于, 所述终端网关设备包括: SLIC 驱动模块、 语音数字信号处理 DSP模块、 实时传送协议 RTP/RTP控制协议 RTCP模块、 SIP模块和语音应用模块; 其中,
所述 SLIC 驱动模块, 用于对来自 SLIC的 SPI信号进行检测, 判断当 前发起的是 VOIP呼叫还是 CS呼叫, 将 PCM线路信号编码为与呼叫类型 相对应的 VOIP语音码流或 CS语音码流, 将该编码后的语音码流发送至语 音 DSP模块, 并对来自于语音 DSP模块的 VOIP语音码流或 CS语音码流
解码为 PCM线路信号;
所述语音 DSP模块, 用于对编码的语音码流进行压缩、 封装得到语音 数据包, 进行 VOIP呼叫时将语音数据包发送至 RTP/ RTCP模块, 进行 CS 呼叫时将语音数据包发送至语音应用模块, 以及对来自于语音应用模块或 RTP/RTCP模块的语音数据包进行解包、 解压缩得到 VOIP语音码流或 CS 语音码流;
所述 RTP/ RTCP模块,用于 VOIP呼叫的语音数据包在 IP网络上的实 时传输控制, 主要是将来自于语音 DSP模块的语音数据包通过语音应用模 块发送至无线宽带模块, 再由无线宽带模块发送至 IP网络, 将通过语音应 用模块收到的语音数据包发送至语音 DSP模块;
所述 SIP模块, 用于完成 VOIP会话的创建、 修改及释放;
所述语音应用模块, 用于对来自于无线宽带模块的语音码流进行识别, 确定当前进行的是 VOIP呼叫还是 CS呼叫, 并在 VOIP呼叫时通过点对点 协议 PPP为终端网关设备与无线宽带模块建立连接, 并将收到的语音数据 包发送至 RTP/RTCP模块,在 CS呼叫时将收到的语音码流发送至语音 DSP 模块。
3、 根据权利要求 1或 2所述的支持 VOIP、 CS电话的系统, 其特征在 于, 所述终端网关设备还包括 Web用户管理界面模块, 用于对 SIP服务器 及端口的注册、 鉴权配置。
4、 一种支持 VOIP、 CS电话的系统, 其特征在于, 包括: 终端网关设 备、 无线宽带模块、 SLIC和开关 SWITCH; 其中,
所述无线宽带模块, 用于 VOIP电话的网络注册、 WAN连接及 CS电 话的建立, 并完成终端网关设备与无线宽带网络之间语音码流的传输; 还 用于 CS语音码流通过 SLIC到无线宽带模块间的 PCM线路传输时建立 CS 连接, 将 PCM线路信号转换为 CS语音码流发送至无线宽带网络, 将来自
无线宽带网络的 CS语音码流的转换为 PCM线路信号;
所述终端网关设备,用于根据收到的信号判断当前发起的是 VOIP呼叫 还是 CS呼叫,如果是 VOIP呼叫,通过无线宽带模块建立 SIP连接,将 PCM 线路信号转换为 VOIP语音码流, 通过无线宽带模块发送至无线宽带网络, 或将来自无线宽带模块的 VOIP语音码流转换为 PCM线路信号;如果是 CS 呼叫, 通过无线宽带模块建立 CS连接, 将 PCM线路信号转换为 CS语音 码流, 通过无线宽带模块发送至无线宽带网络, 将来自无线宽带模块的 CS 语音码流转换为 PCM线路信号;
还用于确定传输 CS语音码流的是 SLIC到终端网关设备还是 SLIC到 无线宽带模块的 PCM线路,并控制 SWITCH建立对应传输 CS语音码流的 PCM线路;
所述 SLIC, 用于话机与终端网关设备之间的 SPI信号的双向传递, 并 用于话机与 SWITCH之间 PCM线路信号的双向传递;
所述 SWITCH, 用于 VOIP语音码流在终端网关设备与 SLIC之间的传 输, 还用于建立 SLIC到终端网关设备或无线宽带模块的 PCM线路, 用来 传输 CS语音码流。
5、 根据权利要求 4所述的支持 VOIP、 CS电话的系统, 其特征在于, 所述的终端网关设备中包括: SLIC 驱动模块、语音 DSP模块、 RTP/ RTCP 模块、 SIP模块、 语音应用模块和 Web用户管理界面模块; 其中,
所述 SLIC 驱动模块, 用于对来自 SLIC的 SPI信号进行检测, 判断当 前发起的是 VOIP呼叫还是 CS呼叫, 将 PCM线路信号编码为与呼叫类型 相对应的 VOIP语音码流或 CS语音码流, 将该编码后的语音码流发送至语 音 DSP模块, 并对来自于语音 DSP模块的 VOIP语音码流或 CS语音码流 解码为 PCM线路信号;
所述语音 DSP模块, 用于对编码的语音码流进行压缩、 封装得到语音
数据包, 进行 VOIP呼叫时将语音数据包发送至 RTP/ RTCP模块, 进行 CS 呼叫时将语音数据包发送至语音应用模块, 以及对来自于语音应用模块或 RTP/RTCP模块的语音数据包进行解包、 解压缩得到 VOIP语音码流或 CS 语音码流;
所述 RTP/ RTCP模块,用于 VOIP呼叫的语音数据包在 IP网络上的实 时传输控制, 主要是将来自于语音 DSP模块的语音数据包通过语音应用模 块发送至无线宽带模块, 再由无线宽带模块发送至 IP网络, 将通过语音应 用模块收到的语音数据包发送至语音 DSP模块;
所述 SIP模块, 用于完成 VOIP会话的创建、 修改及释放;
所述语音应用模块, 用于对来自于无线宽带模块的语音码流进行识别, 确定当前进行的是 VOIP呼叫还是 CS呼叫, 并在 VOIP呼叫时通过 PPP为 终端网关设备与无线宽带模块建立连接, 并将收到的语音数据包发送至
RTP/RTCP模块, 在 CS呼叫时将收到的语音码流发送至语音 DSP模块; 所述 Web用户管理界面模块, 用于在 SLIC驱动模块确定当前发起的 是 CS呼叫时,控制 SWITCH建立 SLIC到终端网关设备的 PCM线路或 SLIC 到无线宽带模块的 PCM线路, 用来传输 CS语音码流。
6、 根据权利要求 5所述的支持 VOIP、 CS电话的系统, 其特征在于, 所述 Web用户管理界面模块, 还用于对 SIP服务器及端口的注册、 鉴权配 置。
7、 根据权利要求 4、 5或 6所述的支持 VOIP、 CS电话的系统, 其特 征在于, 所述无线宽带模块为: 时分同步的码分多址技术 TD-SCDMA、 或 宽带码分多址 WCDMA、或码分多址 CDMA2000以及超三代移动通信系统 B3G下的长期演进 LTE、 或全球微波互联接入 WIMAX制式等不同协议的 通信模块、 或兼容基于分组域 IP的通用分组无线业务 GPRS、 或增强型数 据速率全球移动通讯系统演进技术 EDGE及各种演进无线接入方式。
8、 一种支持 VOIP、 CS电话的方法, 其特征在于, 包括主叫和被叫两 个过程; 其中, 主叫过程包括以下步骤:
用户摘机, 摘机信号经 SPI发送到终端网关设备, 终端网关设备给出 摘机音, 并通过 SLIC发送至话机, 由话机播放给用户;
用户通过话机以不同的拨打方式拨打 VOIP、 CS号码, 由终端网关设 备对拨号信令进行识别;
用户与被叫方建立 VOIP、 CS通话连接, 各自的 PCM线路信号被转换 成相应的语音码流后传输给被叫方,被叫方的语音码流被转换成 PCM线路 信号后传输给主叫用户;
用户挂机, 终端网关设备将检测到挂断键, 并释放通话连接; 被叫过程包括以下步骤:
终端网关设备接到主叫方的呼叫请求, 并对收到的呼叫请求进行判断 是 VOIP请求还是 CS请求;
用户与主叫方建立 VOIP、 CS会话连接, SLIC将振铃信息和电话号码 传递给话机;
用户摘机, VOIP, CS语音码流被转换成 PCM线路信号, 再通过 PCM 线路传递给 SLIC, 最终通过话机传递给用户, 用户的 PCM线路信号被转 换成 VOIP、 CS语音码流后传输给主叫方;
用户挂机, 无线宽带模块将接收的拆链请求发送给终端网关设备, 终 端网关设备进行会话释放, 整个呼叫过程结束。
9、 根据权利要求 8所述的支持 VOIP、 CS电话的方法, 其特征在于, 主叫过程中所述用户与被叫方建立 VOIP、 CS通话连接, 双方互相传输语 音码流的过程, 具体为:
终端网关设备通过无线宽带模块将拨号连接请求发送到被叫方, 被叫 方同意接受则通话建立成功, 如果是进行 VOIP通话, PCM线路信号被终
端网关设备转换成 VOIP语音数据包传输给被叫方, 来自于被叫方的 VOIP 语音数据包由无线宽带模块发送到终端网关设备,并被转换成 PCM线路信 号后传输给主叫用户;
如果是进行 CS通话,若 CS语音码流通过 SLIC到终端网关设备的 PCM 线路进行传输, PCM线路信号由终端网关设备转换为 CS语音码流, 通过 无线宽带模块传输到被叫方,来自于被叫方的 CS语音码流经终端网关设备 解码为 PCM线路信号后传给主叫用户, 若 CS语音码流通过 SLIC到无线 宽带模块的 PCM线路进行传输,无线带宽模块将 PCM线路信号转换为 CS 语音码流, 并传输到被叫方, 将被叫方的 CS语音码流转换为 PCM线路信 号后传给主叫用户。
10、 根据权利要求 8所述的支持 VOIP、 CS电话的方法, 其特征在于, 被叫过程中所述用户摘机, 双方互相传输 VOIP、 CS语音码流的过程, 具 体为:
用户摘机, 如果是进行 VOIP通话, 终端网关设备将 VOIP语音数据包 转换成 PCM线路信号, 通过 PCM线路传递给 SLIC, 由话机传递给用户, 用户的 PCM 线路信号由终端网关设备转换成 VOIP语音数据包传给主叫 方;
如果是进行 CS通话, 若 CS语音码流通过无线宽带模块的 PCM线路 进行传输, CS 语音码流经无线宽带模块传输到终端网关设备, 被转换为 PCM线路信号传递给 SLIC, 并通过话机播放给用户, 并由终端网关设备把 用户的 PCM线路信号转换成 CS语音码流后由无线宽带模块传给主叫方; 若 CS语音码流通过无线宽带模块自带的 PCM线路进行传输, 无线宽带模 块将 CS语音码流转换成 PCM线路信号, 最终通过话机播放给用户, 并把 用户的 PCM线路信号经过传递给无线宽带模块, 并转换成 CS语音码流后 传给主叫方。
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CN1722697A (zh) * | 2004-07-13 | 2006-01-18 | 华为技术有限公司 | 一种将呼叫转移为因特网协议语音业务的方法 |
CN101277327A (zh) * | 2007-03-29 | 2008-10-01 | 芯传国际股份有限公司 | 双模通讯装置及其驱动方法 |
CN101494916A (zh) * | 2009-03-09 | 2009-07-29 | 中兴通讯股份有限公司 | 一种支持voip、cs电话的系统和方法 |
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CN101494916A (zh) | 2009-07-29 |
EP2408163B1 (en) | 2017-01-11 |
EP2408163A4 (en) | 2013-09-04 |
EP2408163A1 (en) | 2012-01-18 |
CN101494916B (zh) | 2011-03-16 |
WO2010102498A8 (zh) | 2011-08-11 |
US8553621B2 (en) | 2013-10-08 |
US20110299471A1 (en) | 2011-12-08 |
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