JP2005159588A - Communication apparatus, its control method, and control program of communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform voice communication or image communication continuously through an extremely simple operation without performing useless call connection in a communication apparatus performing voice communication or image communication through an IP network and its control method and control program. <P>SOLUTION: In the first session telephone conversation or image communication, an image communication apparatus 105 acquires the IP address of a telephone conversation partner device from an SIP proxy 104 and in the second session image communication or telephone conversation being started subsequently by a predetermined user operation, connection is made with the telephone conversation partner device using the IP address thereof acquired through first communication session without using the SIP service. If the partner's IP address acquired through first communication session cannot be used, the user is forced to manually input the connection information of a partner performing image communication or telephone conversation in the second communication session. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication apparatus that performs voice communication and image communication via an IP network, a control method thereof, and a control program thereof.

  In recent years, the spread of broadband lines such as ADSL and FTTH has been remarkable. IP telephone services for transmitting voice in IP packets by utilizing the high-speed transmission capability of the broadband line are also rapidly spreading.

  In an IP phone, voice voice data is transmitted and received between terminals having IP addresses on the TCP (or UDP) / IP layer by using VoIP (Voice over IP: for example, ITU-T recommendation H.323: Non-patent document 1 below) This is done according to the protocol. Therefore, although conversion processing from a telephone number to an IP address is necessary, at present, SIP (Session Initiate Protocol: RFC2543: Non-Patent Document 2 below) is a leading standard for conversion from a telephone number to an IP address. ing.

  In IP telephone communication using SIP, when a telephone number is input at a connected terminal, a session request message including a destination telephone number is transmitted to a SIP proxy server (hereinafter referred to as a SIP proxy). The SIP proxy that has received the session request message inquires of the ENUM server to obtain a URI corresponding to the telephone number (E.164 (ITU-T recommendation) number to URI conversion: RFC916: Non-patent document 3 below). Subsequently, the SIP proxy obtains an IP address corresponding to the URI from a DNS (Domain Name System: RFC 1035: Non-Patent Document 4 below) server, and after the SIP proxy acts as a proxy for the initial connection between the call terminals, The call terminal recognizes the other party's IP address, and thereafter, voice packets transmitted from the terminal are transmitted and received between the IP addresses.

On the other hand, in order to perform image communication on the IP network, ITU-T recommendation T.264 is used. 37 and T.W. In addition to using the so-called Internet facsimile procedure described in No. 38, a higher-speed method, for example, sending image data by a protocol such as SMTP, FTP, HTTP, RCP, IPPFAX, etc., displays or prints on the other side. be able to.
ITU-T recommendation 323 RFC2543: http://www.faqs.org/rfcs/rfc2543.html RFC916: http://www.faqs.org/rfcs/rfc916.html RFC1035: http://www.faqs.org/rfcs/rfc1035.html

  Conventionally, when performing voice communication and image communication over an IP network, it is necessary to use separate hardware, and the operation is complicated.

  For example, it is impossible to send an image to the same party during a call with the same hardware. For example, to make a call, enter the phone number at the IP phone terminal and connect to the other party. The IP address or the printer-URI is heard, and the IP address or the like must be input again to an image communication apparatus different from the IP telephone terminal such as a personal computer, which requires a complicated operation and tends to cause an erroneous operation.

  On the other hand, if the SIP proxy is used as described above, the IP address of the partner terminal can be recognized, and the source terminal does not pass through the server, and peer-to-peer other than voice data such as image data is sent to the destination terminal. However, conventionally, the IP address obtained from the SIP proxy is used only at the time of call connection. Eventually, for image communication, some other device as described above (and its operation) Was necessary.

  In view of the above problems, an object of the present invention is to provide a communication device that performs voice communication and image communication via an IP network, a control method thereof, and a control program thereof, without making useless call connection and extremely simple. It is to be able to perform voice communication or image communication continuously with a simple operation.

  In order to solve the above-mentioned problems, the present invention has a voice input / output means for voice communication and an image input means for inputting an image to be transmitted, and performs voice communication and image communication via an IP network. In the apparatus, its control method, and its control program, the IP address of the partner communication apparatus is acquired by using the SIP service in the first communication session after the call, voice communication or image communication is performed, and then the second In this communication session, an image communication or voice communication is performed by connecting to the partner communication device using the IP address of the partner communication device acquired in the first communication session without using the SIP service.

  By adopting the above characteristic configuration, the IP address of the partner communication device acquired in the first communication session is used in the second communication session without using the SIP service. It is possible to obtain an excellent effect that voice communication or image communication can be continuously performed without performing connection processing and with an extremely simple operation.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. The present invention is applicable to an IP telephone or a communication apparatus compatible with IP communication. Hereinafter, an embodiment relating to an image communication apparatus capable of making a telephone call using an IP telephone, its control method, and its control program will be described. .

  FIG. 1 shows the configuration of a network system to which this embodiment can be applied. In the figure, reference numeral 101 denotes an Internet network (IP network). Reference numeral 102 denotes an ENUM server that performs processing for converting a telephone number into a URI or a domain name. Reference numeral 103 denotes a DNS (Domain Name System) server that performs processing for converting a domain name into an IP address.

  Reference numeral 104 denotes a SIP proxy for VoIP (global IP address: 193.1168.0.1), which provides a SIP (Session Initiation Protocol) service for performing a call connection process in an IP telephone service.

  Reference numeral 105 denotes a first image communication apparatus (global IP address: 194.168.0.1), which functions as a device on the call and image transmission side in this embodiment.

  Reference numeral 106 denotes an ADSL modem, which has an analog telephone interface for connecting an analog telephone and a CSMA / CD (for example, Ethernet (trade name)) interface for transmitting and receiving digital data. The ADSL modem 106 multiplexes and modulates the voice band signal of the analog telephone interface (not shown) and the voice band signal of the CSMA / CD interface 107 and transmits to the communication line, and conversely, the signal received from the communication line. It has a function of separating a voice band signal and a voice band signal and outputting them to an analog telephone interface and a CSMA / CD interface 107, respectively.

  Reference numeral 107 denotes a CSMA / CD interface for connecting the ADSL modem and the image communication apparatus, 108 denotes a second image communication apparatus (global IP address: 197.168.0.1), and 109 denotes the same configuration as the ADSL modem 106. The ADSL modem 110 is a CSMA / CD interface configured similarly to the CSMA / CD interface 107.

  FIG. 2A shows the configuration of the image communication apparatus 105 (or an image communication apparatus 108 described later). In the figure, reference numeral 201 denotes a CPU, which controls the image communication apparatus according to a program stored in the ROM 202. The CPU 201 also performs TCP / IP protocol processing, and the assembly of image data into a TCP / IP frame is performed under the control of the CPU 201. Reference numeral 203 denotes a RAM which is used as a work memory when executing a program and also used for buffering image data to be transmitted and received.

  Reference numeral 204 denotes a contact image sensor (CIS) that converts an image of a document into an analog signal. The reading control unit 205 converts an analog signal output from the CIS 204 into digital data. The converted digital data is transferred to the RAM 203 under the control of the CPU 201 and transmitted (or recorded output, etc.) as described later.

  Reference numeral 206 denotes an MH encoding / decoding processing unit, which compresses the read image data by MH encoding at the time of image transmission. At the time of reception, the MH-encoded image data is decoded.

  Reference numeral 207 denotes a FAX modem, which modulates MH encoded data at the time of transmission and converts it into an analog signal in a voice band that can be transmitted through an analog line. At the time of reception, the received analog signal is demodulated and MH encoded data is output.

  Reference numeral 208 denotes a voice input / output unit (handset), which includes a microphone for inputting voice and a speaker for outputting voice.

  Reference numeral 209 denotes an analog switch that switches a signal connected to the CODEC 210. The CODEC 210 and the FAX modem 207 are connected during facsimile image communication, and the CODEC 210 and the voice input / output unit 208 are connected during a call.

  Reference numeral 211 denotes a key operation unit, which includes a dial, a facsimile transmission / reception operation button, and the like, and constitutes a user interface unit together with the liquid crystal display unit 212.

  Reference numeral 213 denotes a recording processing unit configured by an arbitrary recording method such as an electrophotographic method or an inkjet method. The recording processing unit 213 converts the received (or input by other method) image data into print raster data and prints it out.

  Reference numeral 214 denotes a card interface to which a memory card storing JPEG images taken with a digital camera can be connected.

  Reference numeral 215 denotes a JPEG processing unit which JPEG compresses a JPEG image input via the card interface. Also, the received JPEG image data is decompressed.

  Reference numeral 216 denotes a LAN controller which performs data transmission / reception with the ADSL modem 106 (109) via the CSMA / CD interface 107 (110). When the data to be transmitted is transferred to the LAN controller 216, it is transmitted to the CSMA / CD interface 107 after adding a MAC (Media Access Control) frame header and FCS (Frame Check Sequence).

  FIG. 2B shows an external configuration of the image communication apparatus 105 (108) of FIG. In the figure, reference numeral 101 denotes an Internet network (IP network) to which the image communication apparatus 105 (108) is connected. In the present embodiment, the IP network 101 and the image communication apparatus 105 (108) are connected by wired line connection, that is, ADSL (however, in addition to ADSL, any wired (including optical fiber) / wireless LAN system, Any connection method such as the CATV method is conceivable). In the case of ADSL, an ADSL modem 106 (109) is used as a termination device. The ADSL modem 106 (109) has an analog telephone line connection on the IP network 101 side and a LAN connection on the image communication device 105 (108) side.

  The operation unit 211 (corresponding to the operation unit 211 in FIG. 2A) of the image communication apparatus 105 (108) is provided with an image communication key 211a. It functions in the same way as the “Send” button and the like, and image communication (for example, transmission of an image read by the CIS 204, a JPEG image input from the card interface 214, etc.) can be started by pressing the image communication key 211a.

  Furthermore, the operation unit 211 is provided with a call key 211b. The call key 211b first performs image communication in the first session and then starts a call in the second session in Example 2 described later. Used in cases.

  Next, communication control in the above configuration will be described. Hereinafter, processing when the first image communication apparatus 105 makes a call to the second image communication apparatus 108 to make a call and further performs image transmission during the call will be described.

  4A to 4C are communication control procedures executed by the image communication apparatus 105, FIG. 5 is a communication control procedure executed by the image communication apparatus 108, and FIG. 6 is a communication control procedure executed by the SIP proxy 104. Yes. 4A to 4C, flows with the same alphabet are assumed to be continuous at that position. These communication procedures may be stored in the ROM 202 as a control program for the CPU 201.

  FIGS. 3A to 3C show communication sequences realized by the communication control of FIGS. 4 to 6, and step numbers corresponding to the processes of FIGS. 4 to 6 are given.

  FIG. 3A shows a communication sequence when the image communication device 105 makes a connection for the first call to the image communication device 108. FIGS. 3B and 3C show image communication from the image communication device 105. This is a communication sequence when image transmission is performed to the device 108 without performing call connection again during a call.

  In particular, in FIG. 3B and FIG. 3C, FIG. 3B extends the second session from the IP address obtained in the call, and the received Printer-URI is stored in the Printer-URI stored in the memory. On the other hand, FIG. 3C is a communication sequence diagram when manually inputting the Printer-URI again when the received Printer-URI does not match the Printer-URI stored in the memory. is there.

  Hereinafter, processing when the first image communication apparatus 105 starts image communication with the other party during a call to the second image communication apparatus 108 will be described.

  When the image transmission key is pressed following the input of the destination telephone number by the key operation unit 211 of the image communication apparatus (FIG. 4A, step S401), the IP address corresponding to this telephone number is stored in the memory. It is checked whether or not (step S402). If the other party has already sent an image, an IP address corresponding to the telephone number is stored in a predetermined area of the memory (RAM 203) as described later.

  If the IP address corresponding to the telephone number is stored in the memory in step S402, the process jumps to step S440. If the IP address is not stored in the memory, the SIP service is used in steps S404 to S406. Get the IP address of the other station.

  In step S404, a process of transmitting a SIP session request message (INVITE message) containing the telephone number information via the CSMA / CD interface 107 connected to the ADSL modem 106 in accordance with the telephone number input in the memory. This is performed (step S404). This SIP message is configured in the following text format.

INVITE sip: ezumi@canon.co.jp SIP / 2.0
Via: SIP / 2.0 / UDP soho.canon.co.jp
From: yosuke ezumi <ippfax: //ezumi.canon.co.jp>
To: <tel: 050-1234-5678>
Call-ID: 2ef-1737483932@soho.canon.co.jp
Cseq: 1 INVITE
Content Type: application / SDP
v = 0
o = mhandley 2890844526 2890842807 IN IP4 126.16.64.4
s = Image
t = 2873397496 2873404696
m = ippfax 44000 TCP
As described above, in the text following the header describing destination information based on the input telephone number, various parameters are described based on SDP (Session Description Protocol: RFC2327). In the case of image communication, the media type is an image (“s = Image” above) and a description about the type of image transmission protocol to be used can be described. In addition, the TCP port number used when transmitting / receiving the image packet can be described. In the above example, it is specified that IPPFAX is used as the transmission / reception protocol of the image packet, and that the 44000 port of TCP is used (described above). Part of "m = ippfax 44000 TCP").

  When transmitting this SIP message, UDP is used as a transport layer. For this reason, the CPU 201 adds a UDP header to the SIP message, generates a UDP frame, and stores it in the memory 203. The IP address 193.168.0.1 of the SIP proxy 104 is entered in the destination address in the UDP header, and 194.168.0.1 which is the IP address of the image communication apparatus 105 is entered in the source address. . Also, 5060, which is a SIP well-known port number, is entered as the destination port number, and an arbitrary port number (5000 in this example) is entered as the source port number.

  The CPU 201 transfers the UDP frame generated in this way to the LAN controller 216. When receiving the transmission data, the LAN controller 216 adds a MAC (Media Access Control) header and transmits the data to the ADSL modem 106, and the ADSL modem 106 that has received the data transmits the received data to the IP network 101. Various messages transmitted thereafter are also transmitted in the same procedure.

  In the case of this packet, since the IP address of the SIP proxy 104 is entered as the destination IP address, it is delivered to the SIP proxy 104 via the IP network 101 (step S601 in FIG. 6).

  The SIP proxy 104 expands the telephone number in the header of the received session request message into an address format such as “8.7.6.5.5.4.2.1.e164.arpa” (step S602). An inquiry is made to the ENUM server 102 (step S603). Upon receiving the inquiry, the ENUM server 102 searches for the URI corresponding to “8.7.6.5.5.4.2.1.e164.arpa”, for example, “ippfax: // canon. A URI such as “co.jp/abc” is returned to the SIP proxy 104.

  The SIP proxy 104 that has received the URI (step S604) inquires of the DNS server 103 about the IP address corresponding to the received URI “ipfax: //canon.co.jp/abc” (step S605). Upon receiving the inquiry, the DNS server 103 returns an IP address 197.168.0.1 corresponding to the image communication apparatus 108 corresponding to this URI to the SIP proxy 104.

  The SIP proxy 104 that has received the IP address of the partner image communication apparatus 108 from the DNS server (step S606), the image communication apparatus 108 that has received the transmission destination IP address in the packet received from the image communication apparatus 105 from the DNS server 103. And the source IP address is replaced with the IP address of the SIP proxy 104, and then a session request message is transmitted to the image communication apparatus 108 (step S607).

  On the other hand, the image communication apparatus 108 that has received the session request message (step S501 in FIG. 5) transmits a calling message to the SIP proxy 104 (step S502). The destination telephone number information described in the header of the received session request message is entered in the destination of the in-call message header, and the destination IP address is the source IP address of the session request message. Send the proxy 104 address. At this time, the SIP message (calling message) transmitted by the image communication apparatus 108 describes various parameters in the above SDP format as well as the session request message transmitted by the image communication apparatus 105, and is received by the image communication apparatus 108. The TCP port number for the image packet to be performed can also be specified. In this embodiment, the port number used by the image communication apparatus 108 for receiving image packets is 47000.

  In addition, the image communication apparatus 108 transmits a ringing message and rings a ringing tone, and at the same time displays that there is an incoming call for a call (step S503).

  The SIP proxy 104 that has received the in-call message (step S608) replaces the IP address of the image communication apparatus 105 with the destination IP address of the in-call message and replaces the IP address of the SIP proxy 104 with the IP address of the SIP proxy 104 for transmission. (Step S609), the image communication apparatus 105 receives the calling message (Step S405 in FIG. 4).

  Thereafter, the response message is transmitted via the SIP proxy 104 via the SIP proxy 104 by an appropriate key operation of the operation unit 211 of the image communication apparatus 108 (the call key 211a may be used in the configuration of FIG. 2B) or an off-hook of the handset. It is transmitted to the apparatus 105 (FIG. 4, step S406, FIG. 5, step S521). At this time, the SIP proxy 104 that has received the response message (step S610) converts only the destination IP address into the IP address of the image communication apparatus 105 and transfers the response message (step S611), and the image communication apparatus 105 responds. A message is received (step S406).

  When receiving the response message, the image communication apparatus 105 determines whether or not the current session is the second or later communication session after the call is made. In the present embodiment, a call is made in the first communication session, and then image communication is performed in the second and subsequent communication sessions. In the case of the second and subsequent communication sessions after the call, the process proceeds to step S421 (FIG. 4B), and in the case of the first communication session after the call, the process proceeds to step S407.

  The image communication apparatus 105 can recognize the IP address of the image communication apparatus 108 based on the transmission source IP address in the response message received in step S407. Thereafter, the image communication apparatus 105 does not pass through the SIP proxy 104 and directly A packet can be transmitted to 108.

  Further, the image communication apparatus 105 stores the IP address 197.168.0.1 of the image communication apparatus 108 recognized as described above in the memory in association with the telephone number 050-1234-5678 (step S408). The telephone number / IP address correspondence information is searched in the above-described step S402. Therefore, if the party communicated in the past, a branch to the above-described steps S402 to S440 occurs, and a SIP session is not performed. High-speed call connection is possible.

  The image communication apparatus 105 transmits a response confirmation message with the destination IP address as the IP address of the image communication apparatus 108, and the call connection procedure is terminated and a call state is established (step S409). Here, the image communication apparatus 105 and the image communication apparatus 108 shift to a call state, and a call is performed.

  The communication sequence of the call connection and the call in the first session performed as described above is as shown in FIG.

  When the user wishes to transmit an image to the other party during the call, an operation for communicating the image is performed while maintaining the state of the call. That is, when image transmission to the other party is selected in image communication apparatus 105, for example, operation of image communication key 211a of operation unit 211 (or other appropriate operation) is performed (step S441), step S421 (FIG. 4 (b)). While image transmission is not selected, a call end operation (for example, by an on-hook operation) is detected in step S442 while looping to step S409, and the call process is continued.

  When image transmission is selected, the image communication apparatus 105 recognizes that the IP address of the destination image communication apparatus 108 is 197.168.0.1 (FIG. 4B, step S421), and the second An IP address 197.168.0.1 is added to the session request message and transmitted (step S422). The session request message has the same format as the SIP message shown above, but the specification of parameters (specification of port number, protocol, etc.) can be changed according to the content of the already exchanged SIP message. Such control makes it possible to realize negotiation in accordance with the communication capability of the other party.

  Thereafter, a calling message, a response message, and a response confirmation message are transmitted and received between the image communication apparatus 105 and the image communication apparatus 108, and it is determined whether or not the call connection message can be normally transmitted and received (step S423). ). If the call connection message cannot be normally transmitted / received, the process proceeds to step S444 described later.

  If the call connection message can be normally transmitted / received, an image transmission / reception procedure based on the IPPFAX protocol is started after step S424. First, the image communication apparatus 105 transmits a Get-Printer-Attributes message (step S424). For details of the Get-Printer-Attributes message, refer to step S410 and later.

  In response to this Get-Printer-Attributes message, when a Get-Printer-Attributes Response message is received from the image communication apparatus 108 (step S425), the Printer- of the image communication apparatus 108 described in the Printer-URI in the message is displayed. The URI is read (step S426). Then, the read Printer-URI is compared with the Printer-URI corresponding to the dialed telephone number stored in the memory (step S427).

  As a result of the comparison, if the received Printer-URI matches the Printer-URI stored in the memory, the image communication apparatus 108 in communication is recognized as the target communication partner (step S428), and the step The process proceeds to the image transmission control after S410 (FIG. 4C).

  If the received Printer-URI does not match the Printer-URI stored in the memory, and if the Get-Printer-Attributes Response message cannot be received from the image communication apparatus 108 in step S425 described above, The process of step S444 is performed. Step S444 will be described later.

  FIG. 3B shows a sequence of image communication in the second session started from the call in this way. In this image transmission, since prevention of data errors is more important than real-time characteristics, TCP is used as a transport layer for image communication.

  Here, the image communication apparatus 105 transmits information such as transmission image parameters to the image communication apparatus 108 based on the IPPFAX protocol prior to image transmission. All IPPFAX messages are transmitted using HTTP POST. In addition, the destination port number in the IPPFAX message transmitted by the image communication apparatus 105 is 47100 and the transmission source port number is 44100 due to the message exchange described above, and the destination port number in the IPPFAX message transmitted by the image communication apparatus 108. 44100 and the source port number 47100 are selected.

  In image communication, the image communication apparatus 105 first transmits a Get-Printer-Attributes message (step S410 in FIG. 4C). The purpose of this message is to confirm with the image communication apparatus 108 the apparatus name, the document format that can be processed, and the like. The document format is described in the MIME (Multipurpose Internet Mail Extensions) format.

Details of the format of the Get-Printer-Attributes message are described in RFC 2911, and will not be described in detail here. Confirm whether JPEG image reception / recording is supported as a format. Information for confirming the Printer-URI of the image communication apparatus 108 is included (the same applies to the information transmitted in step S424). This is because when the image is transmitted to the other image communication apparatus without going through the SIP proxy, it is determined by the Printer-URI whether or not the other party is trying to transmit.

  Further, the Get-Printer-Attributes message transmission process is arranged in step S424 (FIG. 4B) and step S410 (FIG. 4C), which is performed by the printer-URI in step S444 described later. This is because there is a possibility of manual input.

  The image communication apparatus 108 that has received the Get-Printer-Attributes message (step S506 in FIG. 5) sends a Get-Printer-Attributes Response message including information indicating that a JPEG image is supported as the document format to the image communication apparatus 105. Transmit (step S507).

  When the image communication apparatus 105 receives the Get-Printer-Attributes Response message (step S411 in FIG. 4C), the image communication apparatus 105 displays the Printer-URI of the image communication apparatus 108 described in the Printer-URI in the message as the image communication. The information is stored in the memory in association with the telephone number of the device 108 (step S412). Further, a Validate-Job message is transmitted to the image communication apparatus 108 in order to confirm whether the image data may be transmitted (step S413).

  When the image communication apparatus 108 receives the Validate-Job message and is ready to receive it (step S508 in FIG. 5), the image communication apparatus 108 transmits the Validate-Job Response message to the image communication apparatus 105 (step S509).

  When the image communication apparatus 105 receives the Validate-Job Response message (step S414 in FIG. 4C), the image communication apparatus 105 transmits a Print-Job message to transmit the JPEG image file. This Print-Job message includes the image file itself together with attribute information such as the URI of the transmission destination apparatus, the document name, and the document format.

  When generating the Print-Job message, the image communication apparatus 105 causes the CPU 201 to read JPEG data stored in the memory card via the card interface 214 (step S415). Subsequently, the CPU 201 performs BASE64 conversion processing on the read data, generates a frame to which each attribute of the Print-Job message and a TCP header including an IP address and a port number are added, and stores the frame in the RAM 203 (step S416). Subsequently, this frame is transferred to the LAN controller 216, and the LAN controller 216 adds the MAC address and transmits it (step S417).

  The image communication apparatus 108 that has received the Print-Job message (step S510 in FIG. 5) can recognize that the received image file is a JPEG image by referring to the attribute information in the MIME header. In the image communication apparatus 108, the LAN controller 216 deletes the header and stores the JPEG data in the RAM 203 (step S511).

  When the image communication apparatus 108 has successfully received the image data, the image communication apparatus 108 transmits a Print-Job Response message indicating that fact to the image communication apparatus 105, thereby ending the image communication operation (step S512). In the image communication apparatus 108 that has received the JPEG image, the JPEG data is decompressed by the JPEG processing unit 215 (step S513), and the recording processing unit 213 converts the decompressed image data into CMKY four-color data (step S514). ) And print out (step S515).

  When receiving the Print-Job Response message (step S418), the image communication apparatus 105 determines that the image has been transmitted normally and ends the image transmission operation (step S419). In this way, the second session is closed.

  If the call connection message cannot be normally transmitted / received in step S423 of FIG. 4B, the Get-Printer-Attributes Response message cannot be received from the image communication apparatus 108 even after a predetermined time has passed in step S425. If the received Printer-URI does not match the Printer-URI stored in the memory in the comparison of the Printer-URI in step S427, the process proceeds to step S444.

  If no response message is received even if an INVITE message is transmitted to the image communication apparatus 108 in step S422 (step S423), the image communication apparatus 108 is connected to the image communication apparatus 108 due to restrictions such as a firewall. If the Get-Printer-Attributes Response message could not be received in Step S425, and the Printer-URI received in Step S427 is the same as the Printer-URI stored in the memory. If not, the other terminal may not have been the desired image communication apparatus 108.

  In step S444, the printer-URI of the partner for whom image transmission is desired is manually input. For the input of the Printer-URI, an appropriate warning message is displayed on the display unit 212, and the printer-URI of the other party to whom image transmission is desired is input from the operation unit 211.

  If the Printer-URI is not input in step S444, the image communication apparatus 108 recognizes that it is not a desired communication partner (FIG. 4B, step S430), and cancels the subsequent IPPFAX procedure (step S431). Returning to the call processing (step S409 in FIG. 4A).

  When the Printer-URI input is performed in step S444, the communication sequence of FIG. 3C is performed. That is, the DNS server 103 is searched from the input URI (FIG. 4B, step S451). When the IP address corresponding to the URI is obtained, the process proceeds to step S421 in FIG. 4B via step S440 in FIG. 4A, and image transmission / reception is performed by the above-described IPPFAX procedure.

  As described above, according to the present embodiment, the printer-URI is obtained using the IP address obtained from the SIP proxy service in the first communication session connected for the call, and the IP address is obtained in the second session. It is possible to perform image communication following a call (while calling) without going through a telephone call connection, that is, a SIP proxy service.

  According to the present embodiment, an image can be transmitted to a call partner very easily by simply inputting the other party's telephone number, starting a call, and then performing a predetermined operation, for example, by pressing the image communication key 211a.

  Also, in this embodiment, the correspondence information between the telephone number and IP address of the other party who has communicated in the past is cached in the memory, and the correspondence information in the memory is searched from the input telephone number before the call starts. Therefore, high-speed call connection can be performed (steps S408 and S402 in FIG. 4A).

  When image communication is performed after the call is started, the Printer-URI obtained from the SIP proxy service and the Printer-URI obtained from the IPPFAX protocol Get-Printer-Attributes Response are collated (FIG. 4 (b), step S427). Thus, whether or not the image transmission destination is correct can be confirmed, and if the two do not match, the Printer-URI of the desired image transmission destination can be manually input (step S444), and the reliability of image transmission can be improved. Can be increased.

  In the above, an example has been described in which a telephone call is made in the first communication session and image communication is performed in the second communication session after the call is made. Hereinafter, image communication is performed in the first communication session as shown in the second embodiment. It is also conceivable to make a call in the second communication session.

  It is assumed that the hardware configuration of this embodiment is the same as that shown in FIGS. 1, 2A, and 2B. In this embodiment, the call key 211b shown in FIG. 2B is used.

  The communication sequence of this embodiment and the control procedure of the image communication apparatus are shown in FIGS. 7 (a) to 7 (c), FIGS. 8 (a), 8 (b) and FIG. FIG. 7 corresponds to FIG. 3 in the first embodiment, and FIG. 8 corresponds to FIG. 4 in the first embodiment.

  7A shows a communication sequence when the image communication apparatus 105 makes a connection for the first time to the image communication apparatus 108, and FIGS. 7B and 7C show the image communication apparatus 105. FIG. This is a communication sequence when a call is made to the image communication apparatus 108 without performing a call connection again during image transmission.

  8A and 8B show a communication control procedure executed by the image communication apparatus 105, and FIG. 9 shows a communication control procedure executed by the image communication apparatus 108. 8 (a) and 8 (b), flows with the same alphabet are assumed to be continuous at that position. These communication procedures may be stored in the ROM 202 as a control program for the CPU 201.

  Since the communication control procedure of the SIP proxy 104 is the same as that in FIG. 6, it is omitted in this embodiment, but the communication control procedure of the SIP proxy 104 will be denoted by the reference numerals in FIG. 6 below.

  Hereinafter, when a call is made from the first image communication apparatus 105 to the second image communication apparatus 108, image communication is first performed in the first communication session, and then a call is started in the second communication session. The process will be described.

  When the image transmission key is pressed following the input of the destination telephone number by the key operation unit 211 of the image communication apparatus (FIG. 8A, step S1401), the IP address corresponding to this telephone number is stored in the memory. It is checked whether or not (step S1402). If the other party has already sent an image, an IP address corresponding to the telephone number is stored in a predetermined area of the memory (RAM 203) as described later.

  If the IP address corresponding to the telephone number is stored in the memory in step S1402, the process jumps to step S1440. If the IP address is not stored in the memory, the SIP service is used in steps S1404 to S1406. Get the IP address of the other station.

  In step S1404, a process of transmitting a SIP session request message (INVITE message) containing the telephone number information via the CSMA / CD interface 107 connected to the ADSL modem 106 in response to the telephone number input in the memory. This is performed (step S1404). This SIP message is configured in the following text format, as in the first embodiment.

INVITE sip: ezumi@canon.co.jp SIP / 2.0
Via: SIP / 2.0 / UDP soho.canon.co.jp
From: yosuke ezumi <ippfax: //ezumi.canon.co.jp>
To: <tel: 050-1234-5678>
Call-ID: 2ef-1737483932@soho.canon.co.jp
Cseq: 1 INVITE
Content Type: application / SDP
v = 0
o = mhandley 2890844526 2890842807 IN IP4 126.16.64.4
s = Image
t = 2873397496 2873404696
m = ippfax 44000 TCP
As described above, in the text following the header describing destination information based on the input telephone number, various parameters are described based on SDP (Session Description Protocol: RFC2327). In the case of image communication, the media type is an image (“s = Image” above) and a description about the type of image transmission protocol to be used can be described. In addition, the TCP port number used when transmitting / receiving the image packet can be described. In the above example, it is specified that IPPFAX is used as the transmission / reception protocol of the image packet, and that the 44000 port of TCP is used (described above). Part of "m = ippfax 44000 TCP").

  When transmitting this SIP message, UDP is used as a transport layer. For this reason, the CPU 201 adds a UDP header to the SIP message, generates a UDP frame, and stores it in the memory 203. The IP address 193.168.0.1 of the SIP proxy 104 is entered in the destination address in the UDP header, and 194.168.0.1 which is the IP address of the image communication apparatus 105 is entered in the source address. . Also, 5060, which is a SIP well-known port number, is entered as the destination port number, and an arbitrary port number (5000 in this example) is entered as the source port number.

  The CPU 201 transfers the UDP frame generated in this way to the LAN controller 216. When receiving the transmission data, the LAN controller 216 adds a MAC (Media Access Control) header and transmits the data to the ADSL modem 106, and the ADSL modem 106 that has received the data transmits the received data to the IP network 101. Various messages transmitted thereafter are also transmitted in the same procedure.

  In the case of this packet, since the IP address of the SIP proxy 104 is entered as the destination IP address, it is delivered to the SIP proxy 104 via the IP network 101 (step S601 in FIG. 6).

  The SIP proxy 104 expands the telephone number in the header of the received session request message into an address format such as “8.7.6.5.5.4.2.1.e164.arpa” (step S602). An inquiry is made to the ENUM server 102 (step S603). Upon receiving the inquiry, the ENUM server 102 searches for the URI corresponding to “8.7.6.5.5.4.2.1.e164.arpa”, for example, “ippfax: // canon. A URI such as “co.jp/abc” is returned to the SIP proxy 104.

  The SIP proxy 104 that has received the URI (step S604) inquires of the DNS server 103 about the IP address corresponding to the received URI “ipfax: //canon.co.jp/abc” (step S605). Upon receiving the inquiry, the DNS server 103 returns an IP address 197.168.0.1 corresponding to the image communication apparatus 108 corresponding to this URI to the SIP proxy 104.

  The SIP proxy 104 that has received the IP address of the partner image communication apparatus 108 from the DNS server (step S606), the image communication apparatus 108 that has received the transmission destination IP address in the packet received from the image communication apparatus 105 from the DNS server 103. And the source IP address is replaced with the IP address of the SIP proxy 104, and then a session request message is transmitted to the image communication apparatus 108 (step S607).

  On the other hand, the image communication apparatus 108 that has received the session request message (step S1501 in FIG. 9) transmits a calling message to the SIP proxy 104 (step S1502). The destination telephone number information described in the header of the received session request message is entered in the destination of the in-call message header, and the destination IP address is the source IP address of the session request message. Send the proxy 104 address. At this time, the SIP message (calling message) transmitted by the image communication apparatus 108 describes various parameters in the above SDP format as well as the session request message transmitted by the image communication apparatus 105, and is received by the image communication apparatus 108. The TCP port number for the image packet to be performed can also be specified. In this embodiment, the port number used by the image communication apparatus 108 for receiving image packets is 47000.

  In addition, the image communication apparatus 108 transmits a message during the call, and at the same time, the image communication apparatus 108 rings a ringing tone and displays that an image has been received (step S1503).

  The SIP proxy 104 that has received the in-call message (step S608) replaces the IP address of the image communication apparatus 105 with the destination IP address of the in-call message and replaces the IP address of the SIP proxy 104 with the IP address of the SIP proxy 104 for transmission. (Step S609), the image communication apparatus 105 receives the calling message (Step S1405 in FIG. 8).

  In this embodiment, it is assumed that the image communication apparatus 108 on the image receiving side performs a manual incoming call for image reception. When the image reception key (the image communication key 211a in the configuration of FIG. 2B may be used) is pressed in the key operation unit of the image communication apparatus 108 (step S1504), the image communication apparatus 108 is addressed to the SIP proxy 104. A response message is transmitted to (step S1505). If the image communication apparatus 108 is in the automatic reception mode, the response message transmission in step S1505 may be performed in response to the reception of the INVITE message (step S1501).

  When this response message is received (step S610 in FIG. 6), the SIP proxy 104 converts only the destination IP address to the IP address of the image communication apparatus 105 and transmits it (step S611), and the image communication apparatus 105 transmits the response message. (Step S1406 in FIG. 8A).

  The image communication apparatus 105 can recognize the IP address of the image communication apparatus 108 based on the transmission source IP address in the received response message (step S1407 in FIG. 8A). Thereafter, the image communication apparatus 105 does not pass through the SIP proxy 104. The packet can be transmitted directly to the image communication apparatus 108. In the image communication apparatus 105, the recognized IP address 197.168.0.1 is stored in the memory in association with the telephone number 050-1234-5678 (step S1408). In step S1440, whether or not it is the first communication session is determined as in the first embodiment, and if it is the second communication session, the process proceeds to step S1421 (FIG. 8B).

  The image communication apparatus 105 transmits a response confirmation message with the destination IP address as the IP address of the image communication apparatus 108, and the call connection procedure ends (step S1409).

  Through the above procedure, transmission / reception of image data can be started between the image communication apparatus 105 and the image communication apparatus 108.

  The sequence of image communication by the first session started in this way is shown in FIG. In this image transmission, since prevention of data errors is more important than real-time characteristics, TCP is used as a transport layer for image communication.

  Here, the image communication apparatus 105 transmits information such as transmission image parameters to the image communication apparatus 108 based on the IPPFAX protocol prior to image transmission. All IPPFAX messages are transmitted using HTTP POST. In addition, the destination port number in the IPPFAX message transmitted by the image communication apparatus 105 is 47100 and the transmission source port number is 44100 due to the message exchange described above, and the destination port number in the IPPFAX message transmitted by the image communication apparatus 108. 44100 and the source port number 47100 are selected.

  In image communication, the image communication apparatus 105 first transmits a Get-Printer-Attributes message (FIG. 8A, step S1410). The purpose of this message is to confirm with the image communication apparatus 108 the apparatus name, the document format that can be processed, and the like. The document format is described in the MIME (Multipurpose Internet Mail Extensions) format.

Details of the format of the Get-Printer-Attributes message are described in RFC 2911 and will not be described in detail here. However, in this embodiment, as in the first embodiment, the Get transmitted in step S1410 of FIG. -In the Printer-Attributes message-Check whether the image communication apparatus 108 supports reception / recording of JPEG images as a document format-Information for checking the Printer-URI of the image communication apparatus 108 shall be included. This is because when the image is transmitted to the other image communication apparatus without going through the SIP proxy, it is determined by the Printer-URI whether or not the other party is trying to transmit.

  The image communication apparatus 108 that has received the Get-Printer-Attributes message (step S1506 in FIG. 9) sends a Get-Printer-Attributes Response message to the image communication apparatus 105 that includes content indicating that a JPEG image is supported as a document format. Transmit (step S1507).

  When the image communication apparatus 105 receives the Get-Printer-Attributes Response message (step S1411 in FIG. 8A), the image communication apparatus 105 displays the printer-URI of the image communication apparatus 108 described in the Printer-URI in the message as the image communication. The information is stored in the memory in association with the telephone number of the device 108 (step S1412). Further, a Validate-Job message is transmitted to the image communication apparatus 108 in order to confirm whether or not image data can be transmitted (step S1413).

  When the image communication apparatus 108 receives the Validate-Job message and is ready to receive the message (step S1508 in FIG. 9), the image communication apparatus 108 transmits a Validate-Job Response message to the image communication apparatus 105 (step S1509).

  When the image communication apparatus 105 receives the Validate-Job Response message (step S1414 in FIG. 8A), the image communication apparatus 105 transmits a Print-Job message to transmit the JPEG image file. This Print-Job message includes the image file itself together with attribute information such as the URI of the transmission destination apparatus, the document name, and the document format.

  When generating the Print-Job message, the image communication apparatus 105 causes the CPU 201 to read out JPEG data stored in the memory card via the card interface 214 (FIG. 8A, step S1415). Subsequently, the CPU 201 performs BASE64 conversion processing on the read data, generates a frame to which each attribute of the Print-Job message and a TCP header including an IP address and a port number are added, and stores the frame in the RAM 203 (step S1416). Subsequently, this frame is transferred to the LAN controller 216, and the LAN controller 216 adds the MAC address and transmits it (step S1417).

  The image communication apparatus 108 that has received the Print-Job message (step S1510 in FIG. 9) can recognize that the received image file is a JPEG image by referring to the attribute information in the MIME header. In the image communication apparatus 108, the LAN controller 216 deletes the header and stores the JPEG data in the RAM 203 (step S1511).

  If the image communication apparatus 108 has successfully received the image data, the image communication apparatus 108 transmits a Print-Job Response message to that effect to the image communication apparatus 105, thereby ending the image communication operation (step S1512 in FIG. 9). In the image communication apparatus 108 that has received the JPEG image, the JPEG data is decompressed by the JPEG processing unit 212 (step S1513), and the recording processing unit 213 converts the decompressed image data into four-color data of CMKY (step S1514). The printer unit prints and outputs (step S1515).

  When the image communication apparatus 105 receives the Print-Job Response message (FIG. 8A, step S1418), it determines whether or not a call selection operation has been performed (FIG. 8A step S1441), and the call selection operation is performed. If yes, the process proceeds to step S1421 (FIG. 8B). If the call selection operation has not been performed, it is determined that the target image has been transmitted normally, and the image transmission operation is terminated (step S1419).

  In step S1441 in FIG. 8A, the call selection operation is determined whether or not a call selection operation such as off-hooking of the handset or pressing of the call key 211b of the operation unit 211 is performed during image communication in the image communication apparatus 105. Do this by examining. For example, when these call selection operations are performed during image communication, a flag is set, and the state of this flag may be checked in step S1441.

  If a call selection operation is detected in step S1441, the process proceeds to step S1421 in FIG. 8B to send a second session request for a call to the image communication partner 108. In this case, since the image communication apparatus 105 is already connected in the first session for image communication, the image communication apparatus 105 recognizes the IP address of the image communication apparatus 108. That is, in step S1402, since the IP address corresponding to the telephone number is stored in the memory, the image communication apparatus 105 has the IP address of the destination image communication apparatus 108 of 197.168.0.1 (the address in FIG. 1). It is possible to recognize that this is the case (FIG. 8B, step S1421).

  Therefore, in order to make the second communication session request, the IP address 197.168.0.1 is added to the INVITE message and directly transmitted to the image communication apparatus 108 (step S1422). The contents of the session request message are the same as those described above.

  Thereafter, as shown in FIG. 7B, a calling message, a response message, and a response confirmation message are transmitted and received between the image communication apparatus 105 and the image communication apparatus 108 (step S1423). The difference from the case where the IP address is not stored in the memory (for example, the first session described above) is that transmission / reception of these messages does not pass through the SIP proxy 104 but directly between the image communication apparatus 105 and the image communication apparatus 108. , Is the point that is sent and received.

  Subsequent to the transmission / reception of these messages, the image communication apparatus 108 detects the incoming second session for the call (step S1520 in FIG. 9) and responds (step S1521), thereby making a call with the image communication apparatus 105 for the call. The connection is established, and the devices that are performing image communication can establish a connection for a call, and can perform a call (step S1442 in FIG. 8B and step S1521 in FIG. 9).

  The end of the call ends when the image terminals 105 and 108 detect the end of the call (FIG. 8B, step S1443, FIG. 9 step S1522). Thereby, the second session for a call started during the image communication is ended.

  In addition, the calling message, the response message, and the response confirmation message are transmitted and received between the image communication apparatus 105 and the image communication apparatus 108 (steps S1422 and S1423). However, the transmission and reception are not normally performed for some reason. If this happens, the following operation is performed. The communication sequence at this time is shown in FIG.

  That is, if transmission / reception of the response confirmation message is not normally performed in step S1423, an IP phone for performing call connection via SIP proxy to a desired call partner by key operation of operation unit 211 in step S1444. The number is manually input, and thereafter, the process proceeds to step S1404 in FIG. If no IP phone number has been entered, the process proceeds to step S1430.

  When the IP telephone number is input, in step S1404 in FIG. 8A, an INVITE message is transmitted via the SIP proxy 104. Subsequently, it is recognized in step S1440 that the call is the second session, and image communication is performed. The IP address of the device 108 is recognized (step S1421 in FIG. 8B), and an INVITE message is transmitted using this address (steps S1422 and S1423). Thereafter, in the same manner as described above, call processing is performed after step S1424.

  On the other hand, if the IP telephone number is not input in step S1444 of FIG. 8B, it is recognized in step S1430 that the connection partner is not the desired call partner (step S1430), and the subsequent call procedure is canceled (step S1430). Step S1431).

  As described above, image communication can be performed in the first communication session and a call can be performed in the second communication session.

  According to the present embodiment, the IP address obtained from the SIP proxy service is used in the first communication session connected for image communication, and the IP session is connected via the IP telephone call connection, that is, the SIP proxy service in the second session. Without making a call, it is possible to make a call following the image communication.

  According to the present embodiment, the other party's telephone number is input, image communication is started, and then a predetermined operation is performed, for example, the telephone key 211b is pressed or the handset is off-hooked to start the telephone call very easily. Can do.

  Also in the present embodiment, as in the first embodiment, the correspondence information between the telephone number and IP address of the other party who has communicated in the past is cached in the memory, and the correspondence information in the memory is searched from the input telephone number before the call is started. For example, since the communication is started using the information, high-speed call connection can be performed (steps S1408 and S1402 in FIG. 8A).

  In the first and second embodiments, IPPFAX is exemplified as the image transmission protocol. However, by using any other IP communication / file transfer protocol such as FTP, HTTP, RCP, and IPPFAX, Needless to say, similar effects can be obtained.

  In the first and second embodiments described above, it is considered that the image communication device 105 transmits the JPEG image data of the memory card to the image communication device 108. However, the image read by the CIS 204 is MH-encoded. It goes without saying that the same effect can be obtained when transmitting the data.

  The present invention can be applied to a communication device that performs voice communication and image communication via an IP network. Such a communication device can be configured as a dedicated machine, and can also be used as an image input / output device such as a scanner or a camera interface. And hardware such as a PC (personal computer) having a network interface. In particular, when using such PC hardware, the method or program of the present invention can be introduced into the PC hardware via an appropriate storage medium or via a network.

1 is a block diagram showing a configuration of a network system including an image communication apparatus adopting the present invention. It is the block diagram which showed the internal structure of the image communication apparatus which employ | adopted this invention. It is the block diagram which showed the external structure of the image communication apparatus which employ | adopted this invention. FIG. 3 is an explanatory diagram showing a communication sequence when a call is made by making a call connection from the image communication apparatus 105 of FIG. 1 to the image communication apparatus 108 (Example 1). (Example 1) which is the explanatory diagram which showed the communication sequence of the image communication started from the telephone call of Fig.3 (a). (Example 1) which is the explanatory diagram which showed the communication sequence of the image communication started from the telephone call of Fig.3 (a). FIG. 3 is a flowchart illustrating communication control of the image communication apparatus 105 in FIG. 1 (Example 1). FIG. 3 is a flowchart illustrating communication control of the image communication apparatus 105 in FIG. 1 (Example 1). FIG. 3 is a flowchart illustrating communication control of the image communication apparatus 105 in FIG. 1 (Example 1). FIG. 3 is a flowchart illustrating a communication control procedure executed by the image communication apparatus of FIG. 1 (Example 1). FIG. 3 is a flowchart showing communication control of the SIP proxy of FIG. 1 (Example 1, Example 2). FIG. 10 is an explanatory diagram showing a communication sequence when performing image communication by making a call connection from the image communication apparatus 105 of FIG. 1 to the image communication apparatus (Example 2). (Example 2) which is the explanatory diagram which showed the communication sequence of the telephone call started from the image communication of Fig.7 (a). (Example 2) which is the explanatory diagram which showed the communication sequence of the telephone call started from the image communication of Fig.7 (a). FIG. 6 is a flowchart illustrating communication control of the image communication apparatus 105 in FIG. 1 (Example 2). FIG. 6 is a flowchart illustrating communication control of the image communication apparatus 105 in FIG. 1 (Example 2). FIG. 9 is a flowchart illustrating a communication control procedure executed by the image communication apparatus in FIG. 1 (second embodiment).

Explanation of symbols

102 ENUM Server 103 DNS Server 104 SIP Proxy 105 Image Communication Device 106, 109 ADSL Modem 107, 110 CSMA / CD Interface 108 Image Communication Device 204 CIS
205 Reading Control Unit 207 FAX Modem 208 Voice Input / Output Unit 210 CODEC
211a Image communication key 211b Call key 212 Liquid crystal display unit 213 Recording processing unit 214 Card interface 216 LAN controller

Claims (18)

In a communication apparatus that has voice input / output means for voice communication and image input means for inputting an image to be transmitted, and performs voice communication and image communication via an IP network,
IP address acquisition means for acquiring the IP address of the partner communication device using the SIP service;
In the first communication session after the call is made, the IP address acquisition unit is used to acquire the IP address of the partner communication device, voice communication or image communication is performed, and in the subsequent second communication session, the IP address acquisition unit is used. A communication apparatus comprising communication control means for performing image communication or voice communication by connecting to a partner communication apparatus using the IP address of the partner communication apparatus acquired in the first communication session without using it.   The communication apparatus according to claim 1, wherein the communication apparatus shifts to the second communication session in response to a predetermined user operation performed in the first communication session.   The communication apparatus according to claim 2, wherein the predetermined user operation is an operation of a predetermined operation key.   The predetermined user operation for performing image communication in the first communication session and shifting to the second communication session performed during the image communication is an off-hook of a handset provided as the voice input / output unit. The communication device according to claim 2.   In the second communication session, when the IP address of the partner communication device acquired in the first communication session is unusable, connection information of the partner communication device to perform image communication or voice communication in the second communication session The communication apparatus according to claim 1, wherein the user is manually input.   The communication apparatus according to claim 5, wherein a user manually inputs any one of a URI, an IP address, and an IP telephone number as the connection information. In a control method of a communication apparatus having a voice input / output means for voice communication and an image input means for inputting an image to be transmitted, and performing voice communication and image communication via an IP network,
In the first communication session after the call is made, the SIP service is used to acquire the IP address of the partner communication device, voice communication or image communication is performed, and then the second communication session is performed without using the SIP service. A control method for a communication device, characterized in that image communication or voice communication is performed by connecting to the partner communication device using the IP address of the partner communication device acquired in one communication session.   8. The method of controlling a communication apparatus according to claim 7, wherein the communication apparatus shifts to the second communication session in response to a predetermined user operation performed in the first communication session.   The communication apparatus control method according to claim 8, wherein the predetermined user operation is an operation of a predetermined operation key.   The predetermined user operation for performing image communication in the first communication session and shifting to the second communication session performed during the image communication is an off-hook of a handset provided as a voice input / output unit. The method for controlling a communication apparatus according to claim 8.   In the second communication session, when the IP address of the partner communication device acquired in the first communication session is unusable, connection information of the partner communication device to perform image communication or voice communication in the second communication session 8. The method of controlling a communication device according to claim 7, wherein the user is manually input.   12. The method of controlling a communication apparatus according to claim 11, wherein a user manually inputs any one of a URI, an IP address, or an IP telephone number as the connection information. In a control program for a communication apparatus having a voice input / output means for voice communication and an image input means for inputting an image to be transmitted, and performing voice communication and image communication via an IP network,
In the first communication session after the call is made, the SIP service is used to acquire the IP address of the partner communication device, voice communication or image communication is performed, and then the second communication session is performed without using the SIP service. A control program for a communication apparatus, comprising: a control process for performing image communication or voice communication by connecting to a partner communication apparatus using the IP address of the partner communication apparatus acquired in one communication session.   14. The control program for a communication apparatus according to claim 13, further comprising a control process for shifting to the second communication session in response to a predetermined user operation performed in the first communication session.   15. The control program for a communication apparatus according to claim 14, further comprising a control process for detecting an operation of a predetermined operation key as the predetermined user operation.   Image communication is performed in the first communication session, and an off-hook of a handset provided as voice input / output means is detected as the predetermined user operation for shifting to the second communication session performed during the image communication. The communication apparatus control program according to claim 14, further comprising a control process for the communication apparatus.   In the second communication session, when the IP address of the partner communication device acquired in the first communication session is unusable, connection information of the partner communication device to perform image communication or voice communication in the second communication session 14. The control program for a communication apparatus according to claim 13, further comprising a control process for allowing a user to manually input a password.   18. The control program for a communication apparatus according to claim 17, further comprising a control process for allowing a user to manually input any one of a URI, an IP address, or an IP telephone number as the connection information.

Images