JP4118897B2 - Image transmission device - Google Patents

Description

  The present invention relates to an image transmission apparatus, and more particularly to an image transmission apparatus suitable for a monitoring system that distributes video captured by a camera to a mobile phone terminal.

  With the widespread use of IP networks, multimedia information communication has become possible, and calls between telephone terminals using VoIP (Voice over IP) have become possible. For example, in Japanese Patent Application Laid-Open No. 2003-23504 (Patent Document 1), when audio for video and audio for call are simultaneously delivered to one terminal, that is, a user views a TV video on a terminal screen. There has been proposed a voice control method that enables a user to make a call while viewing video by automatically attenuating and outputting video audio when a call is received.

  In addition, it has become possible to remotely monitor the video of a TV camera installed at a monitoring site via an IP network. However, in the conventional remote monitoring system, the video of the TV camera installed at the monitoring site is transmitted to the remote monitoring center by the image transmission device, and the staff who is resident in the monitoring center outputs each display site to the display device. It is configured to observe images.

JP 2003-23504 A

  In a system configuration for monitoring images of TV cameras arranged at various locations in the monitoring center, it is necessary to have a dedicated staff stationed at the monitoring center. For example, when a monitor screen is monitored in a security room in a facility such as a factory, a company, or an office building, there is a problem that depending on the number of security guards, the monitoring system is disrupted while the security guards go out or patrol.

  The above problem is, for example, when using a mobile phone terminal capable of displaying an image, a security guard or a related person connects his / her mobile phone terminal to the image transmission device, and video of the monitoring site is displayed on the terminal screen at any time. It can be reduced by making it visible. If you use a mobile phone terminal, you can know the status of the monitoring site even when you are away from home, so you can reduce the number of people required for monitoring.

  However, in the system configuration in which the video transmitted from the image transmission device is observed with a mobile phone terminal, for example, when an abnormality is found at the monitoring site and this is to be notified to another person who is an emergency contact, It is necessary to make a call to the contact telephone terminal after disconnecting the communication with the image transmission apparatus. In this case, since the current status of the monitoring site cannot be seen on the terminal screen while talking with the contact information, there is a problem that the change in the situation cannot be grasped and an appropriate response cannot be taken.

An object of the present invention is to provide an image transmission apparatus that allows a user of a mobile phone terminal to make a call with a contact while maintaining an image distribution service.
Another object of the present invention is to provide an image transmission apparatus in which a user of a mobile phone terminal can make an emergency call with a contact while observing a change in the status of a monitoring site.

  In order to achieve the above object, the image transmission apparatus of the present invention includes a memory for storing address information of a contact telephone terminal registered in advance, and the mobile phone terminal in response to a call request from the mobile phone terminal to the contact. Means for setting a call connection with the contact telephone terminal having the address information indicated by the memory while maintaining the image distribution service to the telephone terminal, and the voice packet received from the portable telephone terminal Voice packet relay means for relaying voice packets received from the contact telephone terminal and relaying voice packets to the mobile telephone terminal is provided.

  In addition, when the image transmission apparatus of the present invention receives a call request message to a contact from a mobile phone terminal in an image distribution service, the call request message is maintained while maintaining the image distribution service to the mobile phone terminal. Means for setting up a call connection with the contact telephone terminal in accordance with the contact address information indicated by, and the voice packet received from the mobile phone terminal is relayed to the contact telephone terminal, from the contact telephone terminal Voice packet relay means for relaying received voice packets to the mobile phone terminal is provided.

More specifically, an image transmission apparatus according to an embodiment of the present invention generates an image distribution control unit that generates image packets including image information captured by a camera, and generates audio packets that include sound collection information as necessary. Including control information among the voice distribution control unit, the transmission control unit that transmits the image packet and the voice packet generated by the image distribution control unit and the voice distribution control unit to the IP network, and the packet received from the IP network The control packet is input to the voice distribution control unit, and the voice packet including the voice information includes a reception control unit that accumulates in the relay packet buffer.
In response to the call request from the mobile phone terminal to the contact, the voice delivery control unit maintains a video packet delivery service to the mobile phone terminal by the image delivery control unit, and a call request (message ) Or the address information registered in advance in the image transmission device, a call connection is set up with the contact telephone terminal, and instead of generating a voice packet, it is read from the relay packet buffer. The header conversion of the issued voice packet is executed, the voice packet received from the mobile phone terminal is converted to the contact telephone terminal, and the voice packet received from the contact telephone terminal is converted to the mobile phone terminal. To the transmission control unit.

  In one embodiment of the present invention, a command menu is distributed in a web page format from an image transmission apparatus to a mobile phone terminal when connected to the mobile phone terminal, and a user of the mobile phone terminal performs a request selection operation from the command menu, A call request is issued to the contact described above.

  According to the present invention, since the mobile phone terminal and the contact phone terminal can be connected while maintaining the image delivery service to the mobile phone terminal, the mobile phone user can check with the parties concerned while auditing the status change of the monitoring site. Appropriate conversation. In addition, by predetermining the address information to be contacted for each monitoring site, when a call request from the mobile phone terminal to the contact occurs, it automatically connects to the contact terminal via the image transmission device. Since the mobile phone terminal can make a call with the contact, even if an emergency occurs, it is possible to avoid an erroneous call due to the terminal user's turnover and to respond quickly.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a communication network to which the image transmission apparatus of the present invention is applied.
The communication network shown here includes an IP network 30 and a mobile phone network 40 including a plurality of base stations 41A, 41B,. Connected to the IP network 30 are a monitoring system 1 and a SIP (Session Initiation Protocol) server 31 as a session management device. The monitoring system 1 includes an image transmission apparatus 10 including a TV camera 2, a sound collection microphone 3, and a speaker 4, and the image transmission apparatus 10 functions as one server on the IP network 30.

  The mobile phone terminal 5 </ b> A is connected to the monitoring system 1 via the mobile phone network 40 and the IP network 30. As will be described later, the user of the mobile phone terminal 5A requests the image transmission apparatus 10 to transmit monitor information, whereby the video information of the monitoring site captured by the TV camera 2 and the monitoring captured by the sound collection microphone 3 are obtained. You can receive the voice information distribution service of the site. The cellular phone terminal 5A that is in the image distribution service from the image transmission apparatus 10 is in a call state with the image transmission apparatus 10, and when the terminal user speaks, the user's voice is transmitted from the speaker 4 of the image transmission apparatus 10 to the monitoring site. Is output.

  An object of the present invention is to enable the mobile phone terminal 5A to communicate with another terminal, for example, the mobile phone terminal 5B, while maintaining the image information distribution service to the mobile phone terminal 5A. The purpose is to allow the user to talk with the user of the mobile phone terminal 5B while watching the video of the monitoring site.

  FIG. 2 shows an example of a display screen output to the mobile phone terminal 5 </ b> A connected to the monitoring system 1. Reference numeral 50 denotes a liquid crystal display unit, and 60 denotes an operation unit 60 having numeric input keys and other operation buttons.

  When the mobile phone terminal 5 </ b> A is connected to the monitoring system 1, an HTML (Hyper Text Markup Language) Web page including a monitor image display area 51 and a command menu area 52 is output to the display unit 50. In the initial screen displayed immediately after connection between the mobile phone terminal 5A and the monitoring system 1, a guidance text for requesting the user to select a request command displayed in the command menu is displayed in the display area 51 of the monitor image. In the example shown here, the command menu area 52 has a monitor information request 521 for requesting transmission of monitor information (monitoring site image and sound) as a request command selectable by the user, and a contact information registered in advance. A call request 523 requesting connection with the user and a call end request 523 requesting end of the call are prepared.

  When the user operates the input key of the operation unit 60 to select the monitor information request 521, a monitor information transmission request is issued from the mobile phone terminal 5A to the image transmission apparatus 10, and the image transmission apparatus 10 Start distribution service. As a result, the video of the monitoring site captured by the camera 2 is output to the image display area 51, and the sound of the monitoring site captured by the sound collection microphone 3 is output to the handset of the mobile phone terminal 5A. When the user selects the call request 523 while watching the video of the monitoring site, a call request is issued from the mobile phone terminal 5A to the image transmission apparatus 10.

  The feature of the present invention is that the image transmission apparatus 10 that has received a call request from the mobile phone terminal 5A during the monitor information distribution service registers in advance as a contact address while continuing the image distribution service to the mobile phone terminal 5A. A call connection is established with a certain mobile phone terminal 5B, the voice packet received from the mobile phone terminal 5A is transferred to the mobile phone terminal 5B, and the voice packet received from the mobile phone terminal 5B is transferred to the mobile phone terminal 5A. The voice relay service is executed.

FIG. 3 is a block diagram showing an embodiment of the main part of the image transmission apparatus 10.
The image transmission apparatus 10 includes an A / D conversion unit 11 that converts an analog image signal output from the camera 2 into a digital signal, and a compression encoding of the image signal output from the A / D conversion unit 11, for example. The MPEG image encoding unit 12, the image data buffer 13 for temporarily storing the compression encoded image data output from the image encoding unit 12, and the audio signal output from the sound collecting microphone 3 as a digital signal A / D converter 14 for converting to A / D, and an audio signal output from A / D converter 14, for example, an ADPCM audio encoder 15 and an audio encoder 15 for compression encoding A transmission audio data buffer 16 for temporarily storing the compressed audio data.

  The compressed and encoded image data stored in the image data buffer 13 is read by the image distribution control unit 20, converted into an image packet having the mobile phone terminal 5A as a destination address, and then input to the transmission control unit 23. It is sent to the IP network 30 via the interface 24. The image data transmitted in each image packet is linked to the image display area 51 of the Web page output to the mobile phone terminal 5A.

  On the other hand, the compressed and encoded audio data stored in the transmission audio data buffer 16 is input to the audio distribution control unit 21 via the switch 22 and converted into an audio packet having the mobile phone terminal 5A as the destination address for transmission control. Input to the unit 23. The voice packet is sent from the transmission control unit 23 to the IP network 30 via the line interface 24 in the same manner as the image packet.

  The voice distribution control unit 21 is a main control unit of the monitoring system 1 that governs the operation mode of the image transmission apparatus 10, and includes a VoIP IP telephone control function (program module) 211 and a voice IP packet header conversion function (program). Module) 212 and a contact information memory 213.

  A packet received by the line interface 24 from the IP network 30 is input to the reception control unit 25. The reception control unit 25 identifies the received packet and distributes the control packet including the control message to the voice distribution control unit 21. When the received packet is an audio packet, the reception control unit 25 extracts the compressed encoded audio data from the payload of the received packet and outputs this to the received audio data buffer 17 while the image monitoring apparatus 10 is operating in the full monitoring mode. To do. When the image monitoring apparatus 10 is operating in the voice relay mode, the reception control unit 25 outputs the voice packet received from the line interface 24 to the relay packet buffer 26 as it is.

  When the image monitoring apparatus 10 is operating in the full monitoring mode, the compressed encoded audio data stored in the received audio data buffer 17 is input to the audio decoding unit 18 via the switch 22 and decoded by the audio decoding unit 18. The converted digital audio data is converted into an analog signal by the audio D / A converter 19 and output to the speaker 4.

  When the mobile phone terminal 5A shown in FIG. 1 issues a monitor information transmission request to the monitoring system 1, the audio distribution control unit 21 connects the transmission audio data buffer 16 to the audio distribution control unit 21, and receives the audio data buffer. The state of the switch 22 is controlled so that 17 is connected to the speech decoding unit 18. At this time, the operation mode of the image transmission apparatus 10 is a full monitoring mode in which the video of the camera 2 is distributed to the mobile phone terminal 5A in a state where the sound collection microphone 3 and the speaker 4 are connected to the mobile phone terminal 5A.

  When the mobile phone terminal 5A issues a call request while the image transmission apparatus 10 is operating in the full monitoring mode, the voice distribution control unit 21 outputs the voice packet received from the line interface 24 to the relay packet buffer 26. In this manner, the reception control unit 25 is instructed to switch the operation mode, the state of the switch 22 is switched, the connection between the audio decoding unit 18 and the reception audio data buffer 17 is disconnected, and the relay packet buffer 26 performs audio distribution. Connected to the control unit 21.

  At this time, the voice delivery control unit 21 executes a communication control procedure for making a call connection with the mobile phone terminal 5B whose address is registered in advance as a contact by the IP phone control function 211. When the call connection with the cellular phone terminal 5B is completed, the operation mode of the voice distribution control unit 21 reads the voice packet from the relay packet buffer 26 and outputs the voice packet whose header is converted by the packet header conversion function 212 to the transmission control unit 23. Switch to voice relay mode.

  While the voice distribution control unit 21 is operating in the voice relay mode, the voice packet transmitted from the mobile phone terminal 5A and the voice packet transmitted from the mobile phone terminal 5B arrive at the monitoring system 1 in a mixed manner. Packets are sequentially stored in the relay packet buffer 26 via the reception control unit 25.

  The packet header conversion function 212 reads the voice packets stored in the relay packet buffer 26 one after another, determines the source address indicated by the packet header, and the transmission packet from the mobile phone terminal 5A sets the destination address as the mobile phone terminal. The transmission packet from the mobile phone terminal 5B is converted to the address of 5B, and the destination address is converted to the address of the mobile phone terminal 5A and transferred to the transmission control unit 23. Since the output of the image packet from the image distribution control unit 20 to the transmission control unit 23 continues even while the audio distribution control unit 21 is operating in the voice relay mode, the user of the mobile phone terminal 5A monitors the video on the monitoring site. It is possible.

  The telephone number of the mobile phone terminal 5B, which is the contact address of the mobile phone terminal 5A, is registered in advance in the contact information memory 213 provided in the voice distribution control unit 21. In response to a call request from the mobile phone terminal 5A, the IP phone function unit 211 reads a contact telephone number from the contact information memory 213 and establishes a call connection with the mobile phone terminal 5B. However, the mobile phone terminal 5B as a contact may be specified in the call request message from the mobile phone terminal 5A.

Hereinafter, an embodiment of a communication sequence between the mobile phone terminal 5A and the monitoring system 1 will be specifically described.
The mobile phone terminal 5A can receive an initial screen (Web page) including a command menu by connecting to the image transmission apparatus 10 using, for example, HTTP (Hyper Text Transfer Protocol) which is a general server access method in an IP network. . In the embodiment of the present invention, when the user selects the monitor information request 521 from the command menu, the cellular phone terminal 5A is connected via the SIP server 31 with the protocol SIP specified by IETF (Internet Engineering Task Force) RFC3261. (Session Initiation Protocol) establishes a connection for communicating image data and audio data with the image transmission apparatus 10. When the user selects the call request 522 in the command menu, the call request is notified to the image transmission apparatus 10 by a SIP message, and the image transmission apparatus 10 communicates with the mobile phone terminal 5B via the SIP server 31. Set up a call connection.

  The SIP message is included in a payload 80 of an IP packet having a TCP / UDP header 81 and an IP header 82 as shown in FIG. As shown in FIG. 5, the format of the SIP message 80 includes a start line 801 indicating a message type (Request-Method) and a destination address (URI), a header portion 802 describing the content of a request or a response, and connection definition information. The message body portion 803 describes (c; connection, m; media, a; attribute).

  Examples of SIP message types described in the start line 801 include “INVITE” indicating a connection request message for connection, “BYE” indicating a connection disconnection request message, and “200 OK” indicating a connection (or disconnection) response message. “ACK” indicating a connection confirmation message and “INFO” indicating a special information notification message.

  In the header section 802, for example, a Via header indicating the route of the SIP message, a To header indicating the destination of the message and a From header indicating the transmission source, a Call-ID indicating a connection identifier specified by the transmission source, and a SIP server are registered. A Contact header indicating the URI of the client terminal to be connected, a Content-Type header and a Content-Length header defining the subsequent message body 803, and the like are included.

  When the user selects the monitor information request 521, the message body portion 803 of the connection request (INVITE) message transmitted from the mobile phone terminal 5A to the SIP server 31 includes, for example, a mobile phone as connection definition information for image data communication. The IP address of the terminal 5A, the port number for image reception, and the attribute indicating the communication direction (reception) of the image are described. As the connection definition information for voice data communication, the IP address of the mobile phone terminal 5A, the port for voice reception An attribute indicating a number and a voice communication direction (bidirectional) is described.

FIG. 6 shows a communication sequence diagram executed among the mobile phone terminal 5A, the SIP server 31, the image transmission apparatus 10, and the mobile phone terminal 5B.
The cellular phone terminal 5A connects to the image transmission device 10 by an HTTP connection procedure designating the URI (Uniform Resource identifier) of the image transmission device 10 (SQ0), and receives an initial screen including a command menu from the image transmission device 10. (SQ1).

  When the user selects the monitor information request 521 in the command menu (101), the cellular phone terminal 5A transmits a connection request (INVITE) message M1 including the above-mentioned session definition information in the message body part to the SIP server 31. After performing the user authentication process, the SIP server 31 adds a Via header to the connection request message M1 and transfers it to the image transmission apparatus 10 as a connection request message M1 '.

  When the image transmission apparatus 10 returns the connection response (200 OK) message M2, the SIP server 31 rewrites the Via header of the received message M2 and transmits it to the mobile phone terminal 5A as the connection response message M2 '. The mobile phone terminal 5A that has received the connection response message M2 'transmits a connection confirmation (ACK) message M3 to the SIP server 31. When the SIP server 31 adds a Via header to the connection confirmation message M3 and transfers it to the image transmission apparatus 10 as the connection confirmation message M3 ′, transmission of an image packet is performed between the image transmission apparatus 10 and the mobile phone terminal 5A. And a connection for sending and receiving voice packets is set up.

  In the image transmission apparatus 10, the connection setting procedure described above is performed by the audio distribution control unit 21. When the connection setting by SIP with the mobile phone terminal 5A is completed, the audio distribution control unit 23 follows the image data connection definition information specified by the connection request message M1 ′ to the image distribution control unit 20. In addition to instructing the transmission of the image packet, it itself starts the operation of transmitting the audio packet in accordance with the audio data connection definition information specified by the connection request message M1 ′. As a result, image data transmission D (P) and audio data D (VM) are repeated from the image transmission apparatus 10 to the cellular phone terminal 5A at a predetermined cycle.

  When the user selects the call request 522 in the command menu (102), the mobile phone terminal 5A transmits a call request notification (INFO) message M10 indicating a call request in the message body part to the SIP server 31. The call request notification message M10 has a Via header added by the SIP server 31, and is transferred to the image transmission apparatus 10 as a call request notification message M10 '. When the voice distribution control unit 21 of the image transmission apparatus 10 receives the call request notification message M10 ′, the switch 20 switches the state of the switch 20 to the voice relay mode (103), and the IP telephone function 231 stores the information in advance in the contact information memory 213. A procedure for setting a call session with the registered mobile phone terminal 5B is executed.

  When the user selects a call request 522 in the command menu (102), the mobile phone terminal 5A sends a call request notification (INFO) message M10 including a call request and call destination information in the message body part to the SIP server 31. You may make it transmit. In this case, the audio distribution control unit 21 of the image transmission apparatus 10 can set a call session with the mobile phone terminal 5B according to the call destination information indicated by the body part of the received call request notification message M10 '. Call destination information set in the body part of the call request notification message M10 may be address information (telephone number) of a terminal serving as a contact, or a plurality of telephone terminals registered in the contact information memory 213 in advance. Information for specifying one of the address information (telephone number) may be used.

  In a call session with the mobile phone terminal 5B, the voice distribution control unit 21 (IP phone function 211) designates the telephone number (URI) of the mobile phone terminal 5B to the SIP server 31 via the transmission control unit 23. It is set by transmitting a connection request (INVITE) message M11 and returning a connection confirmation (ACK) message M13 in response to reception of a connection response (200 OK) message M12 from the mobile phone terminal 5B.

  When the setting of the call session with the mobile phone terminal 5B is completed, the voice distribution control unit 21 operates in the voice relay mode. In this case, when the packet read from the relay packet buffer 26 is the voice packet D (VB) from the mobile phone terminal 5B, the voice delivery control unit 21 rewrites the destination address with the IP address of the mobile phone terminal 5A, and transmits the source address. Is rewritten to the IP address of the image transmission apparatus (104), and transferred to the transmission control unit 23 as a voice packet D (VB) ′. The voice packet D (VA) from the mobile phone terminal 5A is rewritten to the IP address of the mobile phone terminal 5B (104), and the source address is rewritten to the IP address of the image transmission device, and the voice packet D (VA) is sent. 'Is transferred to the transmission control unit 23. As a result, a call can be made between the terminals 5A and 5B.

  When the call between the mobile phone terminals 5A and 5B ends and a disconnect request (BYE) message is issued from the mobile phone terminal 5B side, the audio distribution control unit 21 returns a disconnect response (200 OK) message, The call session between the transmission device 10 and the mobile phone terminal 5B is disconnected, and the voice distribution control unit 21 is restored to the full monitoring mode.

  On the other hand, when ending the call with the mobile phone terminal 5B from the mobile phone terminal 5A side, the user selects the call end request 523 from the command menu (105). In this case, the mobile phone terminal 5 </ b> A transmits a call end notification (INFO) message M <b> 20 indicating the end of the call in the message body part to the SIP server 31. The call end notification message M20 has a Via header added by the SIP server 31, and is transferred to the image transmission apparatus 10 as a call end notification message M20 '.

  When receiving the call end notification message M20 ′, the voice distribution control unit 21 of the image transmission apparatus 10 transmits a disconnection request (BYE) message M21 and receives a disconnection response (200 OK) message M22 from the mobile phone terminal 5B. Then, the state of the switch 22 is switched, and the operation mode of the image transmission apparatus 10 is restored to the full monitoring mode in which both the image packet D (P) and the voice packet D (VM) are transmitted to the mobile phone terminal 5A (106). .

  When the user of the mobile phone terminal 5A disconnects communication with the image transmission apparatus 10 in order to end the reception of monitor information (107), a disconnect request (BYE) message M30 is issued, and a Via header is added by the SIP server 31. Then, it is transferred to the image transmission apparatus 10 as a disconnection request message M30 ′. The audio distribution control unit 21 of the image transmission apparatus 10 returns a disconnection response (200 OK) message M31, and the SIP server 31 rewrites the Via header and transfers this to the mobile phone terminal 5A as the disconnection response message M31 ′. The session between the image transmission device 10 and the mobile phone terminal 5A is disconnected.

  In the above embodiment, when the user of the mobile phone terminal 5A selects the call request 522 in the command menu, the voice distribution control unit 21 of the image transmission apparatus 10 carries the mobile phone according to the IP phone number of the contact registered in advance. Although a call session (call connection) is set with the telephone terminal 5B, a plurality of telephone numbers are registered in the contact information memory 213 in order of priority, and the contact terminal selected first is within a predetermined time. If the call is not answered, the next registered contact may be called.

  In addition, instead of the call request 522, for example, a plurality of contacts such as “Head of security” and “Head of fire” are prepared in the command menu, and the terminal user contacts according to the situation of the monitoring site. The destination may be selectable. In this case, a telephone number is stored in the contact information memory 213 in correspondence with the contact identifier prepared in the command menu, and the voice distribution control unit 21 receives the notification notified by the call request notification message M10. A call may be made to the mobile phone terminal corresponding to the destination identifier.

  The contact address information may be linked to the command menu, and the contact address information specified by the user operation may be transmitted to the image transmission apparatus side by the call request notification message M10. In this case, the image transmission apparatus can establish a call session with the contact terminal based on the address information specified by the call request notification message M10 without referring to the contact information memory 213. Become.

  In the above embodiment, the terminal called by the call request from the mobile phone terminal 5A is the mobile phone terminal 5B, but the contact terminal may be a fixed telephone. In the communication sequence described with reference to FIG. 6, the connection for image data and the sound data is connected between the mobile phone terminal 5 </ b> A and the image transmission device 10 by the connection request message M <b> 1 issued in response to the monitor information request 101. However, first, only the connection for image data is formed, and the connection for audio data is formed at a different opportunity from the connection for image data, for example, in response to the call request 102. It may be. In the embodiment, the case where SIP is applied for setting a call connection has been described. However, a control protocol other than SIP, for example, RTSP (Real Time Streaming Protocol) may be applied to the present invention.

The figure which shows an example of the communication network to which the image transmission apparatus of this invention is applied. The figure which shows an example of the display screen of a mobile telephone terminal. FIG. 2 is a block diagram illustrating a configuration of a main part of the image transmission apparatus. The format figure of the IP packet containing a SIP message. The format figure of a SIP message. The figure which shows the communication sequence which shows one Example of this invention.

Explanation of symbols

1: surveillance system, 2: camera, 3: sound collection microphone, 4: speaker, 5: mobile phone terminal, 10: image transmission device, 30: IP network, 31: SIP server, 40: mobile phone network, 41: base 11: Image A / D, 12: Image encoding unit, 13: Image data buffer, 14: Audio A / D, 15: Audio encoding unit, 16: Transmission audio data buffer, 17: Reception audio data buffer, 18: Audio decoding unit, 19: Audio D / A, 20: Image distribution control unit, 21: Audio distribution control unit, 22: Switch, 23: Transmission control unit, 24: Line interface, 25: Reception control unit, 26 : Relay packet buffer.

Claims (2)

An image transmission apparatus that is connected to a mobile phone terminal via an IP network and delivers an image taken by a camera to the mobile phone terminal,
A memory for storing address information of a contact telephone terminal registered in advance;
In response to a call request to the contact from the mobile phone terminal, a call connection is established with the contact phone terminal having the address information indicated by the memory while maintaining the image distribution service to the mobile phone terminal. Means for setting
Voice packet relay means for relaying voice packets received from the mobile phone terminal to the contact telephone terminal and for relaying voice packets received from the contact telephone terminal to the mobile phone terminal Image transmission device. An image transmission apparatus that is connected to a mobile phone terminal via an IP network and delivers an image taken by a camera to the mobile phone terminal,
When a call request message to the contact is received from the mobile phone terminal, with the contact address information indicated by the call request message in the state where the image distribution service to the mobile phone terminal is maintained, Means for setting up a phone call connection;
Voice packet relay means for relaying voice packets received from the mobile phone terminal to the contact telephone terminal and for relaying voice packets received from the contact telephone terminal to the mobile phone terminal Image transmission device.

Images