CN1753443A - Device for producing ringing sound - Google Patents

Abstract

The invention discloses a device for generating a ringing sound, which includes: a judging part for judging whether to generate a ringing sound after identifying the network type to which a terminal requesting call establishment belongs; and a signal processor for generating a ringing sound according to the type of the network. The ringing sound data to be sent to the second terminal, and the ringing sound data is inserted into the call setup response message. The device for generating the ringing sound provided by the invention improves the efficiency of the network structure.

Description

A device that produces a ringing sound

technical field

The invention relates to a network communication device, in particular to a terminal device for generating and sending ringing sounds.

Background technique

If the calling party uses a wired or wireless telephone to dial a call, the calling party hears the ringing sound used to inform that the call signal is being sent to the called party, when the communication system terminals of the public switched telephone network (PSTN) try to make a call connection , the switching system of the called party terminal generates a ringing sound and sends the ringing sound to the calling party terminal.

FIG. 1 shows a communication system using a traditional Internet Protocol Telephony (IP Telephony) in an existing communication network. The call connection method according to the PSTN E.164 standard is based on the method of connecting the calling party and the called party using the phone number of the called party. That is, if the calling party inputs the phone number of the designated called party, the PSTN establishes a communication path connecting the calling party and the designated called party using the phone number input by the calling party.

Unlike communication networks (such as PSTN) constructed mainly for voice communications, data communications networks constructed for data communications are classified in size into local area networks (LANs), wide area networks (WANs), and the Internet. Most data communication networks transmit/receive data in the form of data packets according to the characteristics of the implemented data communication protocol.

Voice may also be transmitted using a data communications network, such as an Internet Protocol (IP) network. Voice transmission using commercial packet data networks is known as telephony. For example, if the calling party connects to the data communication network of the adjacent IP telephone company through the existing PSTN and enters the phone number of the called party, the calling party connects to the data communication network of another IP telephone company near the called party through the IP network. communication network, and the data communication network of the IP telephone company connects the calling party to the called party through another PSTN.

At present, personal computer (PC)-PsTN phone and IP phone-IP phone have been proposed, please refer to the proposal as the international standard H.323 for voice communication of PC-PC, PC-PSTN, and IP phone-IP phone.

Recommendation H.323 is a standard of the International Telecommunication Union's Telecommunication Standardization Sector (ITU-T) for sending multimedia videoconferencing data over a packet-switched type network, such as Transmission Control Protocol/Internet Protocol (TCP/IP). As shown in Figure 1, if the calling party of the PSTN phone calls the called party of the IP phone, the PSTN phone is connected to the IP network through the trunk gateway, and the trunk gateway is connected to the IP network through the soft switch or the IP phone server Connect to an IP phone. That is, the connection between the PSTN phone and the IP phone is formed through the path ①→②→③→④→⑤→⑥→⑦→⑧→⑨→⑩, as illustrated in FIG. 1 .

An IP telephony server includes a gatekeeper, a proxy server, and a call controller. According to the H.323 recommendation, the gatekeeper is responsible for E.164/IP address translation, admission control, bandwidth control, call control, call routing/control resource usage, and security functions.

In Voice over Internet Protocol (VoIP), a proxy server stores call management request messages received from a user agent (UA), such as call setup, call cancel, call termination, and the like. The proxy server simultaneously sends the call management request messages to different addresses of the registered Session Initiation Protocol (sIP) and thus to the same user. Also, if the proxy server receives the user agent's response to the call management request, the proxy server sends the best response to the user agent (UA), and performs logout processing on other messages generated at the same time.

A gateway connects a data communication network with a switched network (eg PSTN). In addition, the gateway provides bandwidth/media control and protocol/media conversion functions. A gateway is a network point and serves as an entrance to another network, and can be classified into three types: namely, a trunk gateway for connecting a switching system, an access gateway for directly connecting a terminal, and a residential gateway for home use.

The softswitch shown in Figure 1 is a platform used as a bridge to other kinds of signaling systems and controls various types of media gates. A soft switch is a software used as a switching system in an existing packet switching network. It is located at the upper layer of the gatekeeper in the H.323 recommendation and can manage communication information (such as voice, data, images, etc.) on the Internet as a whole Manage integrated private switches.

In the case of a call from a PSTN phone to an IP phone, in order to provide a ring tone to the PSTN phone, an IP telephony server or softswitch connected to the IP phone will generate the ring tone, but no IP telephony server and softswitch have the capability to generate the ring tone module. As a result, ringtones cannot be sent to PSTN phones.

Traditionally, when trying to make a call connection between IP phones, the calling party of the IP phone mainly generates a ringing sound and provides the ringing sound to the user of the calling party, and, when trying to make a call connection from the IP phone to the PSTN phone , the gateway sends the ring tone to the IP phone. Unfortunately, however, the trunk gateways that connect together PSTN phones and IP phones do not have a module to generate ringing tones. Likewise, ringtones cannot be sent from IP phones to PSTN phones.

When attempting to make a call connection between PSTN phones, the called party's mobile switching center generates and sends a ringing tone. When a connection is made between IP phones, the access gateway generates a ring tone and sends the ring tone to the calling party of the IP phone. Otherwise, the called party of the IP phone itself generates a ringing tone and provides it to the calling party of the IP phone. Unlike an access gateway connected to a terminal, a trunk gateway used to connect between switching systems does not include a device that generates a ringing sound.

But in current systems, when a call is made from a PSTN phone to an IP phone, the gateway between the PSTN and the packet data communication network may not generate a ringing sound. That is, the calling party of the PSTN phone may not be able to hear any sound (ie, the call signal) because the trunk gateway making the connection at the switching system does not include a device for generating the ringing sound. In other words, the calling party of the PSTN phone cannot recognize whether a call attempt is in progress until the called party of the IP phone picks up the phone.

Therefore, when making a call from the IP phone to the PSTN phone, the called party of the IP phone generates a ringing sound for the party. But when a call is made from a PSTN phone to an IP phone, the trunk gateway may not generate a ring tone and send the ring tone to the calling party of the PSTN phone.

Contents of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for transmitting ringing sounds which substantially obviates the above-mentioned problems due to limitations and disadvantages of the related art.

Technical scheme of the present invention comprises:

A device for generating a ringing sound, which includes: a judging section for judging whether to generate a ringing sound after identifying a network type to which a terminal requesting call establishment belongs; and a signal processor for generating the The ringing tone data is sent to the second terminal, and the ringing tone data is inserted into the call setup response message.

The apparatus, wherein the response message includes at least one data packet based on the real-time transport protocol.

Said device, wherein, if the type of the network is the public switched telephone network, the signal processor generates the ringing tone data.

The device, including:

The memory is used to store the ringing sound data; the signal processor reads the stored ringing sound data according to the first-in-first-out method, so as to insert the ringing sound data into the response message.

The apparatus, wherein the type of network is identified based on a specific message sent from the network.

In the device, the specific message notifies the network that it does not have the function of generating ringing sound data.

The device for generating the ringing sound provided by the invention improves the efficiency of the network structure.

Description of drawings

Fig. 1 is the general component diagram of the conventional communication network that connects IP phone to PSTN phone of the device of the present invention;

Fig. 2 is the IP telephone schematic diagram that has ringing sound generation equipment in the device of the present invention;

Fig. 3 is the generation method synoptic diagram of the IP telephone ringing sound of device of the present invention; And

Fig. 4 is a schematic diagram of the ringing sound transmission method using RTP packets of the device of the present invention.

Specific embodiments

Various preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 2, according to one or more embodiments of the present invention, the IP phone includes: a handset 10 for sending/receiving the voice of the calling party/called party, for sending/receiving voices other than the handset 10 The microphone n and the speaker 12 for voice, the analog-digital/digital-analog (AD/DA) conversion section 13 in the handset 10, the microphone 11, the speaker 12 and the digital signal processor 14 are constructed.

The digital signal processor 14 is used for converting analog signals into digital signals and AD/DA converting digital signals into analog signals. The digital signal processor 14 is electronically connected to the handset 10, the microphone n and the speaker 12. In some embodiments, the digital signal processor 14 also improves IP phone reception and generates ringing tones.

IP telephone can comprise simultaneously: key-in part 15, be used for inputting the telephone number of called party and/or other function keys on it, display part 16, be used for displaying telephone number and/or IP telephone according to other function keys In the current manner, the memory 17 is used to store instruction information for operating the IP phone, and the control section 18 is used to control the overall operation of the IP phone.

The apparatus of the present invention includes a ringing sound generation judging section 19 for judging whether a ringing sound is generated. For example, a power supply circuit 20 for supplying power to an IP phone is provided. Ethernet 21 is provided for connecting IP telephony and computer communication networks.

For the IP phone with the ring tone generating device constructed above according to the present invention, as shown in FIG. 2, if the calling party's PSTN phone dials the IP phone, a call setup message is sent from the PSTN gateway to the called party's IP phone.

After determining the telephone number of the calling party's PSTN phone, or after confirming a designated message sent from the PSTN gateway, the ringing sound generation judgment section 19 determines whether to generate a ringing sound to the calling party's PSTN phone. The ringing sound generation judgment section 19 notifies the control section 18 of the judgment result.

The calling party's telephone number of the device of the present invention is the telephone number of a PSTN telephone connected to the PSTN, and is identified by determining a prefix of the PSTN telephone number composed of a country code, an area code and a telephone number. Whether to generate a ringing tone is judged according to the prefix of the confirmed phone number.

In addition, since the IP telephone number is set corresponding to each region (or country), if it is determined to be a prefix of the IP telephone number, no ringing sound is generated. That is, the ringing sound generation judging section 19 identifies the requester of the call connection, such as a PSTN phone, an IP phone or a mobile phone, according to the prefix value of the phone number of the call setup message. Therefore, the control section 18 is notified whether or not a ringing sound is generated in the IP telephone. If a designation message is included that informs the PSTN gateway connected to the PSTN phone that the ringing sound generating device is not sent to the IP phone, the ringing sound generation judging section 19 of the IP phone judges that a ringing sound is generated, and notifies the control section 18 accordingly. If by determining the prefix of the calling party's phone number or determining the specified message from the PSTN gateway, it is determined that the IP phone itself produces a ringing tone, then the control section 18 controls the digital signal processor (DSP) 14 to produce a ringing tone, and the control buffer (i.e. Memory) stores the ringing sound produced by DSP 14.

When a response message in response to the call setup message is sent to the calling party's PSTN telephone, the control section 18 reads the ringing tone from the buffer 17, inserts the ringing tone into the packet data, and transmits the inserted data packet data through the Ethernet 21 to the PSTN call. Meanwhile, the ringing sound generation judging section 19 may be realized by hardware or by software, but when the ringing sound generation judging section 19 is realized by software, the ringing sound generation judging section 19 may be realized as an additional function of the control section 18.

As shown in FIG. 3, in the apparatus of the present invention, the IP telephone may include a ring tone generating device for generating a ring tone, so as not to use a PSTN switch or an access gateway to transmit the calling party's PSTN telephone. If the PSTN phone of the calling party dials to the IP phone of the called party, the PSTN gateway of the PSTN phone sends the call setup message to the real-time transport protocol of the IP phone server (including proxy server, gatekeeper, and call controller, etc.) (RTP) (Real-time Transport Protocol) port (511), and the called party (such as an IP phone) receives the call setup message.

The system used to connect the PsTN and the IP network (such as a gateway and/or a softswitch) informs the called party's IP phone about its port. If the call set-up message is received by the IP phone, the ringing sound of the IP phone produces a judging part 19 to determine whether the call setting-up message is generated from the PSTN phone, and if so, the control part 18 of the IP phone controls the DsP14 to generate the ringing sound (512) buffer Store the generated ringing tone.

If the generated ringing tone is stored in the buffer 17, the IP phone sends a response message (eg some kind of real-time protocol data packet) to the PSTN phone to the call setup message. After reading the ringtone from the buffer 17, the IP phone sends a response message including the ringtone to the port notified by the gateway and/or the softswitch.

That is, when DSP 14 sends an RTP packet to a PSTN phone to a PSTN gateway and/or soft switch, DSP 14 inserts ringtone data into the voice packet field of the RTP packet (513). Gateways and/or softswitches convert RTP packets received from IP phones into signals that can be recognized by PsTN phones. The signal includes the ringing tone of the PSTN phone to be sent to the calling party (514). When the ring tone is being sent to the PSTN phone, if the called party's IP phone is off-hook (ie answered) (515), a connection will be established between the PSTN phone and the IP phone. As described above, according to the present invention, an IP telephone having a DSP 14 generates a ringing sound, and carries ringing sound data on an RTP packet sent in the process of forming a response message to a call setup message. Therefore, the user of the PSTN phone can hear the ringing sound even though the trunking gateway does not generate the ringing sound.

As shown in FIG. 4, in the case of making a call from a PSTN phone to an IP phone, a ringing tone is generated by the called party's IP phone and sent to the calling party's PSTN phone. The called party's IP phone may include an Internet access system such as a cable modem, LAN, Asymmetric Digital Subscriber Line (ADSL), and the like.

As shown in Figure 1, the network structure of forming a call from a PSTN phone to an IP phone includes: the PSTN phone of the calling party connected to the PSTN, the trunk gateway connecting the PSTN and the IP network, connected to the IP phone server (such as a proxy server) , gatekeeper, and call controller) end-side IP phones, and soft switches used as IP phone servers and packet-switched network switches.

A gateway is a network point that manages another network entry, and a proxy server is used to store call management request messages received from a user agent (UA), such as call establishment, call cancellation, and call termination. The call management request message is sent to different addresses of the Session Initiation Protocol (SIP) of the same user registered everywhere. The Softswitch is a complete platform for bridging with other types of signaling systems and controlling various types of media gates. If the PSTN phone makes a call to the IP phone using the network structured above, it will set up an active call task for the call (step 520). Systems connecting PSTN and IP networks, such as gateways and soft switches, insert a message for notifying the called party IP phone of its own port information into the call setup message when it sends the call setup message to the IP phone.

As described above, if the call task step is performed, the called party's IP phone determines whether a call setup message is received (step 21). If the call setup message is received, the DSP in the IP phone generates and stores the ringing sound in the buffer according to the call setup message requested by the PSTN phone. After generating the ringing tone, the IP phone inserts the ringing tone into the RTP packet (step 523), and sends the RTP packet to the relay gateway as a network point in a first-in-first-out manner (step 524).

The RTP packet sent to the trunk gateway is converted into a ring tone by the trunk gateway or soft switch as a bridge device, and then the ring tone is sent to the calling party's PSTN phone. The ringing sound is inserted into the response message of the call setup message, and then the response message is sent to the PSTN phone of the calling party through the sending port of the trunk gateway or the soft switch. In some embodiments, the calling party's terminal is a PSTN phone or a phone connected to a gateway that does not have a voice generating device.

As described above, the present invention is not limited to Voice over IP (VoIP) which integrates voice and data into IP protocol packets and actually transmits the packets, but can be applied to Session Initiation Protocol (SIP). According to the ringing sound transmission method of the IP telephone using the real-time transport protocol (RTP), even if a gateway device that cannot generate the ringing sound is included in the connection network of the PSTN and the IP network, the ringing sound can be transmitted using the RTP packet from the destination.

Therefore, when a call is made using a network including devices that may not generate ringing tones, ringing tones can be provided to PSTN phones so that the efficiency of the network structure can be improved.

It should be understood that the above descriptions for specific implementations are relatively detailed, and should not be considered as limiting the scope of the patent protection of the present invention. The scope of protection of the patent protection of the present invention should be determined by the appended claims.

Claims (6)

1. A kind of device that produces ringing sound, it is characterized in that, comprise: be used for judging whether to produce the judgment part of ringing sound after identifying the network type that the terminal that the terminal of identification request call establishment belongs to; And a signal processor, for according to network The type generates ringing sound data to be sent to the second terminal, and inserts the ringing sound data into a call setup response message. 2. The apparatus according to claim 1, wherein the response message comprises at least one real-time transport protocol-based data packet. 3. The apparatus according to claim 1, wherein the signal processor generates the ring tone data if the type of the network is a public switched telephone network. 4. The device of claim 1, comprising: The memory is used to store the ringing sound data; the signal processor reads the stored ringing sound data according to the first-in-first-out method, so as to insert the ringing sound data into the response message. 5. The apparatus of claim 1, wherein the type of network is identified based on a specific message sent from the network. 6. The device according to claim 5, wherein the specific message informs that the network does not have the function of generating ringing sound data.

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